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Old 06 August 2012, 01:49   #5
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Join Date: Aug 2006
Location: Scunthorpe/United Kingdom
Posts: 1,047
Originally Posted by Galahad/FLT View Post
Are we talking the blitter tornado effect as seen in Stardust and the following Prestige cracktro?

[ Show youtube player ]
That's the one!

Originally Posted by pmc View Post
Never made one but I know roughly how it's done:

Push random pixels into the centre of the display (watch the effect and look closely at the centre of the screen, you'll see it)

Blitter copy the bitmap data around and out from the centre to the edges.

The random pixels coupled with the way the blitter copies are done gives the "fractal" looking spirals.
Indeed. I experimented with a simple zoom instead of the blitter copy, and it didn't look good. I'd love to know how the copy is actually performed.

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