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I am currently working on a Minecraft clone (a voxel game). The feature I'm working on is the ability to break blocks. I have a ray-casting/ray tracing algorithm for traversing the voxels, but the only thing I don't know how to do is find the direction vector of the ray.

How can I find a unit vector representing the direction of a ray in 3D space given the pitch and yaw degrees of the ray (and the ray origin, of course)?

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