openfoam/tutorials/mesh/foamyQuadMesh/square/constant/triSurface/unit_cube.stl

solid inlet
  facet normal 1 0 0
    outer loop
       vertex 1 1 0.5
       vertex 1 0 0.5
       vertex 1 0 -0.5
    endloop
  endfacet
  facet normal 1 0 -0
    outer loop
       vertex 1 1 -0.5
       vertex 1 1 0.5
       vertex 1 0 -0.5
    endloop
  endfacet
endsolid inlet
solid cube.tri
  facet normal -1 0 0
    outer loop
       vertex 0 0 -0.5
       vertex 0 0 0.5
       vertex 0 1 0.5
    endloop
  endfacet
  facet normal -1 0 0
    outer loop
       vertex 0 1 -0.5
       vertex 0 0 -0.5
       vertex 0 1 0.5
    endloop
  endfacet
  facet normal 0 1 0
    outer loop
       vertex 1 1 0.5
       vertex 1 1 -0.5
       vertex 0 1 -0.5
    endloop
  endfacet
  facet normal -0 1 0
    outer loop
       vertex 0 1 0.5
       vertex 1 1 0.5
       vertex 0 1 -0.5
    endloop
  endfacet
  facet normal 0 -1 0
    outer loop
       vertex 0 0 -0.5
       vertex 1 0 -0.5
       vertex 1 0 0.5
    endloop
  endfacet
  facet normal 0 -1 0
    outer loop
       vertex 0 0 0.5
       vertex 0 0 -0.5
       vertex 1 0 0.5
    endloop
  endfacet
  facet normal 0 0 1
    outer loop
       vertex 1 1 0.5
       vertex 0 1 0.5
       vertex 0 0 0.5
    endloop
  endfacet
  facet normal 0 -0 1
    outer loop
       vertex 1 0 0.5
       vertex 1 1 0.5
       vertex 0 0 0.5
    endloop
  endfacet
  facet normal 0 0 -1
    outer loop
       vertex 0 0 -0.5
       vertex 0 1 -0.5
       vertex 1 1 -0.5
    endloop
  endfacet
  facet normal 0 0 -1
    outer loop
       vertex 1 0 -0.5
       vertex 0 0 -0.5
       vertex 1 1 -0.5
    endloop
  endfacet
endsolid cube.tri