e resulting value is not zero, the objects are allowed to
	collide.
</p>

<h4 id="raycast">
	Raycast
</h4>

<p>
	Useful for poking things, selecting objects. A raycast constructs a ray 
	between two points and check whether it intersects any rigidbody between
	these points. If an intersection is found, it is returned.
</p>

<h4 id="shapecast">
	Shapecast
</h4>

<p>
	Similar to raycast, but instead of a checking an intersection with an
	infinitely thin line, a shape is used. 
</p>

<h2>
	Collisions: how do t