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Restoring some organizational sanity since adopting autotools.
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vestigial deficiency from variable gravity experiment
also reduced gravity, the results seem more aesthetically pleasing.
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More of 86bc322, eliminate per-particle unnecessary calls
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trivial per-particle savings
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Multiplies tend to be less costly
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A while ago I made this particle system on SDL, and had the beginnings of
an octree implemented within it, but never finished actually using the
octree to accelerate the proximity searches.
This now has the octree completed and of course more particle interactions now
that neighbors could be found more quickly.
The simulation somewhat resembles a fireworks display. Every particle is drawn
as a single pixel. The visual effect is dominated by spontaneously spawned
rockets which explode into thousands of particles accompanied by bursts that
thrust particles away from the explosion radially in an expanding sphere
resembling a shock wave. When the shock wave happens to strike another rocket,
it explodes, resulting in another shock wave. This can produce spectacular
chain reactions, so it's worth running for some time and seeing what transpires.
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