Problem with collisions

Troubleshooting physics
1

i have a problem whit collisions, when my character collides with a big object all is fine, but when my character collides with a small object the fps descrease drastically, and my game run very slow.

some screenshots:

an big object like atree.

an samll object like a mushroom.

and my code for my static models:
[java]
public void cargarModelosEscenario(String idEscenario){

     controladorBaseDatos controladorBD= new controladorBaseDatos();
     Modelo[] modelos=controladorBD.obtenerDatosAmbientePorEscenarioBD(idEscenario);
      for(int modeloActual=0;modeloActual<modelos.length;modeloActual++){
            Spatial modelo=assetManager.loadModel(modelos[modeloActual].getModeloXML());
            CollisionShape sceneShape = CollisionShapeFactory.createMeshShape((Node) modelo);
            RigidBodyControl landscape = new RigidBodyControl(sceneShape, 0);
             modelo.addControl(landscape);  
             bulletAppState.getPhysicsSpace().add(landscape);
         }

nodoPadre.attachChild(modelo);
}
[/java]

my code for my character:
[java]
private CharacterControl controlNPC;
private Node nodoPrincipal= new Node();
private Spatial npc ;

public void simpleInitApp() {   

bulletAppState = new BulletAppState();
bulletAppState.setThreadingType(BulletAppState.ThreadingType.PARALLEL);
stateManager.attach(bulletAppState);
                ....
                ....

}
private void cargarNPC(){
npc = assetManager.loadModel("Models/otromesh/Cube.002.mesh.xml");
Material material = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
material.setTexture("ColorMap", assetManager.loadTexture("Textures/madera.jpg"));
npc.setMaterial(material);
npc.setLocalTranslation(-100f, 5f, 10f);
npc.scale(.15f);
nodoPrincipal.attachChild(npc);

npc.addControl(controlNPC);
  bulletAppState.getPhysicsSpace().add(controlNPC);

}

 private void crearFisicaNPC(){              //agregando  fisica al bicho------------------------------
CapsuleCollisionShape capsuleShape2 = new CapsuleCollisionShape(1f, 0f, 1);

controlNPC = new CharacterControl(capsuleShape2, 1f);
controlNPC.setJumpSpeed(20);
controlNPC.setFallSpeed(30);
controlNPC.setGravity(30);
npc.addControl(controlNPC);
bulletAppState.getPhysicsSpace().add(controlNPC);
}
[/java]

if i resize my mushroom to make it biger, it work fine.
if many objects collide with my character i have the same problem.

i hope somebody help me, and sorry for my bad english.

2

[java]CapsuleCollisionShape capsuleShape2 = new CapsuleCollisionShape(1f, 0f, 1);[/java]

your character has 0 height :-/

I also suggest you use:

[java]bulletAppState.getPhysicsSpace().enableDebug (assetManager);[/java] so that you can see your collisionshapes in more detail.

Bullet has a hard time with collisions involving very small triangles

3

a low performance is normal?

a screenshot:

4

is your first issue solved?

It depends on your hardware, you have 375 objects, try lower that by batching

5

i need increase the perfomance when my character cillide with small objects,
Is there any way to increase the size of the triangles?

6

That’s only really an issue for your original post (in physical collisions), but using simpler collision shapes would help regardless

Also:

@wezrule said: you have 375 objects, try lower that by batching
7
@eypidemik said: i need increase the perfomance when my character cillide with small objects, Is there any way to increase the size of the triangles?
Just don't wrap them with a mesh. Mark them with UserData or something and then make them boxes or hulls or something similar.
8

Mark them with UserData? i don’t understand that.

9

thanks i used boxshape for small objects