the calculate process of the coordiate ?

OpenGL OpenGL: Basic Coding
1

I think , clip coordiate =ProjectionMatrixModelViewMatrixObjectCorrdiate ;
then NormalizedCorrdiate= ClipCorrdiate/Wclip

Window = NormalizedCorrdiate *Width (or Height)
but the outcome is error ?
Who can tell me ???

2

I don’t quite understand what your question is. You can read about the calculation process in the OpenGL specification. Perhaps that will help you undestand whatever problem you’re encountering.

3

where is the specification?
how can I find it ?

4

There’s a link to it from this site.
http://www.opengl.org/developers/documentation/specs.html