GraphicsComplex—Wolfram Language Documentation

Details and Options Details and Options

GraphicsComplex works in both 2D and 3D.
GraphicsComplex[{pt₁,pt₂,…},data] effectively replaces integers i that appear as coordinates in data by the corresponding pt_i.
GraphicsComplex provides a convenient way to build up meshes or simplicial complexes in which vertices of polygons are shared.
GraphicsComplex is treated like a single primitive in Graphics and Graphics3D.
In GraphicsComplex[pts,data], data can be any nested list of graphics primitives and directives.
The following options can be given:

ContentSelectable	Automatic	whether to allow contents to be selected
VertexColors	Automatic	vertex colors corresponding to each pt_i
VertexNormals	Automatic	vertex normals corresponding to each pt_i
VertexTextureCoordinates	None	vertex texture coordinates for each pt_i

GraphicsComplex[{pt₁,pt₂,…},data,VertexColors->{c₁,c₂,…}] replaces Polygon[{i,j,…}] by Polygon[{pt_i,pt_j,…},VertexColors->{c_i,c_j,…}].
The VertexNormals and VertexTextureCoordinates option works the same way.
Normal[GraphicsComplex[pts,data]] substitutes coordinates to give an ordinary list of graphics primitives and directives.