Viewport colour (Solid shading mode, Object color) shows one colour but another is displayed instead for more than 4096 objects #79509

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Dion Moult · 2020-08-04T10:56:46+02:00

Dion Moult commented

2020-08-04 10:56:46 +02:00

System Information
Operating system: Gentoo Linux
Graphics card:

Blender Version
Broken: (example: 2.80, edbf15d3c0, master, 2018-11-28, as found on the splash screen) 2.83.3
Worked: (newest version of Blender that worked as expected) none

See attached Blend file.

Create array of 100 x 100 cubes, and split by loose parts. This creates 10,000 cube objects.
Run the following script to colour the cubes randomly:

import bpy
import random
for obj in bpy.context.visible_objects:
    x = random.randint(1,4)
    if x == 1:
        obj.color = (1,0,0,.2)
    elif x == 2:
        obj.color = (0,1,0,.2)
    elif x == 3:
        obj.color = (0,0,1,.2)
    else:
        obj.color = (1,1,1,.2)

You will see a colourful mosaic of cubes. However, some colours are correct, some colours are wrong. Click some cubes to check. I think that after the 4,096th Cube, the colours start becoming wrong. All cubes prior to that object is the right colour. If you hide or show some cubes in the outliner, you will also see colours start randomly changing.

viewport-color-bug.blend

viewport-color-bug.zip

**System Information** Operating system: Gentoo Linux Graphics card: **Blender Version** Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen) 2.83.3 Worked: (newest version of Blender that worked as expected) none See attached Blend file. 1. Create array of 100 x 100 cubes, and split by loose parts. This creates 10,000 cube objects. 2. Run the following script to colour the cubes randomly: ``` import bpy import random for obj in bpy.context.visible_objects: x = random.randint(1,4) if x == 1: obj.color = (1,0,0,.2) elif x == 2: obj.color = (0,1,0,.2) elif x == 3: obj.color = (0,0,1,.2) else: obj.color = (1,1,1,.2) ``` 3. You will see a colourful mosaic of cubes. However, some colours are correct, some colours are wrong. Click some cubes to check. I _think_ that after the 4,096th Cube, the colours start becoming wrong. All cubes prior to that object is the right colour. If you hide or show some cubes in the outliner, you will also see colours start randomly changing. [viewport-color-bug.blend](https://archive.blender.org/developer/F8743992/viewport-color-bug.blend) [viewport-color-bug.zip](https://archive.blender.org/developer/F8744019/viewport-color-bug.zip)

Dion Moult commented

2020-08-04 10:56:46 +02:00

Added subscriber: @Moult

Marco commented

2020-08-04 11:29:50 +02:00

Added subscriber: @nacioss

Marco commented

2020-08-04 11:29:50 +02:00

Yes i can reproduce it

And as you said it seems like after the 4096th cube it starts to give wrong viewport to object color property relation.
@fclem maybe for you?

Yes i can reproduce it ![image.png](https://archive.blender.org/developer/F8744104/image.png) And as you said it seems like after the 4096th cube it starts to give wrong viewport to object color property relation. @fclem maybe for you?

Marco commented

2020-08-04 11:31:29 +02:00

Added subscriber: @fclem

Philipp Oeser commented

2020-08-04 11:50:21 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-08-04 11:50:21 +02:00

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

Philipp Oeser commented

2020-08-04 11:50:21 +02:00

Can also confirm.
This is only the case for Solid shading mode (set to Object color) though, Material Preview or Eevee Rendered mode seems fine (if you use the Object Info > color socket)

Can also confirm. This is only the case for `Solid` shading mode (set to `Object` color) though, Material Preview or Eevee Rendered mode seems fine (if you use the `Object Info` > color socket)

Philipp Oeser changed title from ~~Viewport colour shows one colour but another is displayed instead~~ to Viewport colour (Solid shading mode, Object color) shows one colour but another is displayed instead for more than 4096 objects

2020-08-04 11:51:44 +02:00

blender-admin commented

2020-08-05 19:27:44 +02:00

This issue was referenced by c15352dd67

This issue was referenced by c15352dd67f551f559c40d7d5e0402dc6ec2e913

blender-admin commented

2020-08-05 19:27:44 +02:00

This issue was referenced by cf3431e0e8

This issue was referenced by cf3431e0e860f91e8a8c74cb964e81456cada29d

Clément Foucault commented

2020-08-05 19:38:01 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Clément Foucault closed this issue

2020-08-05 19:38:01 +02:00

Clément Foucault self-assigned this 2020-08-05 19:38:01 +02:00

Dion Moult commented

2020-08-06 00:15:56 +02:00

You guys are awesome! Thank you so much!

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Viewport colour (Solid shading mode, Object color) shows one colour but another is displayed instead for more than 4096 objects #79509