Lawa wrote

I don't think you understood what I'm trying to do here ..
for example lets say I have this in display() method :
gl.glBegin(GL2.GL_POLYGON);
gl.glVertex2i(0,0);
gl.glVertex2i(0,100);
gl.glVertex2i(100,100);
gl.glVertex2i(100,0);
gl.glEnd();

basically this is a rectangular shape (or any other shape) created using the basic methods of JOGL how do I implement physics engine to this particular shape ?

class MyGameEntity {
  int[] vertices = [0,0 0,100, 100,100, 100,0] ;
}

...

class RenderableThing {
   MyGameEntity drawThis ;

...
   glVertex2i(drawThis.vertices[0], drawThis.vertices[1]) ;
   glVertex2i(drawThis.vertices[2], drawThis.vertices[3]) ;
}

class PhysicsThing {
  MyGameEntity makeThisPhysical ;

  public void addToPhysics(World world) {
    Body b = new Body(new BodyFixture(new Rectangle(//calculate the width & height from the makeThisPhysical object))) ;
    world.add(b) ;