There were two threads very recently regarding Bullet and, among other issues,
about exactly this one.
The thing is that the bullet exporter interprets the grid as a solid box, and
that has a minimum thickness as it seems. Give your grid some thickness, or
make a box in the first place and particles will collide better.
You will still run into other problems though, have a look at these two threads:
"Simulate RBD and Simulate Bullet RBD issues", starting Aug. 2nd 2012
and
Particle collision behaves differently after particle count > 4000, starting
Aug. 7th 2012
Chris Chia and gang promised to look into it, don't know the current status or
when a fix is available.
Hey guys two questions about Bullet particle solver in Softimage.
1. Is it me or does it slows down MASSIVELY, but I mean really SUBSTANTIALY
when a actual shape deforming collider is used?
2. Is there anyway to control collision offset? A simple torus falling on a
grid and it is like a quarter of a SI unit or something apart, looking
quite bad in the render...
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