keywords: [Math]The Mathematics of the 3D Rotation Matrix

The Mathematics of the 3D Rotation Matrix
https://www.fastgraph.com/makegames/3drotation/

How to combine rotation in 2 axis into one matrix
http://computergraphics.stackexchange.com/questions/1608/how-to-combine-rotation-in-2-axis-into-one-matrix

Rotation matrix
https://en.wikipedia.org/wiki/Rotation_matrix

云山苍苍，江水泱泱，先生之风，山高水长。---范仲淹《严先生祠堂记》