Tutorial

Part 1: Creating GameObjects to Detect Raycast Intersection

First, we create an array of GameObjects (any object that inherents a Transform) for anything we want to be detected by Raycasts.

Part 2: Contstructing a Bounding Volume Hierarchy

Then, we pass this array of created GameObjects into the constructor for the HeirarchicalVolumeManager object to create a Bounding Volume Hierarchy (BVH).

This builds a BVH and organizes all of the passed GameObjects into the tree. Now searching for raycast interception is a lot less costly (before searching would take O(n), but now its averaged at O(log(n))).

Part 3: Casting Rays

To cast a ray, we first create a new Raycast object and then provide the start point and end point of the raycast (in World Coordinates [x,y]).

To check if the raycast has intercepted any objects just call the update(headNode) function to get a list of all the objects it intercepted.

Now we can use this array of intercepted GameObjects and use them in any way we wish.