I posted a POV-Ray SDL version sky-render program a few months ago.
http://news.povray.org/povray.binaries.images/thread/%3Cweb.5707b68461e083edaf5560460%40news.povray.org%3E/?ttop=410795
&toff=50

But it renders very slow(when turns on secondary scattering). So I write it with
Java currently. It performs 50X faster.

This is a demo image:
I calculated the light until fourth scattering. It takes about 5 hours to
render, image resolution 960x480.
For sunset, sun light propagates a long distance in the atmosphere. So the high
level scattering takes an important role.

This time, I get a bottleneck that I don't know how can I output image to an
HDRI image format like .exr or .hdr. I just output a .png that Java build in. I
need some help.

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