Cycles bake - high to lowpoly artifacts #45343

New Issue

Vilem Duha · 2015-07-06T13:09:21+02:00

Vilem Duha commented

2015-07-06 13:09:21 +02:00

System Information
win 8
nvidia gf 880m

Blender Version
Broken: (example: 2.69.7 4b206af, see splash screen)
Worked: probably never

Short description of error
When baking high- to low-poly, where the highpoly has a shader with displacement texture(noise texture), there are artifacts as in the uploaded picture.
this happens with combined and normal baking mode, but probably also in other modes as well. It happened to me with many meshes, this is just one small example.

THIS IS NOT A DUPLICATE OF #42015
although it looks similar, and that is the reason why I am reporting so late , because I thought it's the same case- this one is not caused by modifiers. I only noticed that because I noticed similar things also happen on meshes without modifiers.

Exact steps for others to reproduce the error

open the file, hit bake. Then change baking mode to COMBINED, hit bake again - similar artifacts happen.
bakebug_normals1.blend

What is this connected to is that there is a texture connected to the displacement channel of the shader.
there is another version in the file - where the shader seemingly looks the same, but normalmap node is used and plugged into shaders - however, this doesn't get baked, so the result is also flawed. (this is actually just another bug, but probably could be "unfinished feature", so I am not reporting this now)

**System Information** win 8 nvidia gf 880m **Blender Version** Broken: (example: 2.69.7 4b206af, see splash screen) Worked: probably never **Short description of error** When baking high- to low-poly, where the highpoly has a shader with displacement texture(noise texture), there are artifacts as in the uploaded picture. this happens with combined and normal baking mode, but probably also in other modes as well. It happened to me with many meshes, this is just one small example. ![artifacts.jpg](https://archive.blender.org/developer/F203518/artifacts.jpg) THIS IS NOT A DUPLICATE OF #42015 although it looks similar, and that is the reason why I am reporting so late , because I thought it's the same case- this one is not caused by modifiers. I only noticed that because I noticed similar things also happen on meshes without modifiers. **Exact steps for others to reproduce the error** open the file, hit bake. Then change baking mode to COMBINED, hit bake again - similar artifacts happen. [bakebug_normals1.blend](https://archive.blender.org/developer/F203515/bakebug_normals1.blend) What is this connected to is that there is a texture connected to the displacement channel of the shader. there is another version in the file - where the shader seemingly looks the same, but normalmap node is used and plugged into shaders - however, this doesn't get baked, so the result is also flawed. (this is actually just another bug, but probably could be "unfinished feature", so I am not reporting this now)

Vilem Duha commented

2015-07-06 13:09:21 +02:00

Changed status to: 'Open'

Vilem Duha commented

2015-07-06 13:09:21 +02:00

Added subscriber: @VilemDuha

Sergey Sharybin commented

2015-07-07 11:28:02 +02:00

Added subscribers: @dfelinto, @Sergey

Sergey Sharybin commented

2015-07-07 11:28:03 +02:00

@dfelinto, is it something known to you?

Brecht Van Lommel commented

2016-02-18 01:48:13 +01:00

Added subscriber: @brecht

Brecht Van Lommel self-assigned this 2016-02-18 01:48:13 +01:00

Brecht Van Lommel commented

2016-02-18 01:48:13 +01:00

The bug here is that the assumption in 8943dc60 is not correct, the differentials do in fact need to be modified because they are relative to the triangle shape and vertex order.

I think the solution here is basically to transfer the ray differentials like we do in Cycles in kernel_differential.h and in shade_input_set_uv in Blender internal.

The bug here is that the assumption in 8943dc60 is not correct, the differentials do in fact need to be modified because they are relative to the triangle shape and vertex order. I think the solution here is basically to transfer the ray differentials like we do in Cycles in `kernel_differential.h` and in `shade_input_set_uv` in Blender internal.

blender-admin commented

2016-02-18 20:05:57 +01:00

This issue was referenced by 0136046335

This issue was referenced by 01360463352736eebb5f42ad7ae7d61530615b84

Brecht Van Lommel commented

2016-02-18 20:06:40 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2016-02-18 20:06:40 +01:00

Brecht Van Lommel commented

2016-02-18 20:10:42 +01:00

Should be fixed now. Note that to get best results some of the models in this files must be unwrapped again after the fix in 1a676d4e0e. There are a couple triangles that are really stretched so the normal map can't be smooth there even with proper differentials.

Should be fixed now. Note that to get best results some of the models in this files must be unwrapped again after the fix in 1a676d4e0e. There are a couple triangles that are really stretched so the normal map can't be smooth there even with proper differentials.

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Cycles bake - high to lowpoly artifacts #45343