Geodesic
Projection from 4D to 3D
Journal for geometry and graphics, Tome 4 (2000) no. 1, pp. 055-07 Cet article a éte moissonné depuis la source Heldermann Verlag

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The aim of this paper is to give a survey on analytic representations of central and orthographic projections from R4 to R3 or R2. There are discussed various aspects of these projections, whereby some special relations were revealed, e.g., the fact that homogeneous coordinates or barycentric coordinates in R3 can be obtained by applying particular projections on a point with given cartesian coordinates in R4. We would also like to demonstrate that by projecting curves or 2-surfaces of R4 interesting shapes in R3 and R2 can be obtained. 
@article{JGG_2000_4_1_a3,
     author = {S. Zacharias and D. Velichova},
     title = {Projection from {4D} to {3D}},
     journal = {Journal for geometry and graphics},
     pages = {055--07},
     year = {2000},
     volume = {4},
     number = {1},
     url = {http://geodesic.mathdoc.fr/item/JGG_2000_4_1_a3/}
}
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S. Zacharias; D. Velichova. Projection from 4D to 3D. Journal for geometry and graphics, Tome 4 (2000) no. 1, pp. 055-07. http://geodesic.mathdoc.fr/item/JGG_2000_4_1_a3/