1. 11 January 2011 Geant4 Visualization Commands J. Perl 1 DAWN OpenGL Geant4 Visualization Commands Basic Visualization Commands Makoto Asai (SLAC) slides created by Joseph Perl (SLAC) HepRep/HepRApp Geant4 v9.5

2. 11 January 2011 2Geant4 Visualization Commands J. Perl How this Document Fits with Other Tutorial Materials This presentation can be used on its own, but gives the most comprehensive introduction to Geant4 visualization when used as part of the following full set of documents: This presentation can be used on its own, but gives the most comprehensive introduction to Geant4 visualization when used as part of the following full set of documents: Introduction to Geant4 Visualization Introduction to Geant4 Visualization Introduction to Geant4 Visualization Introduction to Geant4 Visualization Geant4 Installation Guides Geant4 Installation Guides Geant4 Installation Guides Geant4 Installation Guides Geant4 Visualization Tutorial using the HepRApp HepRep Browser Geant4 Visualization Tutorial using the HepRApp HepRep Browser Geant4 Visualization Tutorial using the HepRApp HepRep Browser Geant4 Visualization Tutorial using the HepRApp HepRep Browser Geant4 Visualization Tutorial using the DAWN Event Display Geant4 Visualization Tutorial using the DAWN Event Display Geant4 Visualization Tutorial using the DAWN Event Display Geant4 Visualization Tutorial using the DAWN Event Display Geant4 Visualization Tutorial using the OpenGL Event Display Geant4 Visualization Tutorial using the OpenGL Event Display Geant4 Visualization Tutorial using the OpenGL Event Display Geant4 Visualization Tutorial using the OpenGL Event Display Geant4 Visualization Commands Geant4 Visualization Commands Geant4 Visualization Commands Geant4 Visualization Commands Geant4 Advanced Visualization Geant4 Advanced Visualization Geant4 Advanced Visualization Geant4 Advanced Visualization See the URLS at the end of this presentation See the URLS at the end of this presentation

3. 11 January 2011 3Geant4 Visualization Commands J. Perl What’s in this Presentation This presentation covers the most basic commands for Geant Visualization (plus a few interesting small digressions) This presentation covers the most basic commands for Geant Visualization (plus a few interesting small digressions) Further presentations cover more advanced topics (see references at the end of this presentation) Further presentations cover more advanced topics (see references at the end of this presentation) Geant4 Advanced Visualization: Geant4 Advanced Visualization: Visualization Attributes Visualization Attributes to control color, line style, etc. to control color, line style, etc. to represent particle type, charge, etc. to represent particle type, charge, etc. Trajectory Modeling Trajectory Modeling Advanced Trajectory Modeling Advanced Trajectory Modeling Trajectory and Hit Filtering Trajectory and Hit Filtering Controlling level of detail in geometry Controlling level of detail in geometry Section planes Section planes Reviewing kept events Reviewing kept events Standalone visualization Standalone visualization How to Make a Movie How to Make a Movie

4. 11 January 2011 4Geant4 Visualization Commands J. Perl Simplest Example Visualize your geometry in OpenGL: Visualize your geometry in OpenGL: /vis/open OGL /vis/open OGL /vis/drawVolume /vis/drawVolume

5. 11 January 2011 5Geant4 Visualization Commands J. Perl # Use this open statement to create an OpenGL view: /vis/open OGL 600x600-0+0 # # Use this open statement to create a.prim file suitable for viewing in DAWN: #/vis/open DAWNFILE # # Use this open statement to create a.heprep file suitable for viewing in HepRApp: #/vis/open HepRepFile # # Use this open statement to create a.wrl file suitable for viewing in a VRML viewer: #/vis/open VRML2FILE # # Disable auto refresh and quieten vis messages whilst scene and trajectories are established: /vis/viewer/set/autoRefresh false /vis/verbose errors # # Draw geometry: /vis/drawVolume Most examples will come with a visualization macro as follows (1 of 3)

6. 11 January 2011 6Geant4 Visualization Commands J. Perl # Specify view angle: #/vis/viewer/set/viewpointThetaPhi 90. 0. # # Specify zoom value: #/vis/viewer/zoom 2. # # Specify style (surface or wireframe): #/vis/viewer/set/style wireframe # # Draw coordinate axes: #/vis/scene/add/axes 0 0 0 1 m # # Draw smooth trajectories at end of event, showing trajectory points as markers 2 pixels wide: /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 # (if too many tracks cause core dump => /tracking/storeTrajectory 0) # # Draw hits at end of event: #/vis/scene/add/hits Most examples will come with a visualization macro as follows (2 of 3)

