Hello…

I have found a formula to rotate a vector about an arbitrary axis at

http://www.cise.ufl.edu/~cmccann/seniorp…or%20rotation’

… I wish to find the counterclockwise rotation around the arbitrary vector (u, 0, w); I’m setting v to 0 since my arbitrary vector involves rotations not including the y-axis.

Since I don’t have the matrix to invert it and only the final vector formula, I thought I could rotate the vector (u, 0, w) by 180 degrees around the y axis getting (-u, 0, -w). Plugging those values in didn’t hold…

Am I doing something wrong or is there another way to do it?

Thank you,

-TS…