openfoam/tutorials/mesh/cvMesh/simpleShapes/constant/triSurface/domain.stl

solid ascii
 facet normal -1 0 0
  outer loop
   vertex -0.7 -0.9 -1
   vertex -0.7 -0.9 1
   vertex -0.7 1.1 1
  endloop
 endfacet
 facet normal 1 0 -0
  outer loop
   vertex 1.3 -0.9 -1
   vertex 1.3 1.1 -1
   vertex 1.3 1.1 1
  endloop
 endfacet
 facet normal 0 -1 0
  outer loop
   vertex -0.7 -0.9 -1
   vertex 1.3 -0.9 -1
   vertex 1.3 -0.9 1
  endloop
 endfacet
 facet normal -0 1 0
  outer loop
   vertex -0.7 1.1 -1
   vertex -0.7 1.1 1
   vertex 1.3 1.1 1
  endloop
 endfacet
 facet normal 0 0 -1
  outer loop
   vertex -0.7 -0.9 -1
   vertex -0.7 1.1 -1
   vertex 1.3 1.1 -1
  endloop
 endfacet
 facet normal 0 -0 1
  outer loop
   vertex -0.7 -0.9 1
   vertex 1.3 -0.9 1
   vertex 1.3 1.1 1
  endloop
 endfacet
endsolid