Graph Functions, Graph Equations -> Gallery -> Texture Mapping, Delaunay Triangles

Texture	Delaunay Triangles Based On Irregular Data (Grid)
Texture_blend	Delaunay Triangles Based On Irregular Data (Flat Surface)
Texture+Transparency	Delaunay Triangles Based On Irregular Data (Smooth Surface)

Note: If you have installed Visual Data in your machine, you can find these examples in Samples directory in your setup path.

Graph Functions, Graph Equations -> Gallery -> Texture Mapping, Delaunay Triangles