7. 11 January 2011 7Geant4 Visualization Commands J. Perl # # To draw only gammas: #/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma # # To invert the above, drawing all particles except gammas, keep the above two lines but also add: #/vis/filtering/trajectories/particleFilter-0/invert true # # Many other options are available with /vis/modeling and /vis/filtering. # For example, to select colour by particle ID: #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue # # To superimpose all of the events from a given run: #/vis/scene/endOfEventAction accumulate # # Re-establish auto refreshing and verbosity: /vis/viewer/set/autoRefresh true /vis/verbose warnings # # For file-based drivers, use this to create an empty detector view: #/vis/viewer/flush Most examples will come with a visualization macro as follows (3 of 3)

8. 11 January 2011 8Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume #/vis/viewer/set/viewpointThetaPhi 90. 0. #/vis/viewer/zoom 2. #/vis/viewer/set/style wireframe #/vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 #/vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Here’s that long macro with the comments removed. I’ll cover all of this commands in this presentation.

9. 11 January 2011 9Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume #/vis/viewer/set/viewpointThetaPhi 90. 0. #/vis/viewer/zoom 2. #/vis/viewer/set/style wireframe #/vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 #/vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Simplest Command Sequence

10. 11 January 2011 10Geant4 Visualization Commands J. Perl To Open Visualization To Open a Driver To Open a Driver /vis/open /vis/open for example for example /vis/open OGL /vis/open OGL /vis/open DAWNFILE /vis/open DAWNFILE /vis/open HepRepFile /vis/open HepRepFile /vis/open VRML2FILE /vis/open VRML2FILE The set of available drivers is listed when you first start Geant4, but you can also get this list with the command: The set of available drivers is listed when you first start Geant4, but you can also get this list with the command: help /vis/open help /vis/open For the OpenGL drivers, there are options with very slightly different behavior: For the OpenGL drivers, there are options with very slightly different behavior: OGLS: use OpenGL’s “Stored” mode. OGLS: use OpenGL’s “Stored” mode. OGLI: use OpenGL’s “Immediate” mode. OGLI: use OpenGL’s “Immediate” mode. OGL: same as OGLS unless starts using too much memory, then switches to OGLI OGL: same as OGLS unless starts using too much memory, then switches to OGLI Most users will not notice any difference. It has to do with whether Geant4 needs to resend all of the graphics information to the OpenGL driver for every new picture (Immediate mode) or can just send the new parts of the picture, getting the rest from storage already in the OpenGL driver (Stored mode). Most users will not notice any difference. It has to do with whether Geant4 needs to resend all of the graphics information to the OpenGL driver for every new picture (Immediate mode) or can just send the new parts of the picture, getting the rest from storage already in the OpenGL driver (Stored mode). And if you have Qt or Motif libraries installed and configured, OGL will use these. And if you have Qt or Motif libraries installed and configured, OGL will use these. Don’t worry about this for now, but if you have problems with one mode, try the other. Don’t worry about this for now, but if you have problems with one mode, try the other.

11. 11 January 2011 11Geant4 Visualization Commands J. Perl More about Open, and about DrawVolume Some drivers have additional options at open Some drivers have additional options at open e.g., for OpenGL, can specify size and location of window /vis/open OGL 600x600-0+0 e.g., for OpenGL, can specify size and location of window /vis/open OGL 600x600-0+0 You can open more than one viewer at a time: You can open more than one viewer at a time: /vis/open OGL /vis/open OGL /vis/open HepRepFile /vis/open HepRepFile To see what viewers you then have: To see what viewers you then have: /vis/viewer/list /vis/viewer/list To select which viewer is the current one: To select which viewer is the current one: /vis/viewer/select viewer-0 /vis/viewer/select viewer-0 /vis/viewer/select viewer-1 /vis/viewer/select viewer-1 All other vis commands affect only the currently selected viewer All other vis commands affect only the currently selected viewer To draw the entire detector geometry: To draw the entire detector geometry: /vis/drawVolume /vis/drawVolume There are many additional options to let you draw only a selected subset of the detector geometry. There are many additional options to let you draw only a selected subset of the detector geometry. See separate presentation, Geant4 Advanced Visualization See separate presentation, Geant4 Advanced Visualization

