cycles bake artifacts with transparent textures and no color option #50698

New Issue

takateru · 2017-02-16T06:25:23+01:00

takateru commented

2017-02-16 06:25:23 +01:00

System Information
Operating system and graphics card
Windows7, Nvidia GTX 1060

Blender Version
Broken: 2.78a e8299c8
Worked: (optional)

Short description of error

trying to bake mixed shader with transparency with no color option generates too bright area.
non-100% transparency mixing or not transparent materials never generate these issues.
I use these techique for texturing, as seen in the file.

Exact steps for others to reproduce the error
example file: baked_result_too_bright.blend

open the file, DON'T change selection, hit bake.
for illustration attaching screenshots from this file

**System Information** Operating system and graphics card Windows7, Nvidia GTX 1060 **Blender Version** Broken: 2.78a e8299c8 Worked: (optional) **Short description of error** trying to bake mixed shader with transparency with no color option generates too bright area. non-100% transparency mixing or not transparent materials never generate these issues. I use these techique for texturing, as seen in the file. **Exact steps for others to reproduce the error** example file: [baked_result_too_bright.blend](https://archive.blender.org/developer/F486404/baked_result_too_bright.blend) ![baked_result_too_bright.jpg](https://archive.blender.org/developer/F486405/baked_result_too_bright.jpg) open the file, DON'T change selection, hit bake. for illustration attaching screenshots from this file

takateru commented

2017-02-16 06:25:23 +01:00

Changed status to: 'Open'

takateru commented

2017-02-16 06:25:23 +01:00

Added subscriber: @terubozu

Sergey Sharybin commented

2017-02-23 11:27:57 +01:00

Added subscribers: @dfelinto, @Sergey

Dalai Felinto was assigned by Sergey Sharybin

2017-02-23 11:27:57 +01:00

Sergey Sharybin commented

2017-02-23 11:27:57 +01:00

@dfelinto, is it something simple for you to have a quick look at? :)

Dalai Felinto commented

2017-02-23 11:33:30 +01:00

I will look at it shortly. That said, I heard people complaining about lack of color management and baking. So it may be related

Dalai Felinto commented

2017-02-23 15:40:04 +01:00

Hm this happens only with Path Tracing. If you switch to Branched Path Tracing it doesn't happen.

Attached the same file with a 1x1 baked image for quicker testing: baked_result_too_bright_uno.blend

The final pixel has 1200 rgb.

Hm this happens only with `Path Tracing`. If you switch to `Branched Path Tracing` it doesn't happen. Attached the same file with a 1x1 baked image for quicker testing: [baked_result_too_bright_uno.blend](https://archive.blender.org/developer/F494498/baked_result_too_bright_uno.blend) The final pixel has 1200 rgb.

Dalai Felinto commented

2017-02-23 19:13:52 +01:00

@Sergey nothing seems wrong in the baking side of it (kernel_bake.h), and since it doesn't happen with branched path I suspect the problem is in Cycles itself. Shall we look at it together any time soon?

@Sergey nothing seems wrong in the baking side of it (`kernel_bake.h`), and since it doesn't happen with branched path I suspect the problem is in Cycles itself. Shall we look at it together any time soon?

Dalai Felinto removed their assignment 2017-02-24 09:51:34 +01:00

Sergey Sharybin was assigned by Dalai Felinto

2017-02-24 09:51:34 +01:00

Dalai Felinto commented

2017-02-24 09:51:34 +01:00

Added subscriber: @brecht

Dalai Felinto commented

2017-02-24 09:51:34 +01:00

More debugging in case that helps:

The problem has a direct relation with the background plane (the big one underneath the one we are baking). If both objects have any color in the same channel we see the issue.

For example: the background plane has diffuse rgb(1,0,0), and the baked plane rgb(1,0,0) we see the problem. If they have rgb(1,0,0) and rgb(0,1,1) respectively we don't.

Assigning to @Sergey, though who knows, maybe @brecht (friendly poke) has some time to wander around that instead. Or at least some clues to where to look at.

More debugging in case that helps: The problem has a direct relation with the background plane (the big one underneath the one we are baking). If both objects have any color in the same channel we see the issue. For example: the background plane has diffuse rgb(1,0,0), and the baked plane rgb(1,0,0) we see the problem. If they have rgb(1,0,0) and rgb(0,1,1) respectively we don't. Assigning to @Sergey, though who knows, maybe @brecht (friendly poke) has some time to wander around that instead. Or at least some clues to where to look at.

blender-admin commented

2017-02-25 03:09:02 +01:00

This issue was referenced by blender/cycles@bf0331828b

This issue was referenced by blender/cycles@bf0331828b967214277ffad2a3a17cba09621f74

blender-admin commented

2017-02-25 03:09:02 +01:00

This issue was referenced by 8c5826f59a

This issue was referenced by 8c5826f59a37924866ed7dd5bda7fb39c44e8227

Brecht Van Lommel commented

2017-02-25 03:18:54 +01:00

Fixed now, path tracing was baking transparent bounces which should not happen. Branched path already disabled it since it's handled differently for camera rays there.

Brecht Van Lommel commented

2017-02-25 03:18:59 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2017-02-25 03:18:59 +01:00

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cycles bake artifacts with transparent textures and no color option #50698