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Collision Detection
Line Box Intersection
Shows one possible to calculate line-box intersection. It can be used with mesh bounding boxes as a quicker initial test to speed up ray-mesh intersection tests.
Feet To Terrain
Read about how to calculate the exact height of a point on a terrain of triangles created from a heightmap. Then there's an overview of how this can be used to adjust skeletal animations to keep the feet at terrain height.
Bounding Boxes
Oriented bounding boxes are a common and useful bounding shape. Gives a data structure, and lists useful tests to perform on a bounding box. Includes complete sample source of an oriented bounding box class.
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Engine Architecture #1