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@@ -673,7 +673,7 @@ public IEnumerable<Point3D> GetCellsOnRay(Ray ray, int maxDepth)
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// "A Fast Voxel Traversal Algorithm for Ray Tracing"
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// John Amanatides, Andrew Woo
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// http://www.cse.yorku.ca/~amana/research/grid.pdf
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- // http://www.devmaster.net/articles/raytracing_series/A%20faster%20voxel%20traversal%20algorithm%20for%20ray%20tracing.pdf
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+ // https://web.archive.org/web/20100616193049/http://www.devmaster.net/articles/raytracing_series/A%20faster%20voxel%20traversal%20algorithm%20for%20ray%20tracing.pdf
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// NOTES:
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// * This code assumes that the ray's position and direction are in 'cell coordinates', which means
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