1. 3D graphics in Erlang Jakob Cederlund - jakob@gnodata.se
Björn Gustavsson -
Dan Gudmundsson -

2. 3D graphics in erlang 3D graphics with hardware acceleration
OpenGL - an open version of SGI’s GL
Reasonable API
Open standard
Cross platform (Wintel, Linux, Sun, Mac)
Widespread support from hardware
SDL - a library supplementing OpenGL with interaction, 2D graphics and more

3. erlang and 3D graphics erlang high level language
3D graphics needs symbolic language
Fast development
Performance critical code mostly in 3D hardware and drivers

4. ESDL An erlang driver that interfaces with SDL
Supports most OpenGL calls
Fast
Optimized C driver
Uses binary syntax
Available as download from contrib area
Written by Dan Gudmundsson

5. ESDL
erlang
3D program
esdl-driver
esdl
SDL lib
OpenGL
3D hardware

6. Wings - a 3D modeller in erlang
Uses erlang as functional language
Fast development
Good performance
Powerful
Innovative user interface
Inspired by Nendo
Written by Björn Gustavsson
Some inspiration from Jakob Cederlund

7. Wings Most of the erlang code not performance critical
Some functions optimized
Winged-edge structure for 3D objects
Uses gb_trees and gb_sets (included in OTP R8)

8. Wings - features Powerful modelling
Every operation applicable to several objects at the same time
Imports and exports to different formats
Wavefront
3D studio
Easy to do easy things
As opposed to other 3D modellers

9. Wings - development Functional Only one process
Process dictionary used in for GUI state
Some things suprisingly easy to do
Multiple undo, with shared data
Only updates appriopriate parts of the model
Continues after crash, e.g. to save work
Just a catch, saves dump to file
Library functions used
gb_sets and gb_trees (R8)
sofs - Sets OF Sets (R8)
digraph and digraph_utils

10. Wings - development cont.
Funs used a lot
special fold operations to iterate over model elements
Optimization after implementation and testing
Data structures hidden, used via functions
Most user commands uses primitive commands
Example inset
Extrude
Scale

11. Wings - examples
Rendered in Bryce, composited in PhotoShop

12. Wings - examples cont. Modelled in only 5 minutes!
Rendered afterwards in Bryce

13. Wings - performance Most things fast enough
Optimized floating point in R8
Some things take time
Smooth
Dissolve
Used as primitive by many commands
erlang fast enough, even for interactive tasks

14. Wings - future Long to-do list
Ongoing development, bugfixing and new features
Future features
Plug-ins, both in erlang and C
More export formats, e.g. renderman
Cameras, multiple views
Materials, textures
New platforms (MacOSX)

15. Wings - availability Open source Full source on sourceforge
Compiled versions
Currently requires otp, esdl and SDL
Stand-alone erlang version with installer will be available shortly
Documentation and examples
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