https://math.stackexchange.com/questions/180418/calculate-rotation-matrix-to-align-vector-a-to-vector-b-in-3d

http://forums.cgsociety.org/archive/index.php?t-741227.html

https://docs.unity3d.com/ScriptReference/Vector3.RotateTowards.html

https://stackoverflow.com/questions/22924225/python-maya-rotate-y-axis-to-be-along-vector#22936535

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https://blender.stackexchange.com/questions/69517/python-rotate-object-according-to-vectors

https://stackoverflow.com/questions/6802577/python-rotation-of-3d-vector

https://stackoverflow.com/questions/39497496/angle-between-two-vectors-3d-python

https://stackoverflow.com/questions/31735499/calculate-angle-clockwise-between-two-points

https://sites.google.com/site/mayariggingwiki/3d-math

https://www.mathsisfun.com/operation-order-pemdas.html

https://en.wikipedia.org/wiki/Linear_algebra

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https://forums.autodesk.com/t5/maya-programming/guide-how-to-install-numpy-scipy-in-maya-windows-64-bit/td-p/5796722

https://stackoverflow.com/questions/26820714/python-find-vector-direction-between-two-3d-points

https://math.stackexchange.com/questions/293116/rotating-one-3d-vector-to-another

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https://gamedev.stackexchange.com/questions/50963/how-to-extract-euler-angles-from-transformation-matrix

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https://en.wikipedia.org/wiki/Aircraft_principal_axes

https://d3cw3dd2w32x2b.cloudfront.net/wp-content/uploads/2012/07/euler-angles1.pdf

http://forums.cgsociety.org/archive/index.php?t-617014.html

c-sharp

http://www.c-sharpcorner.com/UploadFile/e9fdcd/basics-of-C-Sharp/