solid pyramid
  facet normal 0 -1 0
    outer loop
      vertex 0 0 0
      vertex 1 0 0
      vertex 0.5 0 0.866
    endloop
  endfacet
  facet normal 0.816 0.333 0.471
    outer loop
      vertex 1 0 0
      vertex 0.5 1 0.433
      vertex 0.5 0 0.866
    endloop
  endfacet
  facet normal -0.816 0.333 0.471
    outer loop
      vertex 0 0 0
      vertex 0.5 0 0.866
      vertex 0.5 1 0.433
    endloop
  endfacet
  facet normal 0 0.333 -0.943
    outer loop
      vertex 0 0 0
      vertex 0.5 1 0.433
      vertex 1 0 0
    endloop
  endfacet
endsolid pyramid