Vertex class

Vertex reference, used to access the raw vertex in TriMesh.

The Vertex type exposes the following members:

Method	Description
`compare_to(self, other)`	Compare the vertex with another vertex instance
`read_vector4(self, field)`	Read the vector4 field
`read_f_vector4(self, field)`	Read the vector4 field
`read_vector3(self, field)`	Read the vector3 field
`read_f_vector3(self, field)`	Read the vector3 field
`read_vector2(self, field)`	Read the vector2 field
`read_f_vector2(self, field)`	Read the vector2 field
`read_double(self, field)`	Read the double field
`read_float(self, field)`	Read the float field