fluid collision

[SElsner]

Hello everybody,

first post here ad odforce! Found this to be a good source for information. I recently got into Houdini (mainly modeling and textures) now I'm on my first dynamics assignment for a friends diploma project. I need to create an oily fluid which collides with a doorstep (see attachment). Now I am asking myself what would be a good approach for collision. Volume gives me strange shapes to collide with (I know it only works with closed sufaces). Am I better off building the step and the door as different objects or would you only use Surface collision (which is faster, because there's not so much overhead with volume geo, that doesn't collide)?

Thanks

Sebastian

[Ratman]

You can't use flat surfaces for collisions, needs depth.

You can extrude it in.

[SElsner]

But that would add a lot of overhead to test collision against?1 What about using Surfaces only (I don't need collision for that, right?)

[wolf_cub_one]

Since your scene seems simple, just use four boxes for collision objects. It fast and accurate enough for what you need.

HTH

[SElsner]

Ok I'll just try it and will come back, if I have another question.

[mabulazm]

you can use Terrain Object SOP to give you the depth you are looking for.