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I was following a tutorial for making a realistic chain where you use Rigid Body Physics to make a chain fall on a plane. I'm trying to use this technique in one of projects, but I can't get it to work. I tried doing the tutorial in a new project and it still didn't work.

I am using torus objects and duplicating them to make a chain. I select all of the objects and go to the "Physics" tab in the Tool Shelf (T menu) and press "Add Active". I then go to the "Change Shape" drop down and choose "Mesh". When I play this it takes forever to simulate, and about 4 frames in, the links in the chain start to separate as they fall. I want them to stay together (which works fine when I do this in a new project using only the chain mesh).

enter image description here

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    $\begingroup$ Have you applied the scale with [Ctrl]+[A]? Also try scaling everything up (and then applying the scale again). $\endgroup$ – PGmath Aug 23 '15 at 0:50
  • $\begingroup$ What does the scale do? I just selected all the links in the chain and pressed Ctrl+A and the pressed scale. After that I chose add active, then changed the shape to mesh and they still fell apart :( Thanks for your comment though. Something is going on here because this works fine when I do it in a new project. When I add it to this project it just doesn't work and I can't find out why. $\endgroup$ – Josh Firicano Aug 23 '15 at 0:58
  • $\begingroup$ See here for more on applying scale. Did you try scaling up the chain links? $\endgroup$ – PGmath Aug 23 '15 at 1:00
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Try making your chain links dramatically bigger. Blender has a problem with small objects with rigid body physics. Hope this helps!

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  • $\begingroup$ WOW that worked. That really sucks though because it looks ridiculous with chains that large. Thank you for figuring this out though. $\endgroup$ – Josh Firicano Aug 23 '15 at 1:00
  • $\begingroup$ You just need to move your camera farther away and also zoom out your view alot. When working with Rigid Body, get ready to make everything on a larger scale. :) $\endgroup$ – jo99blackops Aug 23 '15 at 1:02
  • $\begingroup$ P.S. Please mark my answer as your answer if it worked :). $\endgroup$ – jo99blackops Aug 23 '15 at 1:03
  • $\begingroup$ I actually found a work around. I just scaled the chain back down after it fell. Thanks so much for the info! $\endgroup$ – Josh Firicano Aug 23 '15 at 1:03
  • $\begingroup$ I'm glad it worked! $\endgroup$ – jo99blackops Aug 23 '15 at 13:14

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