Another quicky,
Pretty much the same setup as vimeo.com/17681995. I added a bit of windshield cracking for the flair...
Next step: Implementing dynamic blend material using the inter-collision information written into a vertex color map. That way the material changes from car paint to scratched where ever the rock hits.

further explaination here:
orbaz.com/visualguide/particleflowtools/box2/PSkinner_ChannelPaint.html

Admittedly the collision is not clean since the car is inside a voxelised box and not an accurate restricted volume...but you get the idea.

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