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OpenGL Shader implementation of Corona effect?

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I would like to implement something like this: http://www.noisemachine.com/talk1/imgs/flame500.html using Cg shaders. But do I need read an image of sun-like object and then generate the effects or is there someway to use OpenGL to create the initial image before implmenting the Perlin-Noise function in Cg?

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Where do I find that? On this page:

http://developer.nvidia.com/object/fxc_sample_projects.html

there are no samples with the corona effect.

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