Math function "Modulo" in Cycles presents different result to the "GLSL material". #43380
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Reference: blender/blender#43380
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System Information
Windows 8.1 64 bits
Blender Version
Broken: 2.73.3 6f7ef81
Short description of error
Viewport "Rendered" different from the "Material".
Exact steps for others to reproduce the error
Set the Math function "Modulo" in a material and see the different results.
bugmaterial.blend
Changed status to: 'Open'
Added subscriber: @mano-wii
Added subscriber: @mont29
Think problem is in Cycles - no reason modulo of a negative number gives nothing…
Added subscribers: @Sergey, @ThomasDinges
Added subscriber: @Psy-Fi
Short story: issue is in GLSL :)
Long story: Module
a % bwitha < 0andb > 0will be negative value, which is being clamped in the color input of the emission shader. In order to match preview you need to get absolute value of the modulo result. Same actually happens in BI.GLSL seems to be doing abs value or so somewhere. Wouldn't mind having @Psy-Fi's eyes here.
This issue was referenced by
3ff9e52dcaChanged status from 'Open' to: 'Resolved'
Closed by commit
3ff9e52dca.