Am 12.09.2016 um 09:13 schrieb And:
> I would like to develop it to commercial in the future.

Don't steal code from POV-Ray then. ;)

For a commercial sky rendering tool, OpenEXR output is probably
mandatory. The format is comparatively complex though, so you'll
probably want to use a library for that. Unfortunately (for you, not for
POV-Ray ;)) the official library is written in C++, so you'd have to go
for JNI to use that one. A few people seem to have set out to write
OpenEXR libraries for Java, but at present none of those seem to stand
out as the definitive choice, and their legal status may be too poorly
defined for your purposes. (The official OpenEXR library is perfectly
fine in that respect.)

Writing a minimalistic OpenEXR exporter yourself /may/ be possible,
provided you ignore all the fancy bells and whistles that have been
incorporated into the format since its inception.

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