Volume material ray visibility and diffuse bounces problems #48731
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Reference: blender/blender#48731
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System Information
windows7 64
i5 gtx650 ti
Blender Version
Broken: 2.77a
Short description of error
Use Is Camera Ray node render result is right , use ray visibility camera render result is wrong .
Diffuse bounces >= 1 render result is right , bounces = 0 render result is wrong . Glossy is same .
light_fog_01.blend
Changed status to: 'Open'
Added subscriber: @An_Zi
Added subscriber: @Sergey
Changed status from 'Open' to: 'Archived'
First issue is not a bug, but a specific of how ray visibility optimization works: it'll skip all objects' interseciton on scene ray shooting. For volumes it makes it so volume stack is not updated properly because of intersection points optimized out. It is a known limitation reported and discussed here in the bug tracker several times now.
Second issue is caused by the current terminator, which terminates ray before volume is entered for the indirect light (since that is considered an extra bounce).
Surely improvements are possible, but they are handed outside of the bug tracker. Thanks for the report anyway.