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Maniphest T48514

Indirect light from toon glossy shader acts like indirect diffuse light
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Description

System Information
Operating system and graphics card

Blender Version
Broken: 2.77a

Short description of error
If you render an object with toon shader, component glossy, it illuminates the objects around it without reflection caustics enabled.
If you set the diffuse bounces to 0, the indirect illumination disappears.
This points to the light reflected from the toon shader to be diffuse, regardless of the comonent.

Exact steps for others to reproduce the error
Place an object with a toon shader set to glossy on a ground plane. Toggle reflection caustics and diffuse bounces 0 / 4. Look at the indirect light coming from the object.

Revisions and Commits

rC Cycles
rC3c30251b1bc8 Fix T48514: Cycles toon glossy BSDF not respecting reflective caustics option.
rB Blender
rBf2ba13964d01 Fix T48514: Cycles toon glossy BSDF not respecting reflective caustics option.

Event Timeline

Frederik Steinmetz (SpiderguyF) created this task.May 25 2016, 1:17 PM
Frederik Steinmetz (SpiderguyF) raised the priority of this task from to 90.
Frederik Steinmetz (SpiderguyF) updated the task description. (Show Details)
Frederik Steinmetz (SpiderguyF) added a project: BF Blender.
Frederik Steinmetz (SpiderguyF) edited a custom field.
Frederik Steinmetz (SpiderguyF) added a subscriber: Frederik Steinmetz (SpiderguyF).
ronan ducluzeau (zeauro) added a subscriber: ronan ducluzeau (zeauro).EditedMay 25 2016, 4:42 PM

Indirect light nature is not relative to objects that produce the bounces but to objects that receive the bounces.
If you disable "glossy" option in Cycles Ray Visibility panel of ground plane with a diffuse shader, it will disappear of the reflection of glossy object placed on it.
It is the exact same principle that you are talking about.

If indirect light from glossy shader acts according to indirect diffuse light setting, render would be the same for a setup with 0 diffuse bounces and 0 glossy bounces as for a setup at 0 diffuse bounces and 4 glossy bounces.

Brecht Van Lommel (brecht) lowered the priority of this task from 90 to 50.May 25 2016, 9:13 PM
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).

There is indeed a bug here, the toon glossy BSDF is not respecting the reflective caustics options. It is treated as glossy otherwise though.

Brecht Van Lommel (brecht) changed the task status from Unknown Status to Resolved by committing rBf2ba13964d01: Fix T48514: Cycles toon glossy BSDF not respecting reflective caustics option..May 25 2016, 9:18 PM
Brecht Van Lommel (brecht) added a commit: rBf2ba13964d01: Fix T48514: Cycles toon glossy BSDF not respecting reflective caustics option..
Sergey Sharybin (sergey) added a commit: rC3c30251b1bc8: Fix T48514: Cycles toon glossy BSDF not respecting reflective caustics option..May 31 2016, 3:33 PM