From: Eric Peden <eric@...>
Date: 2005-03-01T01:02:43+09:00
Subject: Re: Rendering ruby openGL output to a file.

On Feb 28, 2005, at 5:26 AM, Brian Schr�der wrote:
> ow I want to include the images into
> my thesis, and I'd like to use a higher resolution that what my screen
> can give. Is it possible to render the image not onto the screen, but
> into a file, using a bigger-than-screen resolution? I'm quite an
> opengl newbie so maybe this is obious?

You might get some use out of RMagick, a Ruby interface for 
ImageMagick/GraphicsMagick:

   http://rmagick.rubyforge.org/

The OpenGL API works with raw color values packed into an array; 
RMagick (as far as I can tell) cannot. You should be able to draw your 
scene offscreen, then do a readPixels() and then convert the resulting 
array to RMagick Pixel values. Tell RMagick what your intended 
resolution is, and it will handle the rest.

-- 
eric