I read an article by Chris Hargrove and I came across the following formula for rotatio around the x axis. NewY = (OldY*Cos(ThetaX)) - (OldZ*Sin(ThetaX)) ** X axis NewZ = (OldZ*Cos(ThetaX)) + (OldY*Sin(ThetaX)) (Copy NewY and NewZ into OldY and OldZ) He said it could be optimized by only doing a total of 9 multiplies. How can I do this?