Cycles bakes wrong material's property to texture. #70641

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Balazs Oszvald · 2019-10-08T14:48:04+02:00

Balazs Oszvald commented

2019-10-08 14:48:04 +02:00

Operating system: Windows 10
Graphics card: NVidia GTX1060
Broken: 2.80 official but 2.81 Alpha (a856c5eccf) has the same issue

Cycles bakes wrong material's property to texture.

Take the default cube, assign a new material to any face (so that is has 2 materials, for example with different base color).
Create a texture node (the one to bake to) only in the second material's shader tree.
Now if you bake the diffuse color, it bakes the first material's color to the faces of the second material (other texture areas stay intact).

If you add extra materials it gets more weird as there are materials that are baked, others not and it swaps even more colors.
(Check the attached 2.80 .blend: hit bake to render blue and green colors to the places where yellow should appear. Copy the bake texture node to another material and bake again to have other strange result.)

If the bake texture node is added to each materials' shader tree, you get no issues (I expected this result with one simple bake texture added to any of the materials.)

It has the same issue if you select another material property (like roughness, etc.)

Seems like an indexing issue...

bake_issue.blend

Operating system: Windows 10 Graphics card: NVidia GTX1060 Broken: 2.80 official but 2.81 Alpha (a856c5eccffb) has the same issue Cycles bakes wrong material's property to texture. Take the default cube, assign a new material to any face (so that is has 2 materials, for example with different base color). Create a texture node (the one to bake to) only in the second material's shader tree. Now if you bake the diffuse color, it bakes the first material's color to the faces of the second material (other texture areas stay intact). If you add extra materials it gets more weird as there are materials that are baked, others not and it swaps even more colors. (Check the attached 2.80 .blend: hit bake to render blue and green colors to the places where yellow should appear. Copy the bake texture node to another material and bake again to have other strange result.) If the bake texture node is added to each materials' shader tree, you get no issues (I expected this result with one simple bake texture added to any of the materials.) It has the same issue if you select another material property (like roughness, etc.) Seems like an indexing issue... [bake_issue.blend](https://archive.blender.org/developer/F7796590/bake_issue.blend)

Balazs Oszvald commented

2019-10-08 14:48:04 +02:00

Added subscriber: @BalazsOszvald

Philipp Oeser commented

2019-10-09 09:58:58 +02:00

Added subscribers: @dfelinto, @lichtwerk

Philipp Oeser commented

2019-10-09 09:58:58 +02:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2019-10-09 09:58:58 +02:00

Philipp Oeser self-assigned this 2019-10-09 09:58:58 +02:00

Philipp Oeser commented

2019-10-09 09:58:58 +02:00

While this might sound inconvenient, you need an active ImageTexture in every material, otherwise you end up with this "undefined" behavior.

Blender spits out this report (it quickly gets overwritten by other reports, so you can see it in the Info Editor)

No active image found in material slot (0) for object "Cube"
No active image found in material "Material" (1) for object "Cube"
No active image found in material "Material.001" (2) for object "Cube"

Like I said, this could be improved upon (there are also external Addons that can help here, look around on blenderartists.org for those), but would not consider this a bug atm.
https://wiki.blender.org/wiki/Reference/Not_a_bug

Will close this, but feel free to comment again if issues persist...
CC @dfelinto

While this might sound inconvenient, you need an active ImageTexture in **every** material, otherwise you end up with this "undefined" behavior. Blender spits out this report (it quickly gets overwritten by other reports, so you can see it in the Info Editor) ``` No active image found in material slot (0) for object "Cube" No active image found in material "Material" (1) for object "Cube" No active image found in material "Material.001" (2) for object "Cube" ``` Like I said, this could be improved upon (there are also external Addons that can help here, look around on blenderartists.org for those), but would not consider this a bug atm. https://wiki.blender.org/wiki/Reference/Not_a_bug Will close this, but feel free to comment again if issues persist... CC @dfelinto

Balazs Oszvald commented

2019-10-09 11:33:12 +02:00

It is no problem if baking needs active textures in multiple materials (might be intended -> bake onlymaterials where the node is present), but still, if those are not there it should not bake other material's property?!

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Cycles bakes wrong material's property to texture. #70641