solid ascii
 facet normal -1 0 0
  outer loop
   vertex 0.3 0 0
   vertex 0.3 0 0.1
   vertex 0.3 0.2 0
  endloop
 endfacet
 facet normal -1 0 0
  outer loop
   vertex 0.3 0.2 0.1
   vertex 0.3 0.2 0
   vertex 0.3 0 0.1
  endloop
 endfacet
endsolid
