檢視 Facet 的原始碼

=='''Format'''==
 facet normal
   outer loop
     vertex
     vertex
     vertex
   endloop
 endfacet

<font size=3>
Stereolithography CAD file format. The normal vector and vertex coordinate are recorded.

</font>

=='''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

The normal vector of the triangle is (1,0,0), while the vertices are (-1,-1,1), (-1,1,1), and (-1,1,0).