1. How to Visualize in OpendTect Layers and Transparency, Volume Rendering & Iso surfaces
Geert de Bruin

2. Introduction
OpendTect is a powerful tool for attribute analysis and advanced object detection
Visualizing the results is almost as important as the results themselves, therefore OpendTect has several advanced visualization options
This presentation helps you to get best out of OpendTect: layers, transparency, color-bars, volume rendering and iso surfaces

3. Overview Working with attribute layers and transparency
Visualizing data in 3D: Volume rendering
Iso-surfaces (prototype)

4. Working with attribute layers
Layer 2: Attribute
In OpendTect one element (inline, crossline, time-slice, horizon, random-line) can have multiple attribute displays or layers
The attribute on layer 2 is masking the seismic data on layer 1. Therefore we make the second layer (partially) transparent
Layer 1: Seismic data
Uniform transparency
Part transparent /
part opaque

5. Part transparent / part opaque
The concept is to make a certain value-domain completely transparent (low attribute values), while keeping the other values opaque (high attribute values).

6. Workflow in OpendTect Display seismic data
Right click on the element and select “add attribute”

7. Workflow in OpendTect Display seismic data
Right click on the element and select “add attribute”
Display an attribute on the new layer
Select the layer and choose the color-bar “chimney”
Tip:
Shift + Arrow Up/Down
To changes the order

8. Workflow in OpendTect
Right click on the color-bar to flip or edit it

9. Consult OpendTect user-documentation

10. Uniform transparency
Uniform transparency is equally simple to perform

11. Uniform transparency
Layer 1 Seismic Data

12. Uniform transparency
Layer 2 Acoustic impedance
Layer 1 Seismic Data

13. Uniform transparency

14. Uniform transparency

15. Overview Working with attribute layers and transparency
Visualizing data in 3D: Volume rendering
Iso-surfaces (prototype)

16. Visualizing data in 3D: Volume rendering
Display an attribute in a volume viewer. Make a certain value-domain completely transparent (low attribute values), while keeping the other values opaque (high attribute values).

17. Volume rendering
Add a volume and position it

18. Add a volume and position it
Load the attribute
Deselect “inline crossline and time” & select “volren”

19. Add a volume and position it
Load the attribute
Deselect “inline crossline and time” & select “volren”
Choose a color-bar with transparency (Chimney)

20. Overview Working with attribute layers and transparency
Visualizing data in 3D: Volume rendering
Iso-surfaces (prototype)

21. Add a volume and load the attribute data
Right click in the volume item in the tree and select Add> Iso surface
Iso surface

22. The color of the isosurface corresponds to the color in the color bar at the value of the isosurface (ignoring transparency)

23. Changing the iso value will thus result in a different color and shape

24. Iso surface: ChimneyCube