Alembic cache of Cloth Sim unaffected by Smooth/Flat shading. #70710

New Issue

Michael Hermann · 2019-10-10T18:35:47+02:00

Michael Hermann commented

2019-10-10 18:35:47 +02:00

System Information
Operating system: Linux-5.3.5-arch1-1-ARCH-x86_64-with-arch 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 22:31, hash: f61a8a2abd
Worked: 2.80 (Release)

Short description of error
Cloth simulations that are reimported in to Blender via Alembic seem to ignore the shading type. (Smooth/Flat)
This used to work in 2.80 and got broken somewhere along the way.

Possibly related to: #69182
However, here the vertex count is not changing.

In 2.80:

Exact steps for others to reproduce the error
See attached blendfile or import the attached ABC files and change the shading to smooth/flat. - The shading will change correctly on the left cube but not on the right cube which has the cloth sim.

noN.abc

N.abc

ABC_Shading.blend

**System Information** Operating system: Linux-5.3.5-arch1-1-ARCH-x86_64-with-arch 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21 **Blender Version** Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 22:31, hash: `f61a8a2abd` Worked: 2.80 (Release) **Short description of error** Cloth simulations that are reimported in to Blender via Alembic seem to ignore the shading type. (Smooth/Flat) This used to work in 2.80 and got broken somewhere along the way. Possibly related to: [#69182 ](https://developer.blender.org/T69182) However, here the vertex count is not changing. ![ABC_Shading.png](https://archive.blender.org/developer/F7802321/ABC_Shading.png) In 2.80: ![AlembicNormals280.png](https://archive.blender.org/developer/F7802351/AlembicNormals280.png) **Exact steps for others to reproduce the error** See attached blendfile or import the attached ABC files and change the shading to smooth/flat. - The shading will change correctly on the left cube but not on the right cube which has the cloth sim. [noN.abc](https://archive.blender.org/developer/F7802402/noN.abc) [N.abc](https://archive.blender.org/developer/F7802403/N.abc) [ABC_Shading.blend](https://archive.blender.org/developer/F7802404/ABC_Shading.blend)

Michael Hermann commented

2019-10-10 18:35:47 +02:00

Added subscriber: @MichaelHermann

Germano Cavalcante commented

2019-10-11 14:04:26 +02:00

Added subscribers: @dr.sybren, @mano-wii

Sybren A. Stüvel was assigned by Germano Cavalcante

2019-10-11 14:04:26 +02:00

Germano Cavalcante commented

2019-10-11 14:04:26 +02:00

@dr.sybren, can you confirm this problem?
Any idea what has changed between releases that may have introduced this issue?

@dr.sybren, can you confirm this problem? Any idea what has changed between releases that may have introduced this issue?

Sybren A. Stüvel commented

2019-10-13 12:09:46 +02:00

This is probably a side-effect of D5191: Alembic: import & export face-varying normals. I guess this has always been an issue in the export, but now that we import correctly it's showing up. I'll have to investigate.

This is probably a side-effect of [D5191: Alembic: import & export face-varying normals](https://archive.blender.org/developer/D5191). I guess this has always been an issue in the export, but now that we import correctly it's showing up. I'll have to investigate.

Sybren A. Stüvel commented

2019-10-17 12:11:57 +02:00

Closed as duplicate of #69182

Sybren A. Stüvel closed this issue

2019-10-17 12:11:57 +02:00

Sybren A. Stüvel commented

2019-10-17 12:12:39 +02:00

This was indeed the same thing as #69182; it turned out it had nothing directly to do with varying topolgy

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Alembic cache of Cloth Sim unaffected by Smooth/Flat shading. #70710