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Date: Wed, 5 Jul 1995 13:17:24 -0400
Subject: Re: HEAT waves
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On Wed, 5 Jul 1995, Brad Prosise wrote:

> He wants waves of heat moving in the
> foreground over the rest of the amination. Ive done some
> experiments with a subdivided plane in front of the camera.I am
> using the image map sequence from my fire (made for the fonts)
> as a displacement map and then making the plane transparent
> (refractive index 1.2). I turn trace refraction on and the
> resulting effect is ok but not convinceing. I was also treated
> to 14 minutes a frame rendering time. does anyone Know another
> way to do this?

Try rendering your animation without the heat waves first, so that you
have an image sequence on disk....then map this image sequence to a flat
plane that will fill the screen...use 100% luminosity and 0% diffusity to
avoid any color changes.  Put another flat plane directly in front of the
first(offset by a small amount)...make this plane totally transparent
with a decent amount of refraction and then use a moving Fractal Noise
texture as a bump map to give the rippling effect.  You'll need to play
around with the Fractal Noise settings to get the desired effect, but this
will definitely work and it will cut your render times way down without
screwing up the rest of the animation when you turn on Trace Refraction.

Hope this helps!

                                      -David Warner
                                       Event Horizon Graphics



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