Transparent shadow of object with image texture sequence not updating when previewing animation in Eevee #118561

New Issue

Ole Prinds · 2024-02-21T12:57:23+01:00

Ole Prinds commented

2024-02-21 12:57:23 +01:00

System Information
Operating system: MacOS 12.6
Graphics card: Radeon Pro Vega 20 4 GB

Blender Version
Broken: 4.1 Beta, 4.1 Alpha, 4.0, 3.6.7, 3.5.1, 2.9.3
Worked: No previous version seems to work

Short description of error
When using an image texture sequence as input for a transparent BSDF the shadow of that object is not updating while previewing the animation in Eevee. It works as expected in cycles, and it also works when rendering the animation or just scrubbing through the animation in the timeline. It works with sunlight, but not with spot, area or point light.

I cannot test Eevee next, because it does not yet work for my hardware.

Exact steps for others to reproduce the error

Extract the image sequence gradient2.zip next to the .blend file
Open the attached .blend file and switch to Eevee in the viewport shading
Press play and watch the animation update the texture, but not the shadow
The shadow will update once playback is stopped or when scrubbing through the timeline

I am guessing this is some kind of optimization in the viewport that defers updating the shadow map.

**System Information** Operating system: MacOS 12.6 Graphics card: Radeon Pro Vega 20 4 GB **Blender Version** Broken: 4.1 Beta, 4.1 Alpha, 4.0, 3.6.7, 3.5.1, 2.9.3 Worked: No previous version seems to work **Short description of error** When using an image texture sequence as input for a transparent BSDF the shadow of that object is not updating while previewing the animation in Eevee. It works as expected in cycles, and it also works when rendering the animation or just scrubbing through the animation in the timeline. It works with sunlight, but not with spot, area or point light. I cannot test Eevee next, because it does not yet work for my hardware. **Exact steps for others to reproduce the error** 1. Extract the image sequence gradient2.zip next to the .blend file 2. Open the attached .blend file and switch to Eevee in the viewport shading 3. Press play and watch the animation update the texture, but not the shadow 4. The shadow will update once playback is stopped or when scrubbing through the timeline I am guessing this is some kind of optimization in the viewport that defers updating the shadow map.

transparenttexturetest.blend

885 KiB

gradient2.zip

69 KiB

Ole Prinds added the

labels 2024-02-21 12:57:24 +01:00

Germano Cavalcante commented

2024-02-21 14:05:02 +01:00

Thank you for the reporting.

I can confirm the issue when previewing the animation in EEVEE and EEVEE-Next.

Maybe this behavior is a performance strategy to avoid unnecessary updates if nothing in the scene is moving.
But deserves further investigation from the developers.

Thank you for the reporting. I can confirm the issue when previewing the animation in EEVEE and EEVEE-Next. Maybe this behavior is a performance strategy to avoid unnecessary updates if nothing in the scene is moving. But deserves further investigation from the developers.

Germano Cavalcante added

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Transparent shadow of object with image texture sequence not updating when previewing animation in Eevee #118561