12. 11 January 2011 12Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume #/vis/viewer/set/viewpointThetaPhi 90. 0. #/vis/viewer/zoom 2. #/vis/viewer/set/style wireframe #/vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 #/vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

13. 11 January 2011 13Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe #/vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 #/vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Controlling the viewpoint and zoom

14. 11 January 2011 14Geant4 Visualization Commands J. Perl The /vis/viewer/… Commands Only needed if using an immediate viewer, such as OpenGL For HepRepFile or DAWNFILE, these sorts of adjustments are made later, in the HepRApp or DAWN viewer programs Set view angles /vis/viewer/set/viewpointThetaPhi for example /vis/viewer/set/viewpointThetaPhi 90. 0. Zoom /vis/viewer/zoom for example /vis/viewer/zoom 2. Reset viewpoint /vis/viewer/reset Set drawing style /vis/viewer/set/style for example /vis/viewer/set/style wireframe /vis/viewer/set/style surface but note that this will not affect volumes that have style explicitly forced by “setForceWireframe” or “setForceSolid” commands in the c++ code

15. 11 January 2011 15Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe #/vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 #/vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

16. 11 January 2011 16Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Add axes, trajectories and hits

17. 11 January 2011 17Geant4 Visualization Commands J. Perl Axes, Trajectories and Hits Axes Axes /vis/scene/add/axes /vis/scene/add/axes for example for example /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/axes 0 0 0 1 m Trajectories Trajectories /vis/scene/add/trajectories /vis/scene/add/trajectories By default, trajectories are redrawn at every event By default, trajectories are redrawn at every event /run/beamOn 1 /run/beamOn 1 Hits Hits /vis/scene/add/hits /vis/scene/add/hits Note that not all examples contain code to create hits, so in some cases this command will add nothing to the display Note that not all examples contain code to create hits, so in some cases this command will add nothing to the display

18. 11 January 2011 18Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

19. 11 January 2011 19Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Visualizing step points

20. 11 January 2011 20Geant4 Visualization Commands J. Perl Visualizing Step Points By default, the trajectory is drawn just as a line By default, the trajectory is drawn just as a line To also show the step points: To also show the step points: /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 This syntax is complicated because it actually supports many more options on how trajectories and step points should be modeled. This syntax is complicated because it actually supports many more options on how trajectories and step points should be modeled. See separate presentation, Geant4 Advanced Visualization See separate presentation, Geant4 Advanced Visualization Trajectories and step points can contain additional, non-displayed information Trajectories and step points can contain additional, non-displayed information such as particle id, momentum, etc. such as particle id, momentum, etc. shown when you pick on the trajectory in some visualization drivers. shown when you pick on the trajectory in some visualization drivers. This set of information can be made richer by specifying rich trajectories: This set of information can be made richer by specifying rich trajectories: /vis/scene/add/trajectories rich /vis/scene/add/trajectories rich

21. 11 January 2011 21Geant4 Visualization Commands J. Perl Rich Trajectory Has Details on Every Step Point

22. 11 January 2011 22Geant4 Visualization Commands J. Perl Rich Trajectory and Points G4RichTrajectory: Extra: Extra: Creator Process Name Creator Process Name Creator Process Type Name Creator Process Type Name Charge (Ch): unit: e+ Charge (Ch): unit: e+ Ending Process Name Ending Process Name Ending Process Type Name Ending Process Type Name Final kinetic energy Final kinetic energy Final Next Volume Path Final Next Volume Path Final Volume Path Final Volume Path Already in regular Trajectory: Already in regular Trajectory: Track ID Track ID Initial kinetic energy Initial kinetic energy Initial momentum magnitude Initial momentum magnitude Initial momentum Initial momentum Initial Next Volume Path Initial Next Volume Path Initial Volume Path Initial Volume Path No. of points No. of points PDG Encoding PDG Encoding Parent ID Parent ID Particle Name Particle Name G4RichTrajectoryPoint: Extra: Extra: Auxiliary Point Position Auxiliary Point Position Process Defined Step Process Defined Step Process Type Defined Process Type Defined Position Position Post-step-point global time Post-step-point global time Post-step Volume Path Post-step Volume Path Pre-step-point global time Pre-step-point global time Pre-step Volume Path Pre-step Volume Path Remaining Energy Remaining Energy Total Energy Deposit Total Energy Deposit Already in regular TrajectoryPoint Already in regular TrajectoryPoint nothing is included by default nothing is included by default

