Fixed Nice Sitrec Example with 3d buildings and clouds

flarkey

flarkey

Senior Member.
Staff member
I investigated this sighting of a 'white light' over Solerno, Italy - turned out to be the ISS. But the Sitrec showed a great example of the new features of 3d buildings and clouds.... so I thought I'd share. Great work @Mick West !


Source: https://www.reddit.com/r/Astronomy/comments/1rsbbrv/luce_bianca_in_movimento_nel_cielo/


https://www.metabunk.org/sitrec/?custom=15857/SolrenoISS/
1773746358738.png
 
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That's great! Also, another good example of the ISS scintillating colors when it's lower in the sky- some people have insisted it's always a pure white light.

I wonder, though, if some of that is a phone camera artifact.

 
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flarkey said:
It worked quite well too, but the Look view sky is wrong - it thinks it is 11.30pm local, but its Norway in July so the sky is light. @Mick West Is there a setting to change the ambient "sky brightness"?
Click to expand...
Yeah, there's something wrong there. Seems like the whole day/night rendering is broken in that sitch. I'll look into it. Flagging this as a bug for now.
 
FIxed!
https://www.metabunk.org/sitrec/?custom=1/Lysekloster/20260318_211450.js
2026-03-18_14-15-29.jpg



Basically I just made it be more physically accurate.
The sky brightness model used a linear ramp from -8° to +5° sun elevation,
causing stars to appear at just -1.5° below the horizon (early civil twilight)
and reach full visibility by -8°. In reality, naked-eye stars don't emerge
until mid-nautical twilight (~-9°) and the sky isn't fully dark until
astronomical twilight ends at -18°.

Changes to calculateSkyBrightness():
- Extended range from [-8°, +5°] to [-18°, 0°] to cover the full
civil/nautical/astronomical twilight sequence
- Replaced linear interpolation with Hermite smoothstep (t²(3-2t)) which
keeps the sky brighter longer after sunset, matching observed behavior
- Stars now first appear around -9° to -10° instead of -1.5°
 
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