[Bf-committers] qdune review
ton at blender.org
Wed Nov 7 15:16:20 CET 2007
Brecht, Campbell and I sat down for an afternoon checking on the status
of the micropolygon (qdune) renderer. Although we agree it's extremely
useful and has superior features, the integration of this system (i.e.
to use all required Blender features) will take so much additional work
that we decided to put this on hold for a while.
The immediate short term target for Brecht is to get the particle fur
system to render, using improved storage and rendering tricks, but
within the current rendering system. We also will look at using some
kind of bucketing (generation of geometry data per tile).
This is a summary of the status of qdune integration now:
- added exporting API, shared by Blender internal as well as qdune.
Exports mesh/curve/surf geometry.
(note, this is similar to the GSoC project, but different
(note, it can be used for other exports too)
- added qdune code for preparing rendering data to be handed over to
Blender internal shading
(texture coords, lamp coords, etc)
- almost working: shadowbuffer rendering
- to be done: irregular buffers, halos, envmap, renderlayers, passes,
(main reason for postponing it)
- to investigate: speed of the qdune system is below expectation
(slower than Blender internal in comparable shots). Maybe the biggest
gain is in more complex situations
- to be done longer term: raytracing (AO, shadow, mirror), panorama
To be able to make a decision, we also listed the pros and cons for
adopting a micropolygon system in Blender:
- Displacement mapping, motionblur
- Unified render (transparent, solid)
- Support for big scenes, because of efficient bucketing
- Better anti aliasing (for shading too)
- More efficient shading (cache misses)
- Raytrace is hard to integrate (AO, softshadow)
- Still relatively slow compared to Blender
- Lots of work still to get it on functional equal level...
(shadowbuffers, envmaps, halos, lamphalos, render layers, passes,
Brecht definitely is willing to work on further integration later.
But... would help if we could find a partner for him to check on the
integration work and maintenance.
Ton Roosendaal Blender Foundation ton at blender.org
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