Hey everyone,

I'm doing a project where I modeled a canyon with a little riverbed. I have particles coming down from the canyon and slide into and down the river. I will make the particles into a particle fluid surface when I can get the motion right. My problem is that the particles eventually slide back up the canyon walls and out of the river again… water doesn't do that. There has to be some sort of expression I can write to make it look like the water is flowing down the river instead of up the sides.

Any kind of solution would be appreciated. I've attached my file for anyone who wants to have a look!

Hey Wintergreen,


You could cheat and change the behavior to bounce and then lower the Gain Normal to something like 0.3. This will still give you your sliding particles.


good luck on your project