DefinitionA <CANONICALLY PARAMETERISED TRIANGULAR SURFACE> is a <PARAMETERISED SURFACE> and a <TRIANGULAR SURFACE> and an <U BOUNDED SURFACE> and a <V BOUNDED SURFACE> ; it has a bi-linear parameterisation function with the triangle with vertices (0.0, 0.0), (1.0, 0.0), (0.0, 1.0) as its domain. as defined in ISO 15926 Part 3 Section 4.6.3.18