Triangular duoantifastegiaprism

The triangular duoantifastegiaprism or tridafup, also known as the triangular duoantiwedge or 3-3 duoantiwedge, is a convex scaliform polyteron and a member of the duoantifastegium family. It consists of 2 triangular duoprisms and 12 triangular antifastegiums. 1 triangular duoprism and 6 triangular antifastegiums join at each vertex.

This polyteron also occurs as a parabidiminishing of the dodecateron, formed by removing two opposite vertices, or removing two triangular duoprismatic pyramids.

Vertex coordinates
The vertices of a triangular duoantifastegiaprism of edge length 1 are given by:


 * $$±\left(0,\,\frac{\sqrt3}{3},\,0,\,\frac{\sqrt3}{3},\,\frac{\sqrt3}{6}\right),$$
 * $$±\left(0,\,\frac{\sqrt3}{3},\,±\frac12,\,-\frac{\sqrt3}{6},\,\frac{\sqrt3}{6}\right),$$
 * $$±\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,\frac{\sqrt3}{3},\,\frac{\sqrt3}{6}\right),$$
 * $$±\left(±\frac12,\,\frac{\sqrt3}{6},\,±\frac12,\,\frac{\sqrt3}{6},\,\frac{\sqrt3}{6}\right).$$