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stars: more realistic twinkle, change of axial tilt changes starmap 'altitude'

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minjaesong
2023-08-03 23:55:19 +09:00
parent c73461a407
commit 385a882937
3 changed files with 25 additions and 9 deletions
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9
src/net/torvald/terrarum/gameworld/WorldTime.kt
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@@ -135,11 +135,18 @@ class WorldTime(initTime: Long = 0L) {
val x = (TIME_T % YEAR_SECONDS).toDouble() / DAY_LENGTH + 15 // decimal days. One full day = 1.0
// 51.56 and 23.44 will make yearly min/max elevation to be 75deg
val d = -23.44 * cos(TWO_PI * x / YEAR_DAYS)
return -51.56 * cos(TWO_PI * x) + d
val p = -51.56 * cos(TWO_PI * x)
return d + p
}
val solarElevationRad: Double
get() = Math.toRadians(solarElevationDeg)
val axialTiltDeg: Double
get() {
val x = (TIME_T % YEAR_SECONDS).toDouble() / DAY_LENGTH + 15 // decimal days. One full day = 1.0
return -23.44 * cos(TWO_PI * x / YEAR_DAYS)
}
@Transient private var realSecAcc: Double = 0.0
@Transient private val REAL_SEC_TO_GAME_SECS = 1.0 / GAME_MIN_TO_REAL_SEC // how slow is real-life clock (second-wise) relative to the ingame one