function ShapeConfig(){

	    // position of the shape in parent's coordinate system.
	    this.relativePosition = new Vec3();
	    // rotation matrix of the shape in parent's coordinate system.
	    this.relativeRotation = new Mat33();
	    // coefficient of friction of the shape.
	    this.friction = 0.2; // 0.4
	    // coefficient of restitution of the shape.
	    this.restitution = 0.2;
	    // density of the shape.
	    this.density = 1;
	    // bits of the collision groups to which the shape belongs.
	    this.belongsTo = 1;
	    // bits of the collision groups with which the shape collides.
	    this.collidesWith = 0xffffffff;

	}
A shape configuration holds common configuration data for constructing a shape.
These configurations can be reused safely.

@author saharan
@author lo-th