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1) search "sky" in manual, it turns up
Entity.flags2 can be SKY,CUBE,DOME etc. each explained in their own pages.
, it is possible to place a sky dome upside down? I tried changing the tilt but that doesn't work. And is it possible to place two sky domes (so you get a sphere)?

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2) search "sun" in manual, it turns up:
sun_light = 0; // no sun
, thanks, that works perfect

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3) set(my,LIGHT); to star model.
, thanks that worked