Very Computer

Has anyone out there had any luck at printing using OpenGl and
MFC? If so would you kindly assist me in attempting the same.
This is an urgent requirement, so I would be very grateful for
any assistence offered.

--
Martin J. Bysh

Quote:>Has anyone out there had any luck at printing using OpenGl and
>MFC? If so would you kindly assist me in attempting the same.

First of all, I've never succeded in using the metafile technique described
in Microsoft's documentation...
I do the rendering into a DIB section attached to a memory device context
(with the PFD_DRAW_TO_BITMAP flag for SetPixelFormat()). I use a 24-bpp DIB
for it gives the best results.
The problem is that the resolution of a printer is far superior to that of a
screen. With 600 dpi, you would need hundreds of millions of pixels, which
is just too much for OpenGL (i.e. wglCreateContext() will fail).
So I cut the rendering into stripes with a height such that width *
stripe_height < 1 million (for example).
For each stripe, set the partial viewport with glViewport() and the partial
window with glOrtho() / glFrustum(), and render the scene (with a good view
culling, it's not too costly). Then blt the DIB at the good place into the
printer device context using StretchBlt(). The printer driver will handle
the dithering...

I've tested this method on a black&white HP laser printer and on a color
inkjet printer, and it works fine. Good luck!

Olivier.