23. 11 January 2011 23Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true #/vis/modeling/trajectories/create/drawByParticleID #/vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

24. 11 January 2011 24Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Smooth Trajectories

25. 11 January 2011 25Geant4 Visualization Commands J. Perl Regular versus Smooth Trajectory Yellow are the actual step points used by Geant4 Magenta are auxiliary points added just for purposes of visualization

26. 11 January 2011 26Geant4 Visualization Commands J. Perl Smooth Trajectories By default, the trajectory is represented as a series of line segments from one step point to the next. By default, the trajectory is represented as a series of line segments from one step point to the next. For the case of strong fields, this may result in jagged looking tracks. For the case of strong fields, this may result in jagged looking tracks. Can ask visualization to smooth the lines with: Can ask visualization to smooth the lines with: /vis/scene/add/trajectories smooth /vis/scene/add/trajectories smooth The extra points are not actual Geant4 step points. Smooth does not change how Geant4 actually does its stepping. These extra “auxiliary points” are only added to make a smoother line. The extra points are not actual Geant4 step points. Smooth does not change how Geant4 actually does its stepping. These extra “auxiliary points” are only added to make a smoother line. Trajectories can be smooth, rich or both: Trajectories can be smooth, rich or both: /vis/scene/add/trajectories smooth rich /vis/scene/add/trajectories smooth rich We’ll cover more details on this in a later presentation We’ll cover more details on this in a later presentation

27. 11 January 2011 27Geant4 Visualization Commands J. Perl Smooth Trajectory Makes Big Difference for Trajectories that Loop in a Magnetic Field Yellow dots are the actual step points used by Geant4 Magenta dots are auxiliary points added just for purposes of visualization

28. 11 January 2011 28Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

29. 11 January 2011 29Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue #/vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Basic trajectory modeling

30. 11 January 2011 30Geant4 Visualization Commands J. Perl Basic Trajectory Modeling By default, trajectories are color-coded by charge positive = blue neutral = green negative = red But you can choose other modeling options, such as color by particle ID /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/modeling/trajectories/drawByParticleID-0/set e- blue Right now, when you first turn on drawByParticleID, all particles are set to grey, and you then have to assign any colors you want. Starting in the next release, the default will be to already assign some color codes (which you can then override if you want to). The new defaults will be equivalent to: /vis/modeling/trajectories/drawByParticleID-0/set e- red /vis/modeling/trajectories/drawByParticleID-0/set e- red /vis/modeling/trajectories/drawByParticleID-0/set e+ blue /vis/modeling/trajectories/drawByParticleID-0/set e+ blue /vis/modeling/trajectories/drawByParticleID-0/set proton cyan /vis/modeling/trajectories/drawByParticleID-0/set proton cyan /vis/modeling/trajectories/drawByParticleID-0/set gamma green /vis/modeling/trajectories/drawByParticleID-0/set gamma green /vis/modeling/trajectories/drawByParticleID-0/set neutron yellow /vis/modeling/trajectories/drawByParticleID-0/set neutron yellow /vis/modeling/trajectories/drawByParticleID-0/set pi+ magenta /vis/modeling/trajectories/drawByParticleID-0/set pi+ magenta /vis/modeling/trajectories/drawByParticleID-0/set pi- magenta /vis/modeling/trajectories/drawByParticleID-0/set pi- magenta /vis/modeling/trajectories/drawByParticleID-0/set pi0 magenta /vis/modeling/trajectories/drawByParticleID-0/set pi0 magenta # and everything else still grey # and everything else still grey

31. 11 January 2011 31Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

32. 11 January 2011 32Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Accumulating trajectories and hits

33. 11 January 2011 33Geant4 Visualization Commands J. Perl Accumulating Trajectories and Hits By default, you will get a drawing after each event. To instead get just one drawing with all of the accumulated events from that run By default, you will get a drawing after each event. To instead get just one drawing with all of the accumulated events from that run /vis/scene/endOfEventAction accumulate /vis/scene/endOfEventAction accumulate This overrides the default This overrides the default /vis/scene/endOfEventAction refresh /vis/scene/endOfEventAction refresh To even suppress that one drawing from the end of the /run/beamOn, use To even suppress that one drawing from the end of the /run/beamOn, use /vis/scene/endOfRunAction accumulate /vis/scene/endOfRunAction accumulate This overrides the default This overrides the default /vis/scene/endOfRunAction refresh /vis/scene/endOfRunAction refresh When you actually want to draw, you then have to explicitly issue the command When you actually want to draw, you then have to explicitly issue the command /vis/viewer/flush /vis/viewer/flush

