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#2040 Cb clouds light up the wrong way

2018.3.0
Done
Weather (49)
Low
2024-01-23
2018-07-27
Mihajlo
No

Cb clouds appear bright when seen against the sun and away from the sun appear dark when it should be the opposite.
OS: Windows 10 April update
GPU: GTX 1050
Driver version: 398.36

2 Attachments

Discussion

  • xDraconian

    xDraconian - 2018-09-26
    • labels: --> Weather
     
  • Stuart Buchanan

    Stuart Buchanan - 2018-10-21
    • assigned_to: Stuart Buchanan
     
  • Mihajlo

    Mihajlo - 2018-10-21

    Just to clarify that this is Thorsten's inverse Mie scattering (Cb and small Cu clouds that are part of the thunderstorm scenario being dark away from the sun) . The issue here is that it shouldn't apply to Cb clouds. Only thin clouds like some species of Cirrus , or thin Altocumulus should behave this way.

     
  • Stuart Buchanan

    Stuart Buchanan - 2018-10-21

    Ah, OK. I'll assign it to Thorsten to take a look at then :)

    -Stuart

     
  • Stuart Buchanan

    Stuart Buchanan - 2018-10-21
    • assigned_to: Stuart Buchanan --> Thorsten Renk
     
  • Thorsten Renk

    Thorsten Renk - 2018-10-22

    I've been looking at a couple of Cb cloud towers, and by and large I can't reproduce this, sorry.

    There's always /some/ cloudlets which get incorrect lighting (nearly no matter what we do) but for some reason I see nothing as drastic as you do.

     
  • Thorsten Renk

    Thorsten Renk - 2018-10-22
    • status: New --> NeedInfo
     
  • Mihajlo

    Mihajlo - 2018-10-22

    Perhaps it needs a specific weather situation (a custom METAR string). I think the issue is more noticable when you select BW scenario called Stormy Monday than Thuderstorm scenario. In general it does seem to be a bit better now, possibly because of the new scattering on fringe.
    I noticed another thing related to cloud lighting, while testing Cb. In fair weather scenario small Cu clouds seem a lot darker than larger Cu clouds.

     

    Last edit: Mihajlo 2018-10-22
  • Gijs

    Gijs - 2024-01-23
    • status: NeedInfo --> Done
     
  • Gijs

    Gijs - 2024-01-23

    Appears to have been fixed in the mean time, so closing this for now. Please comment if you still experience the issue with a recent FlightGear.

     

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