Vertex color banding #66100
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Reference: blender/blender#66100
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System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: AMD Radeon HD 7900 Series ATI Technologies Inc. 4.4.13084 Core Profile Context 14.301.1001.0
Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-24 18:46, hash:
c0c1b4542f
Short description of error
The conversion from sRGB to Linear color in the workbench prepass vertex shader, results in excessive vertex color banding for dark colors.
Found in:
source/blender/draw/engines/workbench/shaders/workbench_prepass_vert.glsl
Exact steps for others to reproduce the error
Vertex Paint
two vertices solid black, and the remaining two dark grey.The preview in Vertex Paint mode shows an expected amount of color banding.
Object Mode
, and set theViewport Shading Color
toVertex
.The plane now shows an excessive amount of color banding.
Additional Information
Leaving the conversion from sRGB to Linear color, until later in processing seems to resolve the color banding. However my attempts to relocate it, all resulted in unintended consequences elsewhere.
Screenshot
Added subscriber: @JHood
Added subscribers: @fclem, @Jeroen-Bakker
#66100.blend
@fclem we currently use
GPU_RGBA8
perhaps we should plan a engine setting to use a high precision buffer for colorsGPU_RGBA16F
. What do you think?will influence the color_buffer and the history_buffer
This issue was referenced by
85c3e12049
Changed status from 'Open' to: 'Resolved'