GLUTWIREOCTAHEDRON

Section: C Library Functions (3)
Updated: LOCAL
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BSD mandoc

NAME

glutWireOctahedron - Draw a wireframe octahedron.

LIBRARY

OpenGLUT - geometry

SYNOPSIS

In openglut.h Ft void Fn glutWireOctahedron void

DESCRIPTION

This function draws a regular wireframe 8-sided polyhedron centered at the origin. The vertices are at (+/-1, 0, 0), (0, +/-1, 0), (0, 0, +/-1).

CAVEATS

We visit the same vertices the same number of times as for the solid octahedron, but the order is different.

Draws every edge twice.

The lines have normals, but the normals are from the facets, rather than upon the edge. If you squint too hard, the lighting on a wireframe octahedron does not look quite right.

TODO

It may be faster (and look better) to draw each edge once, setting the Normal at each edge. (I don't think that this matters all that much, but a lineloop was proposed for the wire Cube for speed.)