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Building Blocks
3D Vectors
If you're building a 3d program, you should consider building a 3d vector class first. The vector class can be used for both points and vectors. Includes sample code: vec3.h
Matrices
The matrix is another old staple of 3d programming. You'll find plenty of use for a 4x4 matrix class, such as the one presented in this article. Code: matrix.h
Quaternions
Quaternions are used to store and interpolate rotation. Here you can read about and view code for a decent sample quaternion class. Code: quat.h
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Engine Architecture #1