34. 11 January 2011 34Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits#/vis/filtering/trajectories/create/particleFilter #/vis/filtering/trajectories/particleFilter-0/add gamma #/vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

35. 11 January 2011 35Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush Filtering Trajectories

36. 11 January 2011 36Geant4 Visualization Commands J. Perl Filtering Trajectories By default, all trajectories are drawn By default, all trajectories are drawn You apply a filter so that only certain trajectories are drawn: You apply a filter so that only certain trajectories are drawn: /vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/add gamma The above adds a filter that only allows gammas to draw The above adds a filter that only allows gammas to draw To instead do the opposite, drawing everying except gammas, include the above, but also add the following: To instead do the opposite, drawing everying except gammas, include the above, but also add the following: /vis/filtering/trajectories/particleFilter-0/invert true /vis/filtering/trajectories/particleFilter-0/invert true We’ll cover more details on this in a later presentation (including how to filter hits) We’ll cover more details on this in a later presentation (including how to filter hits)

37. 11 January 2011 37Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

38. 11 January 2011 38Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings /vis/viewer/flush To force output of a new file

39. 11 January 2011 39Geant4 Visualization Commands J. Perl To Force Output of a New File There are two classes of Geant4 visualization drivers: There are two classes of Geant4 visualization drivers: Immediate drivers: draw directly to the screen (such as OpenGL) Immediate drivers: draw directly to the screen (such as OpenGL) File-based drivers: create a file on disk (HepRepFile, VRML2FILE) File-based drivers: create a file on disk (HepRepFile, VRML2FILE) You open this file later in that separate application You open this file later in that separate application For immediate drivers For immediate drivers you see the results or your /vis commands immediately you see the results or your /vis commands immediately For the file-based drivers For the file-based drivers the default is to only create a new file (showing your changes) when you do /run/beamOn the default is to only create a new file (showing your changes) when you do /run/beamOn If you want to see visualization at some other time, such as after you set up geometry, but before you do /run/beamOn, use: If you want to see visualization at some other time, such as after you set up geometry, but before you do /run/beamOn, use: /vis/viewer/flush /vis/viewer/flush

40. 11 January 2011 40Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings /vis/viewer/flush What we’ve covered so far

41. 11 January 2011 41Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush To avoid excessive redrawing on immediate viewers

42. 11 January 2011 42Geant4 Visualization Commands J. Perl To Avoid Excessive Redrawing By default, immediate viewers will redraw after every vis command that might change the view, such as: By default, immediate viewers will redraw after every vis command that might change the view, such as: /vis/drawVolume /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/axes 0 0 0 1 m If the geometry is very complex (such as in some imported patient geometries for medical applications), this can result in slow performance If the geometry is very complex (such as in some imported patient geometries for medical applications), this can result in slow performance the above would redraw five times the above would redraw five times To temporarily turn off this redrawing: To temporarily turn off this redrawing: /vis/viewer/set/autoRefresh false /vis/viewer/set/autoRefresh false And then once everything is set up: And then once everything is set up: /vis/viewer/set/autoRefresh true /vis/viewer/set/autoRefresh true Note that there is no need for a /vis/viewer/flush at that point, since the autoRefresh true will trigger a redraw Note that there is no need for a /vis/viewer/flush at that point, since the autoRefresh true will trigger a redraw

43. 11 January 2011 43Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush What we’ve covered so far

44. 11 January 2011 44Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush To turn off unwanted visualization messages on the console

45. 11 January 2011 45Geant4 Visualization Commands J. Perl To Turn off Unwanted Visualization Messages You can control how many messages visualization puts on the console by: You can control how many messages visualization puts on the console by: /vis/verbose /vis/verbose 0) quiet, // Nothing is printed. 1) startup, // Startup and endup messages are printed... 2) errors, //...and errors... 3) warnings, //...and warnings... 4) confirmations, //...and confirming messages... 5) parameters, //...and parameters of scenes and views... 6) all //...and everything available.

