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Maniphest T47670

Layer weight gives incorrect result in GLSL Material mode
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Description

System Information
NixOS Linux, kernel 3.18.26
GeForce GTX 970, driver 352.63

Blender Version
Broken: 2.77-rc1
Worked: 2.76b

Short description of error
Cycles layer weight node shows an incorrect result in Material mode in the viewport.

In 2.76, the attached file shows as follows:

While in 2.77-rc1 I get this:

Exact steps for others to reproduce the error
See attached blend file in Material mode in the viewport.

bug.blend453 KBDownload

A workaround is to connect the Normal input of the Layer weight node to the Normal output of a Geometry node. However, connecting to a image texture normal map gives wrong results.

Note: reverting commit 72dd1ba3fe67206680ef3540b681d944e8bb4872 ("Fix T47349: incorrect Cycles fresnel and layer weight with GLSL materials") fixes the problem for me. However, that does break the workaround described above (i.e. where the Normal output of the Geometry node is used).

Revisions and Commits

rB Blender
rB6bfd88acd949 Fix T47670: cycles GLSL incorrect normal map node.
rB002deb29cbc2 Fix T47670: cycles GLSL incorrect layer weight / fresnel.

Related Objects

Event Timeline

Eelco Dolstra (edolstra) created this task.Mar 2 2016, 10:18 PM
Eelco Dolstra (edolstra) raised the priority of this task from to 90.
Eelco Dolstra (edolstra) updated the task description. (Show Details)
Eelco Dolstra (edolstra) added a project: BF Blender.
Eelco Dolstra (edolstra) edited a custom field.
Eelco Dolstra (edolstra) added a subscriber: Eelco Dolstra (edolstra).
mangostaniko added a subscriber: mangostaniko.Mar 3 2016, 3:40 PM
Thomas Dinges (dingto) assigned this task to Brecht Van Lommel (brecht).Mar 3 2016, 10:34 PM
Thomas Dinges (dingto) added a subscriber: Thomas Dinges (dingto).

Brecht, can you please check? :)

Thomas Dinges (dingto) added a subscriber: Ralf Hölzemer (cheleb).Mar 3 2016, 10:34 PM
Bastien Montagne (mont29) lowered the priority of this task from 90 to Normal.Mar 4 2016, 10:24 AM
Bastien Montagne (mont29) added a project: Cycles.
Brecht Van Lommel (brecht) changed the task status from Unknown Status to Resolved by committing rB002deb29cbc2: Fix T47670: cycles GLSL incorrect layer weight / fresnel..Mar 5 2016, 2:34 PM
Brecht Van Lommel (brecht) added a commit: rB002deb29cbc2: Fix T47670: cycles GLSL incorrect layer weight / fresnel..
Eelco Dolstra (edolstra) added a comment.Mar 5 2016, 8:06 PM

Thanks! However, it still gives an incorrect result when the layer weight has a Normal Map node as an input, e.g.:


In 2.76 the normal input had no effect in GLSL mode (i.e. the output looked like the first image above).

Brecht Van Lommel (brecht) added a commit: rB6bfd88acd949: Fix T47670: cycles GLSL incorrect normal map node..Mar 6 2016, 6:56 AM
Kévin Dietrich (kevindietrich) mentioned this in T47716: Cycles fresnel textures display texture normals wrong in viewport.Mar 7 2016, 6:23 PM
Kévin Dietrich (kevindietrich) merged a task: T47716: Cycles fresnel textures display texture normals wrong in viewport.
Kévin Dietrich (kevindietrich) added subscribers: Kévin Dietrich (kevindietrich), Adrian Winchell (snapai).