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by Eric Lippert via Fabulous Adventures In Coding on 12/29/2011 3:05:00 PM
OK, let's finish up this year and this series. We have an algorithm that can compute what cells in the zero octant are in view to a viewer at the origin when given a function that determines whether a given cell is opaque or transparent. It marks the visible points by calling an action with the visible cells. We would like that to work in any octant, and for the viewer at any point, not just the origin. We can solve the "viewer at any point" problem by imposing a coordinate transformation on th
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