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more solid maths model of the cloud colouring

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minjaesong
2023-09-28 18:41:34 +09:00
parent c39fd540ff
commit 9b32908cd6
1 changed files with 8 additions and 8 deletions
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16
src/net/torvald/terrarum/weather/WeatherMixer.kt
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@@ -21,7 +21,6 @@ import net.torvald.terrarum.gameworld.WorldTime.Companion.DAY_LENGTH
import net.torvald.terrarum.RNGConsumer
import net.torvald.terrarum.clut.Skybox
import net.torvald.terrarum.clut.Skybox.elevCnt
import net.torvald.terrarum.spriteassembler.ADPropertyObject
import net.torvald.terrarum.utils.JsonFetcher
import net.torvald.terrarum.utils.forEachSiblings
import net.torvald.terrarum.weather.WeatherObjectCloud.Companion.ALPHA_ROLLOFF_Z
@@ -563,17 +562,18 @@ internal object WeatherMixer : RNGConsumer {
batch.color = Color.WHITE
}
private val RECIPROCAL_OF_APPARENT_SOLAR_Y_AT_90DEG = 0.0000077
private val RECIPROCAL_OF_APPARENT_SOLAR_Y_AT_45DEG = 0.0000077
private val APPARENT_SOLAR_Y_AT_45DEG = 1.0 / RECIPROCAL_OF_APPARENT_SOLAR_Y_AT_45DEG
/**
* Mathematical model: https://www.desmos.com/calculator/8dsgigfoys
* Mathematical model: https://www.desmos.com/calculator/cf6wqwltqq
*/
private fun cloudYtoSolarAlt(cloudY: Double, currentsolarDeg: Double): Double {
fun g(x: Double) = atan(RECIPROCAL_OF_APPARENT_SOLAR_Y_AT_90DEG * x) / Math.PI
fun a(x: Double) = atan(0.0001 * x) / (0.5 * RECIPROCAL_OF_APPARENT_SOLAR_Y_AT_90DEG * Math.PI)
val delta = (180.0 - 2.0 * currentsolarDeg).abs() * g(cloudY - a(currentsolarDeg.abs()))
return (currentsolarDeg + CLOUD_SOLARDEG_OFