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I'm trying to make an object fall to the ground and shatter. The object is already fractured using the cell fracture add-on.

But in the beginning of the simulation the object is exploding to pieces. What I want is the object falling and when it hits the ground, it should break apart.

enter image description here

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To touch on why your object your object is exploding at the beginning of the animation, check the Collision Margin in the properties panel>physics>rigid body>rigid body tools tab.If it has been changed at all, this can affect how the simulation works. enter image description here

If the collision margin sensitivity is ticked on and too high, (1 is the maximum) the fractures are literally pushing away from each other, thus the object explodes right away. Creating the effect you're looking for will take just a few steps:

  • Step one is of course to fracture your object, in my example .gif below I used a sphere.

  • Step two is to add rigid body physics. Delete the object on layer one, and move the fractured object from layer two to layer one, or just work on layer two. Select one fracture, go to the tool panel>physics tab and click on add active.

enter image description here

  • Next, select all of the fractures and click on copy from active.

enter image description here

  • Now you need to add a collision object, so that the fractured object has something to shatter against. Add a plane and go to the physics settings in the tool panel again, and click add passive.

enter image description here

Now, drag the fractured object to the height you want it to fall from, and press Alt+A, and something like this should happen:

enter image description here

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    $\begingroup$ Brilliant, the sensitivity margin solved the problem. I lowered it from 0.04 to 0.01 and now it behaves as I want. Thanks! $\endgroup$ – wout Feb 7 '16 at 10:14

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