don't understand how the code works in detail but I see atan(x/y) on some places. SOmetimes one need atan2(x,y) instead. See the link I send earlier. (2 posts ago)
don't understand how the code works in detail but I see atan(x/y) on some places. SOmetimes one need atan2(x,y) instead. See the link I send earlier. (2 posts ago)