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Regression on baking normals with Cycles - reversed normals?
Closed, ResolvedPublic

Description

System Information
Observed on both Win and Mac

Blender Version
Broken: 2.76 official
Worked: 2.75a

Short description of error
There appears to be some baking-related bug, which rotates faces during a bake -- might either be a rotation or a flipped normal.

My artist had no time to report a bug, and it is somewhat difficult to explain why he needs the weird normal map bake, but please trust us that there is a regression and we are all sad.

Exact steps for others to reproduce the error
Open the attached file in both 2.75a and 2.76 and observe difference when hitting "bake".

Related Objects

Event Timeline

Jaagup Irve (irve) raised the priority of this task from to Needs Triage by Developer.
Jaagup Irve (irve) updated the task description. (Show Details)
Jaagup Irve (irve) added a project: BF Blender.
Jaagup Irve (irve) set Type to Bug.

Made a mistake while attaching the file:

Might be related to T42015 , but the testcase runs into the problem even when modifier is deleted.

Bastien Montagne (mont29) renamed this task from Regression on baking to Regression on baking normals with Cycles - reversed normals?.Oct 16 2015, 11:58 AM
Bastien Montagne (mont29) lowered the priority of this task from Needs Triage by Developer to Confirmed, Medium.

I can also confirm this bug. It seems that some but not all faces get rotated by 180 degrees during baking.
Here another example .blend:


Press "Bake". After baking connect the bake_texture output to the Diffuse BSDF.