Android OpenGL 3x3 Matrix to Quaternion
I want to rotate a 3D cube using a 3x3 matrix. I manage to get the matrix but OpenGL needs a quaternion to rotate the cube using
glRotatef (float angle, float x, float y, float z);
How can I go from a 3x3 matrix to a quaternion to use this method properly ?
Thanks!
glRotatef doesn't expect a quaternion, but an axis and angle (in degrees). Have a look at:
http://www.euclideanspace.com/maths/geometry/rotations/conversions/matrixToAngle/index.htm
See Here to see how it is done in javascript. The method is the same, it converts a 3x3 matrix into a quaternion, just convert the code to java and away you go.
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