Softbodies with vertex groups misbehave #23214

Closed
opened 2010-08-07 01:28:26 +02:00 by Jacob F · 8 comments

Category: Physics

%%%r31120; Linux; nVidia 9400GT (256 driver)

Okay this one had me stuck for a while, couldn't figure out why my soft body wasn't being soft but I've finally found out why.

  1. Open .blend and press P (should play all fine)
  2. ESC then tab into edit mode on the cloth and add a vertex group
  3. tab to object mode and press P

Now it's misbehaving and jerking around and not being soft.%%%

**Category**: Physics %%%r31120; Linux; nVidia 9400GT (256 driver) Okay this one had me stuck for a while, couldn't figure out why my soft body wasn't being soft but I've finally found out why. 1) Open .blend and press P (should play all fine) 2) ESC then tab into edit mode on the cloth and add a vertex group 3) tab to object mode and press P Now it's misbehaving and jerking around and not being soft.%%%
Author

Changed status to: 'Open'

Changed status to: 'Open'

%%%Could you please attach an example blend?%%%

%%%Could you please attach an example blend?%%%
Author

%%%I seem to mention a .blend but I don't see one, so here's another.%%%

%%%I seem to mention a .blend but I don't see one, so here's another.%%%

%%%Only basic unmodified meshes will be properly converted to soft bodies, anything else likely suffers artifacts, as you reported.

Unless someone can fix this, we better document it somewhere that this is not supported.%%%

%%%Only basic unmodified meshes will be properly converted to soft bodies, anything else likely suffers artifacts, as you reported. Unless someone can fix this, we better document it somewhere that this is not supported.%%%
Member

%%%It appears that the problem is that the object ends up with a BL_MeshDeformer instead of a KX_SoftBodyDeformer if it has vertex groups. It seems the code assumes the vertex groups are going to cause deformation (a common use of vertex groups is for armature animation after all). This looks more like a Blender limitation than a Bullet one, so we should be able to do something about it. Not sure how to fix it though. Maybe having KX_SoftBodyDeformer subclass BL_MeshDeformer?%%%

%%%It appears that the problem is that the object ends up with a BL_MeshDeformer instead of a KX_SoftBodyDeformer if it has vertex groups. It seems the code assumes the vertex groups are going to cause deformation (a common use of vertex groups is for armature animation after all). This looks more like a Blender limitation than a Bullet one, so we should be able to do something about it. Not sure how to fix it though. Maybe having KX_SoftBodyDeformer subclass BL_MeshDeformer?%%%
Member

Added subscriber: @Blendify

Added subscriber: @Blendify
Member

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Aaron Carlisle self-assigned this 2019-06-29 02:15:36 +02:00
Member

This task is being closed because the BGE has been removed in Blender 2.8.

This task is being closed because the BGE has been removed in Blender 2.8.
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Reference: blender/blender#23214
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