[1.11] Using frustum during client tick?

[OreCruncher]

I am looking at optimizing my mod a bit and one obvious place would be to avoid doing any analysis work on blocks that are not in the player's field of view.  My mod essentially scans a cuboid region around the player every few ticks or so and it stands to reason if I limit the blocks to what the player is looking at it would be more efficient.  So my question(s) are:

 

1. Is there a frustum available that I could use during a client tick to do this filtering?

2. If not, could I use the Frustum class to do what I want, or is it geared primarily for rendering?

3. Failing 1 & 2, is there a good example on the internet related to Minecraft to do what I am looking for?

 

Thanks!

[OreCruncher]

Follow up.  I instantiated a Frustum instance and it works pretty well.  In my case I am concerned about points rather than boxes so I pass in the coordinate twice to isBoxInFrustum().  It shaved quite a bit off the tick time for this routine.