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Schlegel diagram

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It can be constructed by a perspective projection viewed from a point outside of the polytope, above the center of a facet. All vertices and edges of the polytope are projected onto a hyperplane of that facet. If the polytope is convex a point near the facet will exist which maps the facet outside, and all other facets inside, so no edges need to cross in the projection.

The simplest way to guarantee this projection results in nonoverlapping edges on a general convex polytope is to first project all the vertices onto an n-sphere, and then perform a stereographic projection. The edges can appear curved in the final diagram if they are also mapped onto the n-sphere.

The easiest way of drawing a Schlegel Diagram is to 'project' the skeleton of the shape into one side.

See also Edit

  • Net (polyhedron) - A different approach for visualization by lowering the dimension of a polytope is to build a net, disconnecting facets, and unfolding until the facets can exist on a single hyperplane. This maintains the geometric scale and shape, but makes the topological connections harder to see.

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