Texture baking with shadow sampling leads to nondeterministic results (blender internal engine) #44598

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opened 2015-05-04 10:38:54 +02:00 by Fabian Emmes · 13 comments

Fabian Emmes commented

2015-05-04 10:38:54 +02:00

System Information
Archlinux, Sandy Bridge I5.

Blender Version
Broken: 2.74

Short description of error
Baking the same texture twice leads to different results.

Exact steps for others to reproduce the error

Open baking.blend.
Press "Bake" in render Panel.
Look at generated texture.
Press "Bake" again.
Notice how texture changed.

**System Information** Archlinux, Sandy Bridge I5. **Blender Version** Broken: 2.74 **Short description of error** Baking the same texture twice leads to different results. **Exact steps for others to reproduce the error** 1. Open [baking.blend](https://archive.blender.org/developer/F169927/baking.blend). 2. Press "Bake" in render Panel. 3. Look at generated texture. 4. Press "Bake" again. 5. Notice how texture changed.

Fabian Emmes commented

2015-05-04 10:38:54 +02:00

Author

Changed status to: 'Open'

Changed status to: 'Open'

Fabian Emmes commented

2015-05-04 10:38:54 +02:00

Author

Added subscriber: @der_fab

Added subscriber: @der_fab

Bastien Montagne commented

2015-05-06 12:27:24 +02:00

Owner

Added subscriber: @mont29

Added subscriber: @mont29

Bastien Montagne commented

2015-05-06 12:29:04 +02:00

Owner

Added subscriber: @Sergey

Added subscriber: @Sergey

Bastien Montagne commented

2015-05-06 12:29:04 +02:00

Owner

Can confirm the issue, but not sure it is expected to be deterministic? Sergey, maybe you know? To me, there is no real reason to make it so here, and it would probably be harder to do too, deterministic reproducible randomness in multi-threaded context is rather hairy afaik…

Can confirm the issue, but not sure it is expected to be deterministic? Sergey, maybe you know? To me, there is no real reason to make it so here, and it would probably be harder to do too, deterministic reproducible randomness in multi-threaded context is rather hairy afaik…

Bastien Montagne commented

2015-05-06 12:30:09 +02:00

Owner

Also, note that this is not really related to baking imho, this is valid for any render. This is just highly noticeable here because of very low res.

Also, note that this is not really related to baking imho, this is valid for any render. This is just highly noticeable here because of very low res.

Fabian Emmes commented

2015-05-06 12:35:50 +02:00

Author

No, the normal render produces deterministic results, for every test I did (including this example). So I think this is baking specific.

No, the normal render produces deterministic results, for every test I did (including this example). So I think this is baking specific.

Bastien Montagne commented

2015-05-06 12:46:44 +02:00

Owner

Ack, yes, you are right, regular renders seems to produce same result always (at least with same amount of threads - changing that changes result)… So guess there is something wrong in handling of randomness in baking.

Ack, yes, you are right, regular renders seems to produce same result always (at least with same amount of threads - changing that changes result)… So guess there is something wrong in handling of randomness in baking.

blender-admin commented

2015-05-06 23:06:47 +02:00

This issue was referenced by e73f1035d7

This issue was referenced by e73f1035d7e544f83cadceb5a44acfa1e9fb1921

Brecht Van Lommel commented

2015-05-06 23:08:22 +02:00

Owner

Added subscriber: @brecht

Added subscriber: @brecht

Brecht Van Lommel commented

2015-05-06 23:08:22 +02:00

Owner

Thanks for the report, fixed now.

Thanks for the report, fixed now.

Brecht Van Lommel commented

2015-05-06 23:08:26 +02:00

Owner

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2015-05-06 23:08:26 +02:00

Brecht Van Lommel commented

2015-05-06 23:08:26 +02:00

Owner

Closed by commit e73f1035d7.

Closed by commit e73f1035d7.

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