Moving a particle over a poly shape

[jfhtx]

Hi,

I'm rather new with Houdini but I just try to achieve one thing with paticles.

I saw different post with sliding,creeping,cling,prim,primuvu,..ect for moving a particle over a surface.

I tried all those things on a low poly human shape and it works but the motion of the particle is random over the surface.

So my question is :

is it possible to move one particle all over a surface in a smooth way so I can simulate with the trail surface node a kind of wollen wire shape?

I tried to use the Position particle node but with different functions like sin and cos...but it doesn't work.

Any light to help me ?

thank you

[mightcouldb1]

Maybe this thread by eetu will help you:

Particularly the file titled ee_sdf_voppop.hip

Jason

[3__]

See attached.

Only works if target geometry has gapless, non-overlapping UVs.

Spanning isn't handled in this file; Its where the lack of procedural

edge grouping (including curve segments) starts to hurt.

partsonsphere.hipnc

[jfhtx]

Thank you Jason for the tip.

I tried with sdf and it was not better than the solution I found with different post to slide particle over a polygon shape.

I have a source->create posprim->create posuv->creep->drag->property for cling.

As you see the outcoming is quite what I was looking for.

But I would like to move the particles in a less random way

because some time the particle seems to stay in one place and don't move far away from that place.

I would like to position the particle and to find a way,so that particle will go all over the shape.

Edited February 24, 2010 by jfhtx

[jfhtx]

See attached.

Only works if target geometry has gapless, non-overlapping UVs.

Spanning isn't handled in this file; Its where the lack of procedural

edge grouping (including curve segments) starts to hurt.

Hi

I'm working on your great hip,it is I think what I'm looking for.

thank you.