texture coordinate "from instancer" option does not work for verts #72101

New Issue

aombk · 2019-12-01T23:35:48+01:00

aombk commented

2019-12-01 23:35:48 +01:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.20

Blender Versions
Broken: version: 2.82 (sub 3), branch: master, commit date: 2019-11-30 17:33, hash: f1ac64921b
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: 26bd5ebd42
and probably more...

Short description of error
texture coordinate "from instancer" option does not work when instancer is set to verts. it works when set to faces
here is a simple blend file:
http://pasteall.org/blend/index.php?id=52640

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.20 **Blender Versions** Broken: version: 2.82 (sub 3), branch: master, commit date: 2019-11-30 17:33, hash: `f1ac64921b` Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-20 14:27, hash: `26bd5ebd42` and probably more... **Short description of error** texture coordinate "from instancer" option does not work when instancer is set to verts. it works when set to faces here is a simple blend file: http://pasteall.org/blend/index.php?id=52640

aombk commented

2019-12-01 23:35:48 +01:00

Added subscriber: @aombk

Philipp Oeser commented

2019-12-02 15:50:02 +01:00

Added subscribers: @Sergey, @lichtwerk

Philipp Oeser commented

2019-12-02 15:50:02 +01:00

Not sure I am reading this wrong:
https://docs.blender.org/manual/en/dev/render/shader_nodes/input/texture_coordinate.html

From Instancer only works with the UV output when the object is instanced, either from particles or from faces.

Cannot really get it to work with Generated coords either though...

Might be a limitation, this is only working for faces?

Note: we had this for faces in viewport rendering #60646 (Texture Coordinate node, From Instancer option do not work as expected in 2.8) which was fixed.

Maybe @Sergey can put the nail in the coffin?

Not sure I am reading this wrong: https://docs.blender.org/manual/en/dev/render/shader_nodes/input/texture_coordinate.html > From Instancer only works with the UV output when the object is instanced, either from particles or from faces. Cannot really get it to work with `Generated` coords either though... Might be a limitation, this is only working for faces? Note: we had this for faces in viewport rendering #60646 (Texture Coordinate node, From Instancer option do not work as expected in 2.8) which was fixed. Maybe @Sergey can put the nail in the coffin?

aombk commented

2019-12-02 19:59:00 +01:00

yes it only works with faces.
it works for particles that are emitted from faces as well, but not when they are emitted from verts.

yes it only works with faces. it works for particles that are emitted from faces as well, but not when they are emitted from verts.

Sergey Sharybin commented

2019-12-06 08:33:39 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2019-12-06 08:33:39 +01:00

Sergey Sharybin self-assigned this 2019-12-06 08:33:39 +01:00

Sergey Sharybin commented

2019-12-06 08:33:39 +01:00

Quite sure it is the same as in all previous versions of Blender.

The reason why this is happening is because texture coordinate is stored per-face-corner (called loop in Blender) and a vertex can be adjacent to a multiple face-corners with different texture coordinates.

There might be a way to find an artist predictable mapping, but it's something what hasn't been done yet.

So thanks for the report, but it's just a known limitation.

Quite sure it is the same as in all previous versions of Blender. The reason why this is happening is because texture coordinate is stored per-face-corner (called loop in Blender) and a vertex can be adjacent to a multiple face-corners with different texture coordinates. There might be a way to find an artist predictable mapping, but it's something what hasn't been done yet. So thanks for the report, but it's just a known limitation.

aombk commented

2019-12-06 18:40:23 +01:00

this makes perfect sense, thanks sergey
i think a better solution than the current one (returning no vertex coordinate information at all) would be to just return the coordinates of a random adjacent face-corner when from instancer is cheked.
in the meantime i will continue looking for a way to fake it

this makes perfect sense, thanks sergey i think a better solution than the current one (returning no vertex coordinate information at all) would be to just return the coordinates of a random adjacent face-corner when from instancer is cheked. in the meantime i will continue looking for a way to fake it

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

texture coordinate "from instancer" option does not work for verts #72101