Every time I use the rigid body tools I have a visible space between the passive object and the active object, even when I set the collision margin to very small or zero. Any suggestions?

  • $\begingroup$ What are you using the rigid body tools for when this happens? $\endgroup$
    – gandalf3
    Commented Oct 29, 2013 at 17:27
  • $\begingroup$ Can you upload your .blend or some screenshots? As it is now, we don't have enough information to do much more that speculate. $\endgroup$
    – gandalf3
    Commented Oct 29, 2013 at 18:19
  • $\begingroup$ The blend is here: pasteall.org/blend/24900 I usual use the Rigid body tools to drop items onto a surface or other basic use. It doesn't seem to matter how simple the scene is I still have this problem. $\endgroup$ Commented Oct 30, 2013 at 1:09
  • $\begingroup$ Ah, I thought you meant the rigid body tools panel in the 3D view T > Tool shelf. In the file you linked the backdrop still has a collision margin of 4cm and the monkey 0.1cm. $\endgroup$
    – gandalf3
    Commented Oct 30, 2013 at 1:57
  • $\begingroup$ that's my mistake I was only adjusting the collision margin of the dropped object not the surface, thanks:) I had no idea subsurf was affecting it though. $\endgroup$ Commented Oct 31, 2013 at 3:22

1 Answer 1


This seems to be caused by the Subsurf modifier on the Suzanne.

Frame 124 with the Subsurf modifier:

enter image description here

Frame 124 with the Subsurf applied:

enter image description here

In addition the Backdrop had a collision margin of 4cm, in the images above it is set to 0.

Comparison of frame 124 with the collision margin of the BackDrop set to 4cm and 0m:

enter image description here enter image description here

I also set the Collision shape of the Suzanne to Convex Hull and disabled Collision margin.

  • 1
    $\begingroup$ The reason for this is that currently rigid bodies only use the base mesh of the object. Things like modifiers and shape keys are not taken into account. In future versions it will be possible to select the mesh source. $\endgroup$
    – sergof
    Commented Nov 2, 2013 at 11:51

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