The item cannons calculation for the cursor is somewhat wrong, it can focus on the pointed block but only in the x and z axis it seems.
If I point at a block at `x20 y80 z50` and `x20 y120 z50` there…
This issue has been discussed over email and I will try to summarize the ideas my Ellen, Mark and me below. All the work so far was done with [physics.js](http://github.com/wellcaffeinated/PhysicsJS).…