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From: Tim Hunter <cyclists@nc.rr.com>
Newsgroups: comp.lang.ruby
Subject: Re: Rendering ruby openGL output to a file.
Date: Mon, 28 Feb 2005 11:29:53 -0500
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Eric Peden wrote:
> 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.
> 
The #constitute method takes an array of RGBA values as input:
http://www.simplesystems.org/RMagick/doc/image1.html#constitute