Collision radius

[pbuckley]

I need some smart person out there to tell me - is there any way to tell a particles to collide at a certain radius form their centre points -
I have an animation where I have various blobby particles (threshold = 0) colliding with different pieces of geometry - all works well except the particles obviously don't rebound until they are half way through the centre of the particles

I know I can have non renderable geometry that surrounds my true geometry and use that as the collision object - but I have a lot of particles and objects all at various sizes and that's gonna get pretty messy.

Any ideas at all are greatly appreciated

[perseus2]

This isn't exactly what you're looking for and it's harder the more particles you have, but you can select the particle object and attach a radial force to it - in the forces menu you can specify "attach to object as source". This will give the particles the tendency to avoid each other and avoid your rigid bodies. Playing with the intensity and the attenuation of the radial field may give you the quasi-collisions you need.

[pbuckley]

I have done tests - using the technique you describe with mixed results - I found that if particles are moving towards the radial force at a fair bit of speed then you have to take the radial force up really high to stop the particles momentum, this then of course means that the force becomes way too powerfull for slower moving particles - lower conserve settings help but it all seemed a little too loose -
thanks very much for the suggestion though and the speedy response.
- I can't understand why alias haven't just given us the option of a collision radius or offset attribute.

[nicla]

i cant agree more with you pbuckley. Also that happens whent you want to fill a glas with bloody particles. It will never fill because particles will collide one on top of the other and there for will never fill it. Is really sad that they haven't fix that.

[algarra]

Check out liquid.mel at
http://www.splotsh.com/script.htm

Slow (with very few particles), but with zillions...

[nicla]

ok, i see but i cant get the script to work. No instrution or anything...by the way is there a "work around" to this major problem?