Cycles cage baking: rays miss closest surface #47079

New Issue

Stanislav Blinov · 2015-12-29T02:00:15+01:00

Stanislav Blinov commented

2015-12-29 02:00:15 +01:00

System Information
Linux 64-bit, NVIDIA GTX 560

Blender Version
Broken: 2.76b

Short description of error
When using a cage for baking with Cycles, certain surfaces are missed entirely, and a surface further away from the cage is captured instead.

Without cage:

With cage:

Same geometry (high-poly, low-poly and cage) exported to another software (Maya, TURTLE render):

Exact steps for others to reproduce the error

Open barrel1.blend
Press "bake". The details for the top and bottom ends of the "planks" will not be captured.

Misses are evident if you bake e.g. Diffuse Color instead of Normals.

**System Information** Linux 64-bit, NVIDIA GTX 560 **Blender Version** Broken: 2.76b **Short description of error** When using a cage for baking with Cycles, certain surfaces are missed entirely, and a surface further away from the cage is captured instead. Without cage: ![blender_without_cage.png](https://archive.blender.org/developer/F270793/blender_without_cage.png) With cage: ![blender_with_cage.png](https://archive.blender.org/developer/F270795/blender_with_cage.png) Same geometry (high-poly, low-poly and cage) exported to another software (Maya, TURTLE render): ![turtle_with_cage.png](https://archive.blender.org/developer/F270797/turtle_with_cage.png) **Exact steps for others to reproduce the error** 1. Open [barrel1.blend](https://archive.blender.org/developer/F270800/barrel1.blend) 2. Press "bake". The details for the top and bottom ends of the "planks" will not be captured. Misses are evident if you bake e.g. Diffuse Color instead of Normals.

Stanislav Blinov commented

2015-12-29 02:00:15 +01:00

Changed status to: 'Open'

Stanislav Blinov commented

2015-12-29 02:00:15 +01:00

Added subscriber: @Stan_Pancakes

Sergey Sharybin commented

2015-12-30 10:40:21 +01:00

Added subscriber: @Sergey

Dalai Felinto was assigned by Sergey Sharybin

2015-12-30 10:40:21 +01:00

Sergey Sharybin commented

2015-12-30 10:40:21 +01:00

Dalai, is it something you can look into?

Dalai Felinto commented

2016-01-04 13:59:36 +01:00

Added subscriber: @AndyDavies-3

Dalai Felinto commented

2016-01-04 13:59:36 +01:00

@AndyDavies-3 could you help test/debugging this one?

Andy Davies commented

2016-01-04 16:58:54 +01:00

Yup, sure thing. It seems the cage wasn't expanded enough (though it looks ok at first glance). Alt+S>Apply scale on the cage fixed the issue.
barrel1_fixed.blend

Yup, sure thing. It seems the cage wasn't expanded enough (though it looks ok at first glance). Alt+S>Apply scale on the cage fixed the issue. [barrel1_fixed.blend](https://archive.blender.org/developer/F271535/barrel1_fixed.blend)

Stanislav Blinov commented

2016-01-05 07:06:20 +01:00

How can this be? Is there some minimum margin to uphold? I've extracted the relevant cage and high-poly geometry from the original file, and there's clearly distance between them: barrel1_extracted.blend

How can this be? Is there some minimum margin to uphold? I've extracted the relevant cage and high-poly geometry from the original file, and there's clearly distance between them: [barrel1_extracted.blend](https://archive.blender.org/developer/F271576/barrel1_extracted.blend)

Brecht Van Lommel commented

2016-02-13 22:51:30 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2016-02-13 22:51:30 +01:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2016-02-13 22:51:30 +01:00

Brecht Van Lommel commented

2016-02-13 22:51:30 +01:00

The way cage baking seems to work, the ray direction for baking goes from the point on the cage mesh to the corresponding point on the low poly mesh. The way the cage is set up in this file, very close the other mesh and with the cage face larger and to the side, that direction does not go downwards into the high poly mesh, but sideways.

As far as I can tell there is no bug here, the cage is supposed to control the bake direction like this, and so it should just be shaped or positioned differently for the results you want.

The way cage baking seems to work, the ray direction for baking goes from the point on the cage mesh to the corresponding point on the low poly mesh. The way the cage is set up in this file, very close the other mesh and with the cage face larger and to the side, that direction does not go downwards into the high poly mesh, but sideways. ![cage_correspondence.jpg](https://archive.blender.org/developer/F282500/cage_correspondence.jpg) As far as I can tell there is no bug here, the cage is supposed to control the bake direction like this, and so it should just be shaped or positioned differently for the results you want.

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Cycles cage baking: rays miss closest surface #47079