Re: [AD] Patch for the documentation of polygon_z_normal()

[Andrei Ellman <ae-a-alleg@xxxxxxxxxx>]

Robert Ohannessian wrote:
> > So what would be a good method for back-face culling without first
> > converting into screen space? The advantage this has is that it saves
>
> a
>
> > persp_project() call for any vertices who'se polys are completely
> > obscured.
>
>
> The trouble is that back-face culling requires you to know where your
> geometry is in screen-space. You can't just use clip space / eye space
> for this, or you'll either miss faces that could be back-face culled, or
> you'll cull too many faces.


So shall we just stick to the polygon_z_normal() method and agree that 
back-face culling in camera space is a concept that's too complicated 
for the basic Allegro package?


AE.