ERROR in the colision

Troubleshooting General Help
1

hi,





i made the colision teste in my game, but is identified colision when the models are still distant…



my code:




           public boolean colision (Node Modelo)
    {
        CollisionTreeManager.getInstance().setTreeType(CollisionTree.Type.AABB);
        CollisionResults results = new TriangleCollisionResults();
       
        for (int i=0;i<node.getChildren().size();i++)
        {
            if ( ! Modelo.getName().equalsIgnoreCase(node.getChild(i).getName()) )
            {
                results.clear();
                Modelo.findCollisions(node.getChild(i), results);
                if (results.getNumber() > 0);
                    return true;
            }
        }

        return false;

    }



whats the problem?
2

Is this part of code doing what you want ?


                if (results.getNumber() > 0);
                    return true;

3

No, this “;” I accidentally put in the code …



There is no syntax error in my code … my problem is that my function accuses collision between objects just before the objects collide … I put a picture of what is happening:









This message box appears when my function returns true …

4

The collision is based on the BoundingVolume of your spatial. If it is a sphere, it is probably bigger  than the box itself…

5

I changed to BoundingBox and still the same error …


s = new Box("s",new Vector3f(0,0,0), 5,5,5);
       s.setLocalTranslation(0,0,0);

        BoundingVolume b = new BoundingBox();
        s.setModelBound( b);
       s.updateWorldBound();
       s.updateModelBound();
       s.updateRenderState();

   s2 = new Box("s2",new Vector3f(0,0,0), 5,5,5);
       s2.setLocalTranslation(-20,0,0);
        s2.setModelBound(b);
       s2.updateWorldBound();
       s2.updateModelBound();
        s2.updateRenderState();



I have to give volume for boudingBox? What do I do?
6

Are you using SimpleGame? If yes you can show the BoundingVolumes by pressing B.



I think your problem is that getNumber() will not help you here. As far as I know you have to check if there are really triangle-hits



add something like this before returning true:


      for (int i=0;i<results.getNumber();i++)
      {
         if (results.getCollisionData(i).getTargetTris().size()>0)
            return true;
      }



Maybe you should use a different approach:

if (b1.hasCollision(b2, true)) return true;



the "true" in the hasCollision-method means trianglecollision yes/no

good luck...collision-detection is able to make you crazy (I'm having some issues at the moment as well)
7

Perfect!



I used the first way you said and it worked perfectly!



thank you very much!