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Maniphest T100873

Mapping node not working correctly
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Description

System Information
Operating system: Ubuntu 18.04
Graphics card: Nvidia Geforce GTX 1050

Blender Version
Broken: it's broken, under Cycles and later Eevee, since 2.79b to 3.22.
Worked: never, as far as I know.

Short description of error
An Image mapped on a UVsphere or on a Roundcube as "Generated - Sphere", is correctly mapped; it should be accordingly rotated, let's say, on the Z axis, instead it gets distorted, no matter if you try by tweaking the Rotation or the Location values.
Note that under Blender Internal in 2.79b, it works correctly, by tweaking the Offset values.

Exact steps for others to reproduce the error
Open in last versions the attached blend file and try to translate on the X or Y axis or to rotate on the Z axis the mapped image. Then try the same in Blender Internal.

spheremapping_nodes_322.blend872 KBDownload

spheremapping_BI_279b.blend604 KBDownload

Event Timeline

Enrico Valenza (env) created this task.Sep 7 2022, 10:57 AM
Germano Cavalcante (mano-wii) closed this task as Archived.Sep 8 2022, 3:27 PM
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

Well, you are comparing two different things.
One is the position of the texture, the other is the transformation of the generated coordinates to be used in a spherical projection of the texture (remembering that the center of the rotation is 0,0,0. In the case of the generated coordinates, this center is not exactly in the middle of the sphere).

For help using Blender, please try one of the community websites: https://www.blender.org/community/

Closing as this bug tracker is only for bugs and errors.

Enrico Valenza (env) added a comment.Sep 8 2022, 4:11 PM

Community websites, are you kidding me? I think you didn't get the issue: in Blender Internal it was possible to map an image texture as Generated - Sphere and rotating it on the mapped object, in Cycles and Eevee, that is with the Mapping node, is no more possible because all you get are deformations.

Germano Cavalcante (mano-wii) added a comment.Sep 8 2022, 7:25 PM

See the manual:
2.79 - https://docs.blender.org/manual/en/2.79/render/blender_render/textures/properties/mapping.html#coordinate-offset-scaling-and-transformation
3.3 - https://docs.blender.org/manual/en/3.3/render/shader_nodes/vector/mapping.html

One changes texture coordinates (Z is for 3D textures only)
The other transforms a 3D vector.

How can we compare these different things?

Germano Cavalcante (mano-wii) added a comment.Sep 8 2022, 7:35 PM

In the example, for the rotation "pivot" to be in the middle of the sphere, you can add a temporary offset:

Enrico Valenza (env) added a comment.Sep 8 2022, 7:47 PM

Nice, I stand corrected then; thanks a lot for the image, it clarifies a lot (honestly, the doc aren't that clear for average users).

Enrico Valenza (env) added a comment.Sep 8 2022, 9:59 PM

Btw, forgive me but I still think that temporary translating the origin cannot be the right behaviour... this way, the scaling doesn't work anymore, it assumes a single value of 1.000.