Facet
Format
facet normal
outer loop
vertex
vertex
vertex
endloop
endfacet
Stereolithography file format.
Example
facet normal -1.000000e+00 0.000000e+00 0.000000e+00
outer loop
vertex -1.000000e+00 -1.000000e+00 1.000000e+00
vertex -1.000000e+00 1.000000e+00 1.000000e+00
vertex -1.000000e+00 1.000000e+00 0.000000e+00
endloop
endfacet