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RGB To BW node is active when muted
Open, Confirmed, MediumPublic

Description

System Information
Win10 64bit

Blender Version
Broken: 2.79

Short description of error
RGB To BW node is active when muted

Exact steps for others to reproduce the error
Open file and render

Details

Type
Bug

Related Objects

Event Timeline

LazyDodo (LazyDodo) triaged this task as Confirmed, Medium priority.

can confirm on windows, somehow the material view works correctly, but the actual render doesn't.

same is true for Separate RGB btw.

Had a quick look and it seems that on the blender side the internal links are set up correctly (going from color input to the value/float output), but something breaks when cycles inserts/evaluates its ConvertNode.
When the out socket type is not the same as the one linked to the input socket it seems to fail (but dont know enough of the internals here)

Also tried something like P662, but that makes things even worse... Would like to spend more time on this, but hitting my timelimit for now and would like to pass this on to @Brecht Van Lommel (brecht)?