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Planes in 3D Space
Visual and interactive introduction to 2D planes in 3D space.
By the way, an interesting property of only traveling along the plane normals is that it yields the point on the line of intersection that is closest to the origin. I recently analyzed the edit performance in Arkio and noticed that a method for solving three-plane intersections took around half of the total compute time when recalculating geometry. By implementing the more efficient method for three-plane intersections described in the book, we made the method~500% faster, increasing Arkio's edit performance by over 1.6x.
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