expose normal map color node problem #51495
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Reference: blender/blender#51495
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System Information
win7 64 gtx970
Blender Version
Broken: blender 2.78.0 git.8ca9fa5 windows64
Short description of error
Expose the 'normal map color' node to a group produce error while using the 'normal map' node 'strength' slider.
If the normal map color is not exposed, I get no error.
Exact steps for others to reproduce the error
Open the file and play with the strength of the "Error_group" output to see the glitch.
Try also with the "ok_group" to see that in this other case the shading doesn't change.
Also if the 'normal map' node is outside a group, of course it doesn't produce any error, so I assume it is a specific problem related to expose the normal map color.
Thank you
normal_input_Bug.blend
Changed status to: 'Open'
Added subscriber: @MassimilianoPuliero
Added subscriber: @Sergey
Changed status from 'Open' to: 'Archived'
The value of color you exposed as the group input is (0.503, 0.497, 1.0) which is close to but not a neutral normal distortion. This is expected you've got changes in shading when tweaking strength.
I've tried to create such a setup form scratch and group input color is properly copied from the node input and stays at (0.5, 0.5, 1.0), so i believe the value was tweaked by accident.
Thanks for the report, but there is no bug here.