Film -> Pixel Filter settings are not used when baking textures #108033

New Issue

Nathan Hayes · 2023-05-18T06:36:48+02:00

Nathan Hayes commented

2023-05-18 06:36:48 +02:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: AMD Radeon R9 200 Series ATI Technologies Inc. 4.5.14831 Core Profile Context 21.5.2 27.20.20903.8001

Blender Version
Broken: version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash: 1be25cfff18b
Worked: (newest version of Blender that worked as expected)

Short description of error

Pixel Filter settings are not used when Baking a Texture, changing them does not effect Baking in any way. The width seems to be fixed at a value of around 0.1
Had a quick look at the github and I'm guessing they aren't passed to the render when Baking.

Exact steps for others to reproduce the error

Render any texture with sub pixel details to a texture, see attached file as example

Enable viewport render preview
Adjust Film->Pixel Filter value, it's effective
Bake the texture
No matter how you adjust Film->Pixel Filter value, it's not effective on the baked result

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: AMD Radeon R9 200 Series ATI Technologies Inc. 4.5.14831 Core Profile Context 21.5.2 27.20.20903.8001 **Blender Version** Broken: version: 3.5.0, branch: blender-v3.5-release, commit date: 2023-03-29 02:56, hash: `1be25cfff18b` Worked: (newest version of Blender that worked as expected) **Short description of error** Pixel Filter settings are not used when Baking a Texture, changing them does not effect Baking in any way. The width seems to be fixed at a value of around 0.1 Had a quick look at the github and I'm guessing they aren't passed to the render when Baking. **Exact steps for others to reproduce the error** Render any texture with sub pixel details to a texture, see attached file as example - Enable viewport render preview - Adjust Film->Pixel Filter value, it's effective - Bake the texture - No matter how you adjust Film->Pixel Filter value, it's not effective on the baked result

bake aliasing.blend

1.8 MiB

Nathan Hayes added the

labels 2023-05-18 06:36:49 +02:00

YimingWu commented

2023-05-18 08:15:20 +02:00

Can confirm. Baked result does not seem to be affected by the Pixel Filter value, but I'm not sure if this is a bug, because Pixel Filter mostly controls how the result is displayed onto the viewport. Will forward to devs.

👎 1

YimingWu added

Module

Render & Cycles

Status

Needs Info from Developers

and removed

Status

Needs Triage

labels 2023-05-18 08:15:45 +02:00

YimingWu changed title from ~~Pixel Filter (anti-aliasing) settings are not used when baking textures~~ to Film -> Pixel Filter settings are not used when baking textures

2023-05-18 08:16:11 +02:00

Nathan Hayes commented

2023-05-20 05:53:29 +02:00

" but I'm not sure if this is a bug "

I consider it a bug as baking normal maps in some cases results in heavy checkerboard aliasing (fabric detail textures as an example). There are numerous forum posts about it, and some users have commented that they have to bake normals outside of Blender because of it. Or bake at 2x and manually sample down, which does not solve the issue (any banding/aliasing is simply blurred instead of removed)

> " but I'm not sure if this is a bug " I consider it a bug as baking normal maps in some cases results in heavy checkerboard aliasing (fabric detail textures as an example). There are numerous forum posts about it, and some users have commented that they have to bake normals outside of Blender because of it. Or bake at 2x and manually sample down, which does not solve the issue (any banding/aliasing is simply blurred instead of removed)

👀 1

Nathan Hayes commented

2023-05-27 06:15:42 +02:00

Please update to triage as this is a bug that prevents texture baking from functioning correctly.
The pixel filter setting needs to be correct, the results of it not being is:

More samples required for light and texture baking, with remedial results
Additional samples do not contribute to noise reduction on smaller details
Gradient boundaries and sharp edges always have aliasing
Normal maps are incorrect due to aliasing
Blender cannot be used to generate correctly sampled Mip Maps
Lightmap baking is subject to unreducible noise due to lack of surface area sampled
Denoising filter is effected heavily by aliasing and incorrectly emphasizes aliasing instead of reducing it

Please update to triage as this is a bug that prevents texture baking from functioning correctly. The pixel filter setting needs to be correct, the results of it not being is: More samples required for light and texture baking, with remedial results Additional samples do not contribute to noise reduction on smaller details Gradient boundaries and sharp edges always have aliasing Normal maps are incorrect due to aliasing Blender cannot be used to generate correctly sampled Mip Maps Lightmap baking is subject to unreducible noise due to lack of surface area sampled Denoising filter is effected heavily by aliasing and incorrectly emphasizes aliasing instead of reducing it

👀 1

Nathan Hayes commented

2023-07-12 06:51:46 +02:00

https://github.com/blender/cycles/blob/main/src/kernel/integrator/init_from_bake.h

Unfortunately baking cannot sample over to other triangles. However, the does not explain why the aliasing is so bad in the demo file provided, it only has 2 triangles. It also seems Pixel Width is not used here at all (could we multiply ddx,ddy by filter size?).

It would be reasonable to assume some of these functions are not producing good results. bake_jitter_barycentric for example may be missing in most cases. Resulting in only the center sample being used most of the time, and a performance hit as it needlessly does the whole 10 iterations and ends up returning the unchanged value anyway.

bake_offset_towards_center has two hand picked values that might need testing.

Regardless of the triangle edge cases its clear the sampling width does not cover an entire texel at all.

https://github.com/blender/cycles/blob/main/src/kernel/integrator/init_from_bake.h Unfortunately baking cannot sample over to other triangles. However, the does not explain why the aliasing is so bad in the demo file provided, it only has 2 triangles. It also seems Pixel Width is not used here at all (could we multiply ddx,ddy by filter size?). It would be reasonable to assume some of these functions are not producing good results. bake_jitter_barycentric for example may be missing in most cases. Resulting in only the center sample being used most of the time, and a performance hit as it needlessly does the whole 10 iterations and ends up returning the unchanged value anyway. bake_offset_towards_center has two hand picked values that might need testing. Regardless of the triangle edge cases its clear the sampling width does not cover an entire texel at all.

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Film -> Pixel Filter settings are not used when baking textures #108033