Thank you for answers, they helped a lot.

Newest jPCT-ae release and you are right transformation matrix is null, but I don't know why. I do just translation and rotation in Y axis and ofcourse collision detection. Does it matter if I have logic and display in different  threads?

Hello,

I have encountered following problem:

Durring execution of this line:

model.checkForCollisionEllipsoid(sv, new SimpleVector(.5f, 1.0f, 0.5f), 3);

Sometimes exception is thrown:

01-09 23:10:49.590: E/AndroidRuntime(12805): FATAL EXCEPTION: Thread-11
01-09 23:10:49.590: E/AndroidRuntime(12805): java.lang.RuntimeException: [ 1326147049599 ] - ERROR: java.lang.NullPointerException
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.Object3D.getWorldTransformation(Object3D.java:2531)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.Object3D.getInverseWorldTransformation(Object3D.java:6494)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.Object3D.ellipsoidIntersectsAABB(Object3D.java:3633)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.World.doWorldCollisionEllipsoid(World.java:1933)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.World.doWorldCollisionEllipsoid(World.java:2046)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.World.doWorldCollisionEllipsoid(World.java:2046)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.World.checkSomeCollisionEllipsoid(World.java:1797)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.World.checkObjCollisionEllipsoid(World.java:1287)
01-09 23:10:49.590: E/AndroidRuntime(12805): at com.threed.jpct.Object3D.checkForCollisionEllipsoid(Object3D.java:2697)


I do not know what could be wrong - I try to catch it but the app crushes.

Any clues why does it happen?

Object is added already to the game world.