Physics doesn't work on preloaded models

Troubleshooting physics
1

Hello, my name is SeySayux, I'm new to these forums so I hope I'm doing everything all right. Excuse me for my English, I'm not that good at it.



I've some problems with the physics engine. It seems I cannot use physics on a model thats loaded.



I'm loading a .jme model (at least, it was a .3ds model, but i converted it) as the terrain for my game. Next I've tried to tell the physics engine to make the terrain a static node. I told it to generate a physics geometry, but then I got this error:


Illegal argument exception: scale shouldn't be 0



It seems to happen in a ODE class (i don't know the exact class anymore, but if you need it, I'll search for it)

Next i tried to make a physics mesh for each TriMesh inside the model (using PhysicsMesh.copyFrom()) but then the engine ignores the model.

Does anyone know what to do?

PS. if you need a method used in my game, I'll be happy to post it
2

Make sure your model does not contain any geometries with a 0 component in scale (e.g. [1, 0, 1]). As you'd want to generate geometries for a terrain make sure to pass triangleAccuracy == true. Using loaded models should be working fine.

3

How do I do this? I don't believe the scale is a problem (the terrain is showing up fine)

4

I tried to replace

gamemap.setLocalScale(.1f);


with

gamemap.setLocalScale(new Vector3f(.1f,.1f,.1f));


but I still get this exception:

java.lang.IllegalArgumentException: scale must not have 0 as a component!
        at com.jmex.physics.impl.ode.geometry.OdeBox.updateWorldVectors(OdeBox.java:69)
        at com.jme.scene.Spatial.updateWorldData(Unknown Source)
        at com.jme.scene.Spatial.updateGeometricState(Unknown Source)
        at com.jme.scene.Node.updateWorldData(Unknown Source)
        at com.jme.scene.Spatial.updateGeometricState(Unknown Source)
        at com.jme.scene.Node.updateWorldData(Unknown Source)
        at com.jme.scene.Spatial.updateGeometricState(Unknown Source)
        at SRBase.initGame(SRBase.java:308)
        at com.jme.app.BaseGame.start(Unknown Source)
        at game.main(game.java:41)
Exception in thread "main" java.lang.NullPointerException
        at SRBase.cleanup(SRBase.java:395)
        at com.jme.app.BaseGame.start(Unknown Source)
        at game.main(game.java:41)



I don't know how to pass the triangleAccuracy thingy.
5

The parameter to generatePhysicsGeometry must be true to use triangle accuracy.



The problem is not the local scale of your node but of some geometry. Have a look at the scales in you modeling application.

6

Ahem… can anyone help me?.. please?..

7

I already solved it myself. I replaced the planes (JME quads) which built up the terrain with very thin boxes. I think 3DS doesn't save a Y scale value of planes.



PS. Thank you very much irrisor, for all the help (little bit sarcasm  }:-@)

8
SeySayux said:

PS. Thank you very much irrisor, for all the help (little bit sarcasm  }:-@)

I don't think that sarcasm is in any way appropriate. But if you feel better now, that's fine for me :) - glad you found the problem in your model
9

Yea, thats true  XD. But anyways, this problem is solved, and it's solution opens a way to… tons of new problems.