[Bf-committers] Raytracer Optimization

[blender at erwincoumans.com]

Timothy, 

I think it is a very good idea to generalize the acceleration structure, so 
please pass on this idea to this GSoC proposal that Kent mentioned. 

Apart from KDOP/Octree, an alternative option is to add Bullet dynamic AABB 
tree acceleration for ray queries. Right now this btDbvt is already used for 
broadphase collision detection and occlusion culling (view frustum/occlusion 
maps) in the Blender game engine. 

Thanks,
Erwin 


Kent Mein writes: 

> In reply to Timothy Baldridge (tbaldridge at gmail.com):
>> I've been getting some complaints from some Irix users about degrading
>> performance in recent Blender builds. I was unable to duplicate these
>> claims but the results of my performance study have got me interested
>> in the Raytracer engine. It seems that on the test.blend file we're
>> spending close to 80-90% of the raytracing time in the octree search
>> algorithms. This leads me to wonder if we can do something about the
>> speed of these functions. From my call tree graph of the gprof data it
>> seems that all the octree routines and related code all reside in a
>> collection of 4 functions.
> 
> Hi Timothy, 
> 
> One of the proposed projects for GSOC this year is all about this
> exact issue.  The applications that are accepted should be posted
> soon on the website:
> http://socghop.appspot.com/ 
> 
> We'll probably have an announcement on the blender site as well, once
> the offical announcement has happened. 
> 
> You'll have to check and see if its accepted. 
> 
> Kent
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