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jPCT - a 3d engine for Java => Support => Topic started by: fireside on February 20, 2008, 06:13:02 am

Title: Collision not working
Post by: fireside on February 20, 2008, 06:13:02 am

I tried doing a search for collision and came up with this function for the mouse:

Code: [Select]

private void doGravity()
{
      SimpleVector msPos=Mouse.getTransformedCenter();
      msPos.add(msHgt);
      if(world.checkCollision(msPos, dr, .6f)== Object3D.NO_OBJECT)
      {
    Mouse.translate(gravity); 
      }           
}
private void move()
{
SimpleVector a = Mouse.getZAxis();
a.scalarMul(-.15f);
a = Mouse.checkForCollisionEllipsoid(a, elipse, 2);
Mouse.translate(a);
}
The gravity part works, but the mouse walks through as in this picture:
(http://aycu38.webshots.com/image/42837/2002542622528098855_th.jpg) (http://allyoucanupload.webshots.com/v/2002542622528098855)

The elipse is (2,5,2)  The five is the mouse height and works for gravity.

The platform is set for collision with this code:

Code: [Select]

    platform.setCollisionMode(Object3D.COLLISION_CHECK_OTHERS);
    platform.setCollisionOptimization(Object3D.COLLISION_DETECTION_OPTIMIZED);
I tried setting collision for the mouse but it didn't help.  I had to use -.15 in the scalermult or else the mouse went backwards.

Title: Re: Collision not working
Post by: EgonOlsen on February 20, 2008, 08:11:54 am

Does the mouse starts in that location or is he in front of that block in the beginning?

Title: Re: Collision not working
Post by: fireside on February 20, 2008, 08:20:53 am

He's in front of the block and walks right through it.

Title: Re: Collision not working
Post by: EgonOlsen on February 20, 2008, 08:34:24 am

How much in front? Make sure that the ellipsoid doesn't intersect with the block at the beginning, because the ellipsoid collision detection is a collision avoidance algorithm. It can't resolve an existing collision.

Title: Re: Collision not working
Post by: fireside on February 20, 2008, 08:36:12 am

Way in front.  He starts at the middle of the platform.  And I can walk him all the way to the other side, turn around, and he goes through.  I know the block is doing collision.  It's combined, but I can drop the mouse from high up and it will stop on top the block if I move him over to where the block is when the program starts, so the move function isn't working for some reason.

Title: Re: Collision not working
Post by: EgonOlsen on February 20, 2008, 08:47:27 am

And the mouse is set to COLLISION_CHECK_SELF?

Title: Re: Collision not working
Post by: fireside on February 20, 2008, 09:00:22 am

Ha, you beat me to it.  I just tried that.  That's what it was.