[Bf-cycles] Volumetric patch update

Wolfgang Fähnle wfaehnle at freenet.de
Tue Apr 24 07:59:38 CEST 2012

Hi storm, I am testing your patch but can´t get significant differences
enable or disable MLT or play with the settings.
Wich setting has the biggest influence to the result, do you have a test  
with good settings to see the difference?
Here is my test file:

Thank you for increase cycles possibilities and cheers, mib2berlin.

Am 22.04.2012, 00:30 Uhr, schrieb storm <kartochka22 at yandex.ru>:

> Another step close to bi-directional support, i think i have done proper
> MIS between indirect, direct and light chains. There is big missing part
> left, MIS with contribution from many everything-to everything
> connections between eye and light subpaths, but since on simple scenes
> they tend to have little brightness, it not very noticeable.
> No difference for scenes w/o point or mesh lights, you better stay with
> uni-directional PT, it produce absolutely same image using more
> optimised code.
> But for scenes with mesh and point lights there is big advantage, now
> Cycles sample more paths that cannot be found before, and show more
> details (as caustics from point light) that cannot possible with
> uni-directional PT by definition.
> Only Perspective camera supported, without DOF.
> Other constraints:
> wrong ray generation from point light with size > 0, use size=0 for now
> Only diffusion shader get adjacent BSDF (not sure it done right at all,
> but as least it produce smooth image even from light only chain). It
> mean other shaders will work wrong when smooth normal used, producing
> wrong colors, mostly looks as flat faces.
> Some test scenes make many ugly black dots (infinity or negative colors
> with very high value, as result by division by very tiny number). I must
> to find that places and insert extra threshold comparison with some
> magic number.
> Code is mess, extra duplications, unused variables, enormous number of
> commented out code lines with failed attempts, I must clear all that but
> only after i get some sign that it work right, i fear to touch even 1
> line after that messing with probability theory.
> As previous patches, do not save scenes with patched Blender, it can
> lose data.

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