(sketch_jul02f)
Left-click to make a point (try holding it down). If you exceed more than 5 points in a region, it will divide it.
Right-click to define the start point of the ray.
As you move around, it will highlight quads which are non-empty, undivided, and which the ray intersects.
It's sort of a precursor to collision detection. The goal is to narrow down the possible regions of collision as much as possible.
Oh, that naughty sketch! Please let us know what the issue is below.
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