# whynotme

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Lepton
1. ## Global and local 3D rotation

Thanks, but I still don't fully understand I am not good at maths, especially at 3D transform. I am working with Flash, it is a 3D environment but has only 3 rotation tools: around fixed x, y, and z axes. Now I have a cube at a random position and inclined at random angle. And I want to rotate the cube around its edge, but I only have rotation around global x, y, z axes, how can I rotate the cube around its edge - a random axis? And there is another problem, I don't know why and how to solve: When I apply the rotation, ie rotationX(30) then rotationY(50), rotationZ(70) - the angle is
2. ## Global and local 3D rotation

Hi, I want to covert between global and local coordinates when rotating 3D object because some program only allow to rotate by global or local coordinate. Example in this image, if I rotate Y by global coordinate (black coordinate) then the red object will rotate around black y axis. But I want to rotate it around y' axis, the local axis of the object. How can I rotate object around local axis using global rotation? And how can I rotate around global axis using local axis? Thanks
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