Mesh Deform Issue with Collision-less Cloth Cage and Object with Collision #66267

New Issue

Craig Dolphin · 2019-06-30T08:54:11+02:00

Craig Dolphin commented

2019-06-30 08:54:11 +02:00

System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce MX130/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.25

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-28 22:08, hash: 648e8a1f1d
Worked: (optional) 2.79

Short description of error
I have an object with a mesh deform modifier and collision physics enabled on the object.
The cage has cloth physics applied to it, but collisions are unchecked in the physics panel for the cage.

When I move cage vertices, the object mesh does not move at all and I get:
ERROR (bke.modifier): c:\b\win64_cmake_vs2017\win64_cmake_vs2017\blender.git\source\blender\blenkernel\intern\modifier.c:410 modifier_setError: Cannot get mesh from cage object
in the console.

If I specify an empty collection in the greyed-out collision collection field of the cage cloth physics, then the mesh deform works as expected.
Or if I remove collision physics from the object, the mesh deform works as expected.

It seems as if there is some kind of dependency issue between the cloth and the collision physics, even though the cloth sim has the collision checkbox unchecked, and all collision related fields are greyed out.

I can work around this but it is confusing to have cloth physics encountering issues with colliders when collisions are turned off in the cloth sim and all collision fields are greyed out.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

mesh_deform.blend
Open the blend file.
Select the cage in edit mode and apply a transform such as scale to it.
The inner cube should deform with the cage but it doesn't.

Workaround 1.
Disable collision from the inner cube and retest -> The inner cube transforms as expected.
Re-enable collision on the inner cube - >mesh transform stops working.

Workaround 2.
Select the cage and view the physics tab >collision panel.
Note that collision is unchecked and the collision collection field is greyed out.
Select Collection 2 in the greyed out field.
Retest -> The inner cube now deforms as expected when collision is applied to the inner cube..

In 2.79, mesh deform worked if collision was disabled in cage cloth sim, and collision physics were applied to object.

**System Information** Operating system: Windows-10-10.0.17134 64 Bits Graphics card: GeForce MX130/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.25 **Blender Version** Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-06-28 22:08, hash: `648e8a1f1d` Worked: (optional) 2.79 **Short description of error** I have an object with a mesh deform modifier and collision physics enabled on the object. The cage has cloth physics applied to it, but collisions are unchecked in the physics panel for the cage. When I move cage vertices, the object mesh does not move at all and I get: ERROR (bke.modifier): c:\b\win64_cmake_vs2017\win64_cmake_vs2017\blender.git\source\blender\blenkernel\intern\modifier.c:410 modifier_setError: Cannot get mesh from cage object in the console. If I specify an empty collection in the greyed-out collision collection field of the cage cloth physics, then the mesh deform works as expected. Or if I remove collision physics from the object, the mesh deform works as expected. It seems as if there is some kind of dependency issue between the cloth and the collision physics, even though the cloth sim has the collision checkbox unchecked, and all collision related fields are greyed out. I can work around this but it is confusing to have cloth physics encountering issues with colliders when collisions are turned off in the cloth sim and all collision fields are greyed out. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] [mesh_deform.blend](https://archive.blender.org/developer/F7556740/mesh_deform.blend) Open the blend file. Select the cage in edit mode and apply a transform such as scale to it. The inner cube should deform with the cage but it doesn't. Workaround 1. Disable collision from the inner cube and retest -> The inner cube transforms as expected. Re-enable collision on the inner cube - >mesh transform stops working. Workaround 2. Select the cage and view the physics tab >collision panel. Note that collision is unchecked and the collision collection field is greyed out. Select Collection 2 in the greyed out field. Retest -> The inner cube now deforms as expected when collision is applied to the inner cube.. In 2.79, mesh deform worked if collision was disabled in cage cloth sim, and collision physics were applied to object.

Craig Dolphin commented

2019-06-30 08:54:11 +02:00

Added subscriber: @CraigD

Philipp Oeser commented

2019-07-01 11:00:51 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-07-01 11:00:51 +02:00

This dependency cycle is reported:

Dependency cycle detected:
  OBCube/Geometry Component/GEOMETRY_EVAL() depends on
  OBCage Cube/Geometry Component/GEOMETRY_EVAL() via 'Mesh Deform Modifier'
  OBCube/Geometry Component/GEOMETRY_EVAL() via 'Cloth Collision'
Detected 1 dependency cycles

However, this indeed shouldnt be neccessary in the case when collisions are disabled, checking...

This dependency cycle is reported: ``` Dependency cycle detected: OBCube/Geometry Component/GEOMETRY_EVAL() depends on OBCage Cube/Geometry Component/GEOMETRY_EVAL() via 'Mesh Deform Modifier' OBCube/Geometry Component/GEOMETRY_EVAL() via 'Cloth Collision' Detected 1 dependency cycles ``` However, this indeed shouldnt be neccessary in the case when collisions are disabled, checking...

Philipp Oeser self-assigned this 2019-07-01 11:28:02 +02:00

blender-admin commented

2019-07-01 11:32:10 +02:00

This issue was referenced by 67fc4f4bed

This issue was referenced by 67fc4f4bedded86a04d2bf98ca1642a12d9662b3

Philipp Oeser commented

2019-07-01 12:34:13 +02:00

Changed status from 'Open' to: 'Resolved'

Philipp Oeser closed this issue

2019-07-01 12:34:13 +02:00

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Mesh Deform Issue with Collision-less Cloth Cage and Object with Collision #66267