GImpactCollisionShape creation failure

Troubleshooting physics
1

Hey monkeys,

first of all:
If you don’t think I should use a GImpactCollisionShape, you can look at this thread.

Now to the actual problem.
I have a model and want to create a GImpactCollisionShape out of its mesh.
But when I do that, the GImpactCollisionShape is scaled way bigger than the original model.

In order to clarify I made a little non-working example:
[java]
// load model
Node model = (Node) assetManager.loadModel(“Models/airship_tiger_physics.j3o”);

// get model mesh
Mesh mesh = ((Geometry) ((Node) model.getChild(“physics”)).getChild(“mesh1”)).getMesh();

// create GImpactCollisoinShape
GImpactCollisionShape collShape = new GImpactCollisionShape(mesh);

// create RigidBodyControl
RigidBodyControl control = new RigidBodyControl(collShape, 0);

// link model and control to each orther, physicsSpace and rootNode
model.addControl(control);
bas.getPhysicsSpace().add(control);
rootNode.attachChild(model);
[java]

I use the same model to display in the world and to generate the GImpactCollisionShape and I don’t do any scaling.
When I look at the physics debug shape and test it with other rigidbodies I discover that they are not the same size at all.
Any suggestions on why it is like that and how to fix it?

Thanks in advance!

2

Oh man.
You work hours trying to get a solution and soon after you ask you find it yourself. =D

Anyways, if anyone is curious or has the same problem in the future:

When you create a model with blender and convert it to .j3o there are a bunch of Nodes and some of them may have some scaling.
So you can’t simply use the mesh.

When I tried to set the scale of the geometry to the GImpactCollisionShape it didn’t work but I didn’t investigate very much tbh.
If you export the .blend in .obj (and then to .j3o) however, it works fine.

3

gimpact ignores scale of nodes, you can however sale it directly, using a somehow calcualted scale you need.