Re: 空が真っ暗になる画面表示異常について

/// が原因で起こる問題については、再現手順が分かったので、以下の内容を英語フォーラムに投稿しました。
https://forum.flightgear.org/viewtopic.php?f=69&t=30984&p=348361#p348361

(PC) FlightGear 2018.3.2, Windows 10 64bit, Intel HD Graphics 530

(再現手順)
-RJTT, ufo, noonでFlightGearを起動。他の設定は全てデフォルト(Real-world weatherは無効).
- View > Rendering OptionsからAtmospheric Light Scattering (ALS)をチェック
- Environment > WeatherからDetailed Weatherをチェック
- Weather ConditionsをCore high pressure regionからManual inputに変更
- METAR Dataを
XXXX 012345Z 15003KT 19SM FEW072 FEW350 25/07 Q1028 NOSIG
から
XXXX 012345Z 15003KT 19SM FEW/// FEW350 25/07 Q1028 NOSIG
に手入力で変更
- 空の色が水色から黒に変わることを確認。

(明らかに変化する内部プロパティ)
- Debug > Nasal Consoleから
props.dump(props.globals)
を実行し、fgfs.logから抽出
- 1行目: "FEW072" --- 問題無し
- 2行目: "FEW///" --- 問題が発生

/environment/metar/data {STRING} = XXXX 012345Z 15003KT 19SM FEW072 FEW350 25/07 Q1028 NOSIG
/environment/metar/data {STRING} = XXXX 012345Z 15003KT 19SM FEW/// FEW350 25/07 Q1028 NOSIG

/environment/metar/clouds/layer/elevation-ft {DOUBLE} = 7220
/environment/metar/clouds/layer/elevation-ft {DOUBLE} = -1e+20

/environment/ground-haze-thickness-m {DOUBLE} = 2877.312
/environment/ground-haze-thickness-m {DOUBLE} = -3.048e+19

(/instrumentation/wxradar not found)
/instrumentation/wxradar {NONE} = nil

/local-weather/cloud-shadows/cloudpos-x {NONE} = nil
/local-weather/cloud-shadows/cloudpos-x {DOUBLE} = 0

/local-weather/cloud-shadows/cloudpos-y {NONE} = nil
/local-weather/cloud-shadows/cloudpos-y {DOUBLE} = 0

/local-weather/cloud-shadows/cloudpos-x[1] {NONE} = nil
/local-weather/cloud-shadows/cloudpos-x[1] {DOUBLE} = 0

(snip...)

/local-weather/cloud-shadows/cloudpos-y[19] {NONE} = nil
/local-weather/cloud-shadows/cloudpos-y[19] {DOUBLE} = 0

(/local-weather/shadow-loop-flag not found)
/local-weather/shadow-loop-flag {DOUBLE} = 0