VertexW# ( surface,index )

Quote:

VertexW# ( surface,index )
Parameters
surface - surface handle
index - index of vertex

Description
Returns the texture w coordinate of a vertex


OK, I know what U & V are but what is W?


P.S. Sorry for the cross post but I was gettin answers that I already know to be wrong in the beginners forum. (Sorry Beaker but this is a legit command that already produces valid data)

I think 'reserved for possible future use' is the correct answer.

As I recall, VertexW doesn't really return anything useful. It just gives a standard value of 1.

This is analogous to ReadPixel in 2D graphics. It tells you the alpha value is 255 ( fully opaque ) even though there really is no alpha support.

Beaker's answer was correct. And since Floyd agreed with him, so is his.

The W is for use in 3D textures. Its the Z co-ordinate of the texture used sometimes in procedural textures/shaders or certain file formats TIFF for example.