Cell Fracture Collision Problem

I’ve been trying to setup a simple physics sim using a cube knocking into a subsurfed cube that has been cell fractured to break apart. However when I run the simulation is appears to be fine but when I have the simulation recorded the cell fracture breaks apart before the cube actually touches it. I cannot figure out why I have tried a lot of stuff, the frame rate is the same both playback and game engine set at 24 fps. Does anyone know why this might be happening and how to fix it?

Here is an example of the collision before the block actually hits.

I don’t really know why that is, but you could always just use the dope sheet, and align the keyframes there :slight_smile:

Thanks for the tip but I’d like to figure out why this is happening as well.

You should make sure to start the simulation at the first frame, and also try to change that to 0,
I’ve been having some problems with the 23,976 famerate, so if you’re using that, try and change it to just 24

and if you haven’t already, go watch this quick tutorial series about cell fracture

I was watching that series when setting up this test and I just cannot replicate the results I don’t know why but I’ll try what you suggested.