James A. Smith, Projection of a Vector upon a Plane from an Arbitrary Angle, via Geometric (Clifford) Algebra, 8 pages, vixra preprint: http://vixra.org/abs/1712.0524. Free PDF download: http://vixra.org/pdf/1712.0524v1.pdf
Abstract: We show how to calculate the projection of a vector, from an arbitrary direction, upon a given plane whose orientation is characterized by its normal vector, and by a bivector to which the plane is parallel. The resulting solutions are tested by means of an interactive GeoGebra construction.
Source: http://vixra.org/abs/1712.0524, accessed: 2 Feb. 2018