Loss of Viewport Shading color in 3D Viewport #120751

New Issue

Olivier · 2024-04-17T21:57:18+02:00

Olivier commented

2024-04-17 21:57:18 +02:00

System Information
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.86

Blender Version
Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: e1743a0317bc
Worked: (newest version of Blender that worked as expected)

Short description of error
When zoom in the 3D Viewport Shading loose the Color of mesh.

Exact steps for others to reproduce the error
open my test file, in Object or Edit Mode
zoom or Rotate view in 3D Viewport or change size of 3D Viewport Aera by moving the common side with Properties Aera
4.1.0 : the problem is visible
4.1.1 launch with --factory-startup : the problem is visible
4.2.0 alpha main.d3fb68f5183b : the problem is visible

4.1.1 launch with --factory-startup and without Load UI : the problem is not visible
3.6.11 : the problem is not visible

I cannot reproduce my problem on a Default scene, only on my scene
Because it's first time I can see this and the problem doesn't appear on 3.6.11 I think it's intressting to share

**System Information** Operating system: Windows-10-10.0.22631-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.86 **Blender Version** Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: `e1743a0317bc` Worked: (newest version of Blender that worked as expected) **Short description of error** When zoom in the 3D Viewport Shading loose the Color of mesh. **Exact steps for others to reproduce the error** open my test file, in Object or Edit Mode zoom or Rotate view in 3D Viewport or change size of 3D Viewport Aera by moving the common side with Properties Aera 4.1.0 : the problem is visible 4.1.1 launch with --factory-startup : the problem is visible 4.2.0 alpha main.d3fb68f5183b : the problem is visible 4.1.1 launch with --factory-startup and without Load UI : the problem is not visible 3.6.11 : the problem is not visible I cannot reproduce my problem on a Default scene, only on my scene Because it's first time I can see this and the problem doesn't appear on 3.6.11 I think it's intressting to share

problem_test_scene_plant.blend

627 KiB

blender_x6Jci6b1jT.mp4

3.5 MiB

Olivier added the

labels 2024-04-17 21:57:19 +02:00

YimingWu commented

2024-04-18 04:32:03 +02:00

Extreme near/far clipping plane seems to be causing the issue. In your file you have set start = 0.0001 and end = 10000. By default it is 0.01 to 1000. Perspective division is known to have very little precision in extreme start/end clipping plane values.

3.6 doesn't seem to have this problem even if the clipping plane is set to such angle. Also, if you don't load UI, the view clipping plane associated with individual 3d viewport won't be loaded and the value should be good.

Looks to me this could be caused by precision issue in frustum clipping (if viewport has one)?

Extreme near/far clipping plane seems to be causing the issue. In your file you have set `start = 0.0001` and `end = 10000`. By default it is 0.01 to 1000. Perspective division is known to have very little precision in extreme start/end clipping plane values. 3.6 doesn't seem to have this problem even if the clipping plane is set to such angle. Also, if you don't load UI, the view clipping plane associated with individual 3d viewport won't be loaded and the value should be good. Looks to me this could be caused by precision issue in frustum clipping (if viewport has one)?

YimingWu added

and removed

labels 2024-04-18 04:32:18 +02:00

Olivier commented

2024-04-18 09:18:42 +02:00

yes you're right, in fact this only happens on extreme ranges of clipping values, for example :
start = 0.01 and end = 1000000
start = 0.001 and end = 100000
start = 0.0001 and end = 10000
with an order-of-magnitude difference of 100 million
it's happen only for color

In fact, it's easy to reproduce in a Startup File, just enter the extreme values in Clipping View.
even in 3.6.11

perhaps a user-side bug 🫣

yes you're right, in fact this only happens on extreme ranges of clipping values, for example : `start = 0.01` and `end = 1000000` `start = 0.001` and `end = 100000` `start = 0.0001` and `end = 10000` with an order-of-magnitude difference of 100 million it's happen only for color **In fact, it's easy to reproduce in a Startup File, just enter the extreme values in Clipping View.** even in 3.6.11 perhaps a user-side bug 🫣

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Loss of Viewport Shading color in 3D Viewport #120751