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VertexNormals—Wolfram Language Documentation

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• See Also
  • VertexColors
  • NormalsFunction
  • Polygon
• Related Guides
  • 3D Graphics Options
  • Colors
  • Polygons
  • Polyhedra

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 n_i for purposes of shading by simulated lighting.
• The n_i are vectors of the form {v_x,v_y,v_z}. 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.

A triangle with all normals pointing in the direction :

Using a different normal for one of the triangle's vertices changes the effects of lighting:

Specify vertex normals for 3D lines:

Specify vertex normals for 3D points:

Define vertices and face indices of a cylindrical model:

Without surface normals, the shading is constant or flat for each polygon face:

With surface normals, the shading is interpolated or smooth across each polygon face:

Plot functions automatically generate surface normals:

Without surface normals, you get flat or faceted shading:

A function that visualizes the surface normals using lines:

Visualize the normals for some surfaces:

Vary the effective normals used on the surface:

A shaded mesh line object with data from ExampleData:

Normals in opposite directions may cause unwanted banding effects in some 3D renderers:

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