46. 11 January 2011 46Geant4 Visualization Commands J. Perl /vis/open OGL 600x600-0+0 #/vis/open DAWNFILE #/vis/open HepRepFile #/vis/open VRML2FILE /vis/viewer/set/autoRefresh false /vis/verbose errors /vis/drawVolume /vis/viewer/set/viewpointThetaPhi 90. 0. /vis/viewer/zoom 2. /vis/viewer/set/style wireframe /vis/scene/add/axes 0 0 0 1 m /vis/scene/add/trajectories smooth /vis/modeling/trajectories/create/drawByCharge /vis/modeling/trajectories/drawByCharge-0/default/setDrawStepPts true /vis/modeling/trajectories/drawByCharge-0/default/setStepPtsSize 2 /vis/scene/add/hits/vis/filtering/trajectories/create/particleFilter /vis/filtering/trajectories/particleFilter-0/add gamma /vis/filtering/trajectories/particleFilter-0/invert true /vis/modeling/trajectories/create/drawByParticleID /vis/modeling/trajectories/drawByParticleID-0/set e- blue /vis/scene/endOfEventAction accumulate /vis/viewer/set/autoRefresh true /vis/verbose warnings #/vis/viewer/flush We’ve covered all of it Now on to some extra topics

47. 11 January 2011 47Geant4 Visualization Commands J. Perl Printing from OpenGL Each of the visualization drivers provides its own way to print files. Each of the visualization drivers provides its own way to print files. RayTracer directly produces a gif file RayTracer directly produces a gif file OpenInventor, HepRep, DAWN and VRML rely on external application to provide a rich set of printing options OpenInventor, HepRep, DAWN and VRML rely on external application to provide a rich set of printing options OpenGL printing is less obvious but quite powerful OpenGL printing is less obvious but quite powerful The OpenGL drivers can directly produce PostScript graphics The OpenGL drivers can directly produce PostScript graphics Options for both Vector and Bitmapped Options for both Vector and Bitmapped Open your GL viewer and set up the view as usual Open your GL viewer and set up the view as usual /vis/open OGL /vis/open OGL /vis/drawVolume /vis/drawVolume /vis/viewer/zoom 2. /vis/viewer/zoom 2. /vis/viewer/set/viewpointThetaPhi 30. 30. /vis/viewer/set/viewpointThetaPhi 30. 30. Then print Then print /vis/ogl/printEPS /vis/ogl/printEPS Extra options allows you to control output style and transparency Extra options allows you to control output style and transparency /vis/ogl/set/printMode vectored or pixmap /vis/ogl/set/printMode vectored or pixmap /vis/ogl/set/transparency True or False /vis/ogl/set/transparency True or False

48. 11 January 2011 48Geant4 Visualization Commands J. Perl Hidden Line Removal OpenGL supports hidden line removal. OpenGL supports hidden line removal. You can control whether this removal is done and whether trajectories and hits are affected by this feature. You can control whether this removal is done and whether trajectories and hits are affected by this feature. By default, hidden line removal is disabled By default, hidden line removal is disabled To turn on hidden line removal To turn on hidden line removal /vis/viewer/set/hiddenEdge 1 /vis/viewer/set/hiddenEdge 1 This hides edges of geometry, but lets trajectories through. This hides edges of geometry, but lets trajectories through. To hide trajectories and hits as well To hide trajectories and hits as well /vis/viewer/set/hiddenMarker 1 /vis/viewer/set/hiddenMarker 1

49. 11 January 2011 49Geant4 Visualization Commands J. Perl Transfer View Settings Between Views You can transfer the view settings from one viewer to another. You can transfer the view settings from one viewer to another. Allows you to use a fast viewer to select a special view, then tell a slower viewer to render this same view Allows you to use a fast viewer to select a special view, then tell a slower viewer to render this same view For example, set up a view in OpenGL For example, set up a view in OpenGL /vis/open OGL /vis/open OGL by default, it will give this new viewer the name “viewer-0” by default, it will give this new viewer the name “viewer-0” /vis/drawVolume /vis/drawVolume Try a few values for zoom to find one that looks good Try a few values for zoom to find one that looks good /vis/viewer/zoom 2. /vis/viewer/zoom 2. /vis/viewer/zoom 1.2 /vis/viewer/zoom 1.2 Try a few view angles to find one that looks good Try a few view angles to find one that looks good /vis/viewer/set/viewpointThetaPhi 30. 30. /vis/viewer/set/viewpointThetaPhi 30. 30. /vis/viewer/set/viewpointThetaPhi 20. 20. /vis/viewer/set/viewpointThetaPhi 20. 20. Now render the same view in RayTracer Now render the same view in RayTracer /vis/open RayTracer /vis/open RayTracer /vis/drawVolume /vis/drawVolume /vis/viewer/set/all viewer-0 /vis/viewer/set/all viewer-0 where viewer-0 is the default name that was assigned to the OGL view where viewer-0 is the default name that was assigned to the OGL view /vis/viewer/flush /vis/viewer/flush

