particle hair color abnormality #87379

New Issue

jo · 2021-04-10T22:04:52+02:00

jo commented

2021-04-10 22:04:52 +02:00

Operating system: windows 10
Graphics card: RTX 2060

Blender Version
Broken: blender 2.90 and above, including 2.93A
Worked: blender 2.83 LTS

Short description of error
there are 3 planes, each plane has two particle hair systems. the particle hairs that on the same plane has the same material.
in blender 2.83 LTS. the color display as intended. since 2.90, when both hair system are active, the color is mix with others of different planes and different materials. if either one of the hair systems that on the same plane is disable, the color return to normal. in 2.83 it looks right, but in 2.90 and above, the blue and green materials also mix with red somehow.

Exact steps for others to reproduce the error
open attached blend file in 290 and above, switch to preview render to see the color mixed within different materials.
change the color_ramp.interpolation to different type from each other would fix the issue, for example, mat1's color_ramp.interpolation to linear, mat2's color_ramp.interpolation to ease, mat3's color_ramp.interpolation to cardinal

particle hair color.blend

Operating system: windows 10 Graphics card: RTX 2060 **Blender Version** Broken: blender 2.90 and above, including 2.93A Worked: blender 2.83 LTS **Short description of error** there are 3 planes, each plane has two particle hair systems. the particle hairs that on the same plane has the same material. in blender 2.83 LTS. the color display as intended. since 2.90, when both hair system are active, the color is mix with others of different planes and different materials. if either one of the hair systems that on the same plane is disable, the color return to normal. in 2.83 it looks right, but in 2.90 and above, the blue and green materials also mix with red somehow. ![283LTS.jpg](https://archive.blender.org/developer/F9928445/283LTS.jpg) ![290Above.jpg](https://archive.blender.org/developer/F9928446/290Above.jpg) **Exact steps for others to reproduce the error** open attached blend file in 290 and above, switch to preview render to see the color mixed within different materials. change the color_ramp.interpolation to different type from each other would fix the issue, for example, mat1's color_ramp.interpolation to linear, mat2's color_ramp.interpolation to ease, mat3's color_ramp.interpolation to cardinal [particle hair color.blend](https://archive.blender.org/developer/F9928444/particle_hair_color.blend)

jo commented

2021-04-10 22:04:52 +02:00

Added subscriber: @sleepyhead

Philipp Oeser commented

2021-04-12 10:07:30 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-04-12 10:07:30 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2021-04-12 10:07:30 +02:00

Can confirm, will check.

Philipp Oeser commented

2021-04-12 11:03:55 +02:00

This is actually the same as #78845 (Some hair particles are rendered the wrong material in EEVEE).
I have raised priority there and updated that task with files/pics provided here.
Will merge these reports.

This is actually the same as #78845 (Some hair particles are rendered the wrong material in EEVEE). I have raised priority there and updated that task with files/pics provided here. Will merge these reports.

Philipp Oeser commented

2021-04-12 11:04:08 +02:00

Closed as duplicate of #78845

Philipp Oeser closed this issue

2021-04-12 11:04:08 +02:00

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particle hair color abnormality #87379