3dsmax7: HELP on a reactor problem

[martinpe]

hi everyone,

I've a big problem. I've just modelled a coat for a character. Right now, it's unanimated, because I want to animate it as a real coth using reactor. But now, I've got a big problem. The moment i want to generate a preview, it says, that the 2 objects have interpenetrations, meaning that they are connected together somehow. I tried to look at every vertex, but no luck, every vertex IS SEPERATED.

I tried a little experiment, where I created 2 tubes, a big one and a very long thin one. I wanted to generate a preview with reactor: the big tub shall be a rigid body, the other one a cloth. The thin tube is inside the hole/space of the big one and now here cames exactly the problem: Altough the 2 objects DO NOT TOUCH each other, I still get the problem, that they are interpenetrated. How's that possible, if they are separeted from each other? Oh man!

:*poly: Where is the problem?
:*poly: How is that possible, that the warning (interpenetration) comes up although they are both separared from each other?
:*poly: How can I solve this?

I've attached a *.max file with the 2 tubes so you can see for yourself.

Try the experiment for yourself:
*If you move the thin tube out of the big one's hole/space, reactor works fine.
*But the moment the thin tube touches the big one's hol/space, it get's "interpenetrated"

Can somebody help me here please?

[MaggieQue]

U can select both of the tubes, then use Open Properties Editor, select Concave Mesh. Then use Analyze World, let the software check whether there's interpenetration.

[MaggieQue]

At Simulation Geometry roll out, there are Bounding Box, Bounding Sphere, Mesh Convex, Concave Mesh, etc.

When u have a model, which is a

Box: use Bounding Box
Sphere: use Bounding Sphere


Mesh Convex Hull: it looks like wrapped by cling wrap, imagine u have a teapot which is wrapped by a piece of large plastic tightly. If u have a tube goes into teapot handle, no vertices goes into the teapot, but the Analyze World will still say "Interpenertrating!!!!"

Concave Mesh: for plane, cloth, or when u want a tube goes through the teapot handle hole, or u want to use exactly the mesh shape of the model.


Proxy Convex Hull/Concave Mesh:
If u have a high polygon count model, then u model another low polygon model as a physical representation. So the low polygon one will be the proxy (representation) of the actual model.

If u are animating a lot of teapots pouring from a box onto floor. We could use:

Bounding Box/Sphere/Mesh Convex Hull/Concave Mesh for the teapots
Concave Mesh for the box (because it's a container)
Concave Mesh for ur planar floor.


Maybe u could take a look the max help file: Rigid Body Properties

[martinpe]

Yeah, that does it.

But what if I have a character? I can't modell a low-poly-version of it, that'll take forever. Any ideas or ways how to decrease the amount of polygons/vertecies on a character?

[MaggieQue]

How abt MultiRes modifier?