visual glitch when using high bitdepth in eevee #81941

New Issue

Diogo Valadares Reis dos Santos · 2020-10-22T02:13:34+02:00

Diogo Valadares Reis dos Santos commented

2020-10-22 02:13:34 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon RX 5700 XT ATI Technologies Inc. 4.5.13587 Core Profile Context 20.4.2 26.20.15029.27017

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-10-19 16:47, hash: 3d26cd01b9

Short description of error
If high bitdepth shadows are enabled in eevee you get weird artifacs near lights

Exact steps for others to reproduce the error

I haven't found if this is a know issue/limitation, so sorry if it is.

the setup can be any plane with any light(excluding the sun) facing downards
activate high bitdepth shadows as shown below.

with high bitdepth enabled:

without high bitdepth enabled:

Note that small changes in the light power can make a huge difference:

Also note that the artifact doesnt only happen below the lamp, it also happens on the sides

highbitglitch.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: AMD Radeon RX 5700 XT ATI Technologies Inc. 4.5.13587 Core Profile Context 20.4.2 26.20.15029.27017 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-10-19 16:47, hash: `3d26cd01b9` **Short description of error** If high bitdepth shadows are enabled in eevee you get weird artifacs near lights **Exact steps for others to reproduce the error** I haven't found if this is a know issue/limitation, so sorry if it is. - the setup can be any plane with any light(excluding the sun) facing downards - activate high bitdepth shadows as shown below. ![image.png](https://archive.blender.org/developer/F9030931/image.png) with high bitdepth enabled: ![image.png](https://archive.blender.org/developer/F9030967/image.png) without high bitdepth enabled: ![image.png](https://archive.blender.org/developer/F9030975/image.png) Note that small changes in the light power can make a huge difference: ![image.png](https://archive.blender.org/developer/F9031049/image.png) Also note that the artifact doesnt only happen below the lamp, it also happens on the sides ![image.png](https://archive.blender.org/developer/F9031067/image.png) ![image.png](https://archive.blender.org/developer/F9031079/image.png) [highbitglitch.blend](https://archive.blender.org/developer/F9030961/highbitglitch.blend)

Diogo Valadares Reis dos Santos commented

2020-10-22 02:13:34 +02:00

Added subscriber: @Diogo_Valadares

Germano Cavalcante commented

2020-10-22 22:46:30 +02:00

Added subscribers: @fclem, @mano-wii

Germano Cavalcante commented

2020-10-22 22:46:30 +02:00

I don't know if it includes this, but according to the manual, shadows can produce artifacts.
This is a reason for having configurable values for Clip Start and Bias. (https://docs.blender.org/manual/en/dev/render/eevee/lighting.html#common-parameters)

I think this is a limitation due to finite-precision or floating-point arithmetic in general.

@fclem, is this a bug or limitation?

I don't know if it includes this, but according to the manual, shadows can produce artifacts. This is a reason for having configurable values for `Clip Start` and `Bias`. (https://docs.blender.org/manual/en/dev/render/eevee/lighting.html#common-parameters) I think this is a limitation due to finite-precision or floating-point arithmetic in general. @fclem, is this a bug or limitation?

Diogo Valadares Reis dos Santos commented

2020-10-22 23:06:49 +02:00

Yes, changing those values seems to fix the problem, I couldn't find the reason why it was being caused as I only looked on this page of the manual: https://docs.blender.org/manual/en/latest/render/eevee/render_settings/shadows.html

thanks for the explanation ^^

Yes, changing those values seems to fix the problem, I couldn't find the reason why it was being caused as I only looked on this page of the manual: https://docs.blender.org/manual/en/latest/render/eevee/render_settings/shadows.html thanks for the explanation ^^

Clément Foucault commented

2020-10-23 01:36:21 +02:00

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

Clément Foucault closed this issue

2020-10-23 01:36:21 +02:00

Clément Foucault self-assigned this 2020-10-23 01:36:21 +02:00

Clément Foucault commented

2020-10-23 01:36:21 +02:00

Your clip start is way too small for the space the light covers, hence the glitch. So nothing abnormal here.

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visual glitch when using high bitdepth in eevee #81941