I have tried this a few times and have looked through the manual but I can't seem to get it to work right. I inserted a particle emitter, rotated it 180 degress and stuck it on the ceiling. I then placed a sphere midway between the emitter and the floor. When I scrub the slider I want the particles to bounce off (deflect) off the ball and then hit the floor. But, right now they just pass throught the ball on their way to the floor. Can someone guide me here? I looked in the Porperties panel with the sphere selected but can't seem to find anything. Thanks, Chris

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According to litst (one of the C2 beta testers), particles only collide with the floor. You can read his answer at the attached link. It's 3rd from the bottom.

Thanks...read the post. Man that stinks! I wonder if there is a wrokaround...like making C2 think the object is the floor? Oh well, thanks for the link, Chris

You can half cheat. You can set the floor elevation to be the same elevation of the ball and then put another particle emitter in the ball and set it to emit particles that look like they're bouncing off. From what I've seen, the floor elevation in C2 is selectable. From a distance it may look ok but no way close up. -Kix

-Kix

Thanks Kix...is there suppose to be particle collision with objects in C2? What I mean is, is it a bug, and that's why it doesn't work with objects? Chris

As far as I know, particle collision doesn't work with any objects other than the plane specified by the floor. I also think that if you drop the particle emitter below the specified floor elevation for the emitters local coordinates, it won't spew any particles (at least that's something I figured when I was trying to nail down the bugginess of it on the Wintel boxes). Collision with all objects would be VERY cool but I just don't think they've cooked it up yet. Someday. -Kix

-Kix

Kix, Thanks for the reply! Chris

Just an idea...I'm not home to try it or check the specifics of each task... Tweak your particles lifespan so they 'die' while they're inside the ball. That way they won't be seen coming out of the bottom of it. Create a second particle emitter just above the surface of the ball, pointing towards the first emitter. Tweak that emitter so its particles come out at the right angles and velocity so they look like they're bouncing. Constrain the second emitter to point at the first one. The rest you'll need to do manually. Keyframe the second emitter's position so it shows up on the right part of the ball, and keyframe the first emitter so you can change the particles so they don't die too early or late (depends on how far up and down the ball is moving). You shouldn't need tons of keyframes unless the ball is on the screen for a long time or moving around wildly. This could give you a passable look of particles bouncing off of the surface of the ball.