[PyOpenGL-Users] Re: passing Numeric arrays to PyOpenGL

[Mike C. F. <mcf...@ro...>]

(Again, switched to PyOpenGL users to avoid spamming general python people)

I'm assuming you've already discovered the problem in your geometry (you 
are using backward-facing polygons).  I've attached a working 
OpenGLContext module which shows both the list and array versions 
working properly (hit 'a' to switch between the two versions).

The switch makes no difference on my machine, by the way.  Both versions 
are drawn as nothing unless the face culling is disabled.  This is 
running with the latest version of PyOpenGL 2.0.1, by the way.  There 
are, obviously, two different paths through the wrapper for the list 
versus the array versions, but AFAIK, both versions should work, even 
with the 2.0.0 PyOpenGL release (I don't think I fixed any errors in 
this area for the 2.0.1 release).

Enjoy yourself,
Mike

TheDustbustr wrote:

>Here's the code.
>
>VertexArray=[[0,0,0],[1,0,0],[2,0,0],
>             [0,1,0],[1,1,0],[2,1,0],
>             [0,2,0],[1,2,0],[2,2,0]]
>IndiceArray=[0,3,4,0,4,1,1,4,5,1,5,2,3,6,7,3,7,4,4,7,8,4,8,5]
>
>#VertexArray=array(VertexArray, 'f')    #Here's the problem line
>IndiceArray=array(IndiceArray, 'i')
>
>glVertexPointerf(VertexArray)
>glDrawElementsui(GL_TRIANGLES, IndiceArray)
>
>With the noted line commented, a Python list is passed to glVertexPointer, and
>everything is dandy.  When the noted line is uncommented, nothing is drawn.  No
>Numeric errors.
>
>Whats the deal here?  Why isn't IndiceArray affected by being converted to an
>array, and why IS VertexArray affected?
>
>Thanks, Dustin
>  
>
_______________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://members.rogers.com/mcfletch/