This command will return a float representing the V-Data value of the locked vertexdata. This typically is used to specify the vertical position of where the vertex grabs its texel from the associated texture, usually between 0.0 and 1.0. An optional Stage Number can be used to access UV data in secondary stages of the vertexdata.
Syntax:
return Float=GET VERTEXDATA U(Vertex Index)
return Float=GET VERTEXDATA U(Vertex Index, Stage Number)