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Help!!! Graphics

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Hi can anyone help me out with this I have three vectors H L and U. These specify the heading of a turtle for drawing (logo style). Obviously I can apply rotations to the matrix [HLU] to vary the heading of the turtle. My question is this: Give a position in 3D space (x,y,z) and the heading matrix [HLU] how can I calculate the position (x'',y'',z'') which should be a distance of D in the direction the heading matrix away from (x,y,z)? This would help me massively! Cheers Dan

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