50. 11 January 2011 50Geant4 Visualization Commands J. Perl Compound Commands To allow you to work quickly, Geant4 visualization lets you issue the equivalent of several common commands at one time by using a “compound command”. To allow you to work quickly, Geant4 visualization lets you issue the equivalent of several common commands at one time by using a “compound command”. Some of the commands you have already seen in this presentation are actually compound commands: Some of the commands you have already seen in this presentation are actually compound commands: /vis/open /vis/open /vis/sceneHandler/create /vis/sceneHandler/create /vis/viewer/create /vis/viewer/create /vis/drawVolume /vis/drawVolume /vis/scene/create /vis/scene/create /vis/scene/add/volume /vis/scene/add/volume /vis/viewer/flush /vis/viewer/flush /vis/viewer/refresh /vis/viewer/refresh /vis/viewer/update /vis/viewer/update I mention this just so that you will understand other people’s examples you see that may not contain the familiar /vis/open or /vis/drawVolume I mention this just so that you will understand other people’s examples you see that may not contain the familiar /vis/open or /vis/drawVolume

51. 11 January 2011 51Geant4 Visualization Commands J. Perl Command Guidance Complete guidance on all commands is available from the command line: Complete guidance on all commands is available from the command line: Idle> help Idle> help Command directory path : / Command directory path : / Sub-directories : Sub-directories : 1) /control/ UI control commands. 1) /control/ UI control commands. 2) /units/ Available units. 2) /units/ Available units. 3) /geometry/ Geometry control commands. 3) /geometry/ Geometry control commands. 4) /tracking/ TrackingManager and SteppingManager control commands. 4) /tracking/ TrackingManager and SteppingManager control commands. 5) /event/ EventManager control commands. 5) /event/ EventManager control commands. 6) /run/ Run control commands. 6) /run/ Run control commands. 7) /random/ Random number status control commands. 7) /random/ Random number status control commands. 8) /particle/ Particle control commands. 8) /particle/ Particle control commands. 9) /process/ Process Table control commands. 9) /process/ Process Table control commands. 10) /vis/ Visualization commands. 10) /vis/ Visualization commands. 11) /mydet/ A01 detector setup control commands. 11) /mydet/ A01 detector setup control commands. 12) /hits/ Sensitive detectors and Hits 12) /hits/ Sensitive detectors and Hits 13) /gun/ Particle Gun control commands. 13) /gun/ Particle Gun control commands. Commands : Commands : Type the number ( 0:end, -n:n level back ) : Type the number ( 0:end, -n:n level back ) :

