BUILT-IN MATHEMATICA SYMBOL
VertexNormals
VertexNormals
is an option for graphics primitives which specifies the normal directions to assign to 3D vertices.
- VertexNormals can be used with Polygon, Line, Point, and GraphicsComplex.
- VertexNormals->{n1, n2, ...} specifies that vertex i should have effective normal
for purposes of shading by simulated lighting.
- The
are vectors of the form 
. Only the directions of these vectors ever matter; the vectors are in effect automatically normalized to unit length.
- VertexNormals->None specifies that no explicit vertex normals are being given, and normal directions should be deduced from the actual coordinates specified for vertices. For point and line-like primitives, no shading based on simulated lighting should be done.
- VertexNormals->Automatic is equivalent to VertexNormals->None, except that vertex normals given in any enclosing GraphicsComplex will be used.
Compute normal vectors using the cross product of edge vectors:
| Out[2]= |  |
A triangle with normals pointing in the direction 
:
| Out[3]= |  |
Using different normals will affect shading:
| Out[4]= |  |
Specify vertex normals for 3D lines:
| Out[5]= |  |
Specify vertex normals for 3D points:
| Out[6]= |  |
New in 6
