At the moment, I am using around 2,000 light sources for my ship inside.
This is, to simulate a long stripe of light (5 km long) and with a white
inside and sunset colors to the side.

But I am considering to make the central cylinder along the middle axis
much thicker, and to put an .hdr image around it, emitting light. This
might MAYBE save me a lot of computing time.

Right now, I have to try to find out, how to create such an .hdr file.
The wise Internet will tell me...

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