52. 11 January 2011 52Geant4 Visualization Commands J. Perl Guidance Detail Guidance is hierarchical, providing full detail on all commands. Guidance is hierarchical, providing full detail on all commands. Command /vis/open Command /vis/open Creates a scene handler ready for drawing. Creates a scene handler ready for drawing. The scene handler becomes current (the name is auto-generated). The scene handler becomes current (the name is auto-generated). Parameter : graphics-system-name Parameter : graphics-system-name Parameter type : s Parameter type : s Omittable : False Omittable : False Candidates : ATree DAWNFILE HepRepXML HepRepFile RayTracer VRML1FILE VRML2FILE gMocrenFile OGL OGLI OGLS RayTracerX Candidates : ATree DAWNFILE HepRepXML HepRepFile RayTracer VRML1FILE VRML2FILE gMocrenFile OGL OGLI OGLS RayTracerX Parameter : window-size-hint Parameter : window-size-hint pixels pixels Parameter type : i Parameter type : i Omittable : True Omittable : True Default value : 600 Default value : 600 Sub-directories : Sub-directories : 1) /vis/ASCIITree/ Commands for ASCIITree control. 1) /vis/ASCIITree/ Commands for ASCIITree control. 2) /vis/GAGTree/ Commands for GAGTree control. 2) /vis/GAGTree/ Commands for GAGTree control. 3) /vis/heprep/ HepRep commands. 3) /vis/heprep/ HepRep commands. 4) /vis/rayTracer/ RayTracer commands. 4) /vis/rayTracer/ RayTracer commands. 5) /vis/scene/ Operations on Geant4 scenes. 5) /vis/scene/ Operations on Geant4 scenes. 6) /vis/sceneHandler/ Operations on Geant4 scene handlers. 6) /vis/sceneHandler/ Operations on Geant4 scene handlers. 7) /vis/viewer/ Operations on Geant4 viewers. 7) /vis/viewer/ Operations on Geant4 viewers. Commands : Commands : 8) enable * Enables/disables visualization system. 8) enable * Enables/disables visualization system. 9) disable * Disables visualization system. 9) disable * Disables visualization system. 10) verbose * Simple graded message scheme - digit or string (1st character defines): 10) verbose * Simple graded message scheme - digit or string (1st character defines): 11) drawTree * (DTREE) Creates a scene consisting of this physical volume and produces a representation of the geometry hierarchy. 11) drawTree * (DTREE) Creates a scene consisting of this physical volume and produces a representation of the geometry hierarchy. 12) drawView * Draw view from this angle, etc. 12) drawView * Draw view from this angle, etc. 13) drawVolume * Creates a scene consisting of this physical volume and asks the current viewer to draw it. 13) drawVolume * Creates a scene consisting of this physical volume and asks the current viewer to draw it. 14) open * Creates a scene handler ready for drawing. 14) open * Creates a scene handler ready for drawing. 15) specify * Draws logical volume with Boolean components, voxels and readout geometry. 15) specify * Draws logical volume with Boolean components, voxels and readout geometry.

53. 11 January 2011 53Geant4 Visualization Commands J. Perl Complete List of Commands This presentation has shown only a very small subset of Geant4 vis commands. Even for those commands shown, only a few of the options have been presented. This presentation has shown only a very small subset of Geant4 vis commands. Even for those commands shown, only a few of the options have been presented. Each visualization driver may have its own set of additional commands. Each visualization driver may have its own set of additional commands. To see the complete set of commands, use the interactive command guidance (i.e., type help and then type the appropriate number for “vis”). To see the complete set of commands, use the interactive command guidance (i.e., type help and then type the appropriate number for “vis”). Note that many of the command details are only loaded into the help system once you start using the given command e.g., when you first look at the help for /vis/modeling, you will see only /vis/modeling/trajectories/create /vis/modeling/trajectories/list But once you have done your first /vis/modeling/trajectories/create/drawByParticleID you will see many subcommands such as /vis/modeling/trajectories/drawByParticleID-0/set /vis/modeling/trajectories/drawByParticleID-0/setRGBA etc.

54. 11 January 2011 54Geant4 Visualization Commands J. Perl Geant4 Visualization Resources Geant4 Installation Guides  http://geant4.slac.stanford.edu/installation Hands on HepRApp Tutorial  http://geant4.slac.stanford.edu/Presentations/vis/G4HepRAppTutorial/G4HepRAppTutorial.html Hands on DAWN Tutorial  http://geant4.slac.stanford.edu/Presentations/vis/G4DAWNTutorial/G4DAWNTutorial.html Hands on OpenGL Tutorial  http://geant4.slac.stanford.edu/Presentations/vis/G4OpenGLTutorial/G4OpenGLTutorial.html Geant4 Visualization Commands  http://geant4.slac.stanford.edu/Presentations/vis/G4VisCommands.ppt (and.pdf) Geant4 Advanced Visualization  http://geant4.slac.stanford.edu/Presentations/vis/G4VisAdvanced.ppt (and.pdf) How to Make a Movie  http://geant4.slac.stanford.edu/Presentations/vis/HowToMakeAMovie.ppt (and.pdf) Visualization Chapter of the Geant4 User’s Guide for Application Developers  http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/ List of Visualization Commands:  http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/ AllResources/Control/UIcommands/_vis_.html For Questions or Comments: Geant4 Visualization Online Forum:  http://geant4-hn.slac.stanford.edu:5090/HyperNews/public/get/visualization.html