Deforming erosion in sops

[bandini]

Hey there,

A bit of a technical challenge...

I have a deforming object that is being turned into a volume for eroding. I am subtracting surface from the object iteratively in a solver SOP, using some procedural volume noises in a volume vop. That's all good, unless my object is deforming (which it is). I need a little help figuring out how to get the noise to stick with the object as it deforms.

Any ideas or sample hip files you can share?

Thanks!

Adam

Edited July 26, 2013 by bandini

[pbarua]

You can use attributecopy SOP to copy attribute from Prev_Frame to Input_1 inside solver SOP.

That's solution if I'm getting your problem correctly.

[bandini]

Thanks, Pradeep, but I don't think that solution works for volumes.

In any case, I switched my approach and have a non-volume method I am working with now that seems promising.

[Follyx]

Bump for a sample file please.

[breadbox]

not exactly sure if this will work, but what about setting a rest state, or first frame of the deformation, then calculate your noise on those points. store those as attribute values and re-copy those to point positions onto deforming mesh.

its hard to say exactly without a file or example showing what you are trying to do.

[Follyx]

@bredbox: I dont understand your approach. What do you want to handle with a texture alignment? Wich does not mean however that it dont work, I just dont understand the approach.

Cheers

[breadbox]

I don't think I was suggesting a texture based approach but now that you mention it, that could also work. its a similar problem when you try to use a 3D procedural that the textures will swim as the object moves/deforms through space. The solution is to find something that can be constant, that doesn't move or change. A UV approach (because UV's don't move as the object deforms) or to create a static version (rest state - pre deformation) of the model that the deforming geo can reference back to as some kind of look up.

I'm not sure I'm understanding the original posters question though. I'm pretty sure he would have thought of this

[Follyx]

sounds obvious; tried it: work!!

Never thought about to use it ulterior. That I have to learn as newbie in Houdini not to be fixed with my thougts...

Thanks for the news.

Cheers

Edited October 20, 2013 by Follyx