Bizzare collision bug

[Lukich]

I have a simplest particle system - a single particle emmitted from a location should bounce off the grid. The problem is that if the location is higher then 1.4 on the Y axis, the particle simply goes through the grid, which can be any distance away from the particle and origin. If the location is below 1.4, it'll bounce, stick or sing a happy tune depending on a setup, no problem. Did anyone encounter something like this?

Luka

[TheUsualAlex]

Would turn on "Geometry Moves with Time" help?

[edward]

I would assume you have animating geometry? First thing is to make sure you have the "Geometry Moves with Time" option turned on. After that, you can start tweaking the "Collision Tolerance" and/or "Bounce Accuracy" settings (slowly increase the numbers).

When all else fails, you can break down the grid into smaller sub-portions in order to improve the sampling. So instead of using a single Collision POP for the whole grid, use several Collision POPs instead on different portions of the grid.

[Lukich]

It would be too simple. The geometry is perfectly static.

[Lukich]

OK, I figured it out. It's not a matter of the distance. If the variance on the emitter is set to 0 and so is the Collision Tolerance. If any of them is non-zero, everything works perfectly.