blender/blender

Erroneous Shadow with Eevee and Sun Lamp and Material with Shadow Mode None #119591

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opened 2024-03-17 14:21:10 +01:00 by philovivero · 4 comments

philovivero commented

2024-03-17 14:21:10 +01:00

System Information
Operating system: macOS-13.6.3-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 Ultra 1.2

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked: Not sure this ever worked.
Note: I've also tested this on 4.1 and it happens there, too.

Short description of error
When sun lamp and object casting shadow on another with Shadow Mode None in material settings, an erroneous shadow appears on the other object which depends on how far away the furthest shadow-casting object is from the sun lamp.

Exact steps for others to reproduce the error
Here's an attached video. What to notice: first I show the weird shadow will disappear or appear depending on the cube being moved on the Y axis (away from the sun lamp). Then I add another cube into the scene, and move it around. Whichever cube is furthest from the sun lamp determines how big the erroneous shadow shall be. I'll attach also the .blend.

You need to switch the left viewport into rendered mode to see it in action.

This does not happen with Cycles, only Eevee.

**System Information** Operating system: macOS-13.6.3-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M2 Ultra 1.2 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: Not sure this ever worked. Note: I've also tested this on 4.1 and it happens there, too. **Short description of error** When sun lamp and object casting shadow on another with Shadow Mode None in material settings, an erroneous shadow appears on the other object which depends on how far away the furthest shadow-casting object is from the sun lamp. **Exact steps for others to reproduce the error** Here's an attached video. What to notice: first I show the weird shadow will disappear or appear depending on the cube being moved on the Y axis (away from the sun lamp). Then I add another cube into the scene, and move it around. Whichever cube is furthest from the sun lamp determines how big the erroneous shadow shall be. I'll attach also the .blend. You need to switch the left viewport into rendered mode to see it in action. This does not happen with Cycles, only Eevee.

WeirdShadow.blend

804 KiB

WeirdShadowInEevee.mp4

1.0 MiB

philovivero added the

labels 2024-03-17 14:21:11 +01:00

Iliya Katushenock added the

Viewport & EEVEE

label 2024-03-17 14:33:35 +01:00

Richard Antalik commented

2024-03-17 20:16:54 +01:00

Member

Can't reproduce on Linux, will check on Mac. Could be Arm specific as well.

Can't reproduce on Linux, will check on Mac. Could be Arm specific as well.

Pratik Borhade commented

2024-03-18 10:01:09 +01:00

Member

Unable to confirm on Windows either.

**System Information**
Operating system: Windows-10-10.0.22631-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.76

Unable to confirm on Windows either. ``` **System Information** Operating system: Windows-10-10.0.22631-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3050 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 551.76 ```

Pratik Borhade added the

label 2024-03-18 10:01:20 +01:00

Michael Parkin-White commented

2024-03-18 11:00:34 +01:00

Able to reproduce in both EEVEE and EEVEE Next, which is odd as they both use separate shadow techniques.
Will investigate what is going on, imagine its possibly an issue with precision and that particular mesh for some reason.

Able to reproduce in both EEVEE and EEVEE Next, which is odd as they both use separate shadow techniques. Will investigate what is going on, imagine its possibly an issue with precision and that particular mesh for some reason.

Pratik Borhade added

Viewport & EEVEE

and removed

Viewport & EEVEE

labels 2024-03-18 11:18:56 +01:00

Philipp Oeser commented

2024-03-18 16:28:51 +01:00

Member

Can confirm as well

**System Information**
Operating system: macOS-14.4-arm64-arm-64bit 64 Bits
Graphics card: Metal API Apple M2 1.2
version: 4.2.0 Alpha, branch: main, commit date: 2024-03-12 22:12, hash: `443ea628c5c8`

works fine on linux

Can confirm as well ``` **System Information** Operating system: macOS-14.4-arm64-arm-64bit 64 Bits Graphics card: Metal API Apple M2 1.2 version: 4.2.0 Alpha, branch: main, commit date: 2024-03-12 22:12, hash: `443ea628c5c8` ``` works fine on linux

Bart van der Braak added

and removed

labels 2024-08-14 13:03:16 +02:00

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Reference: blender/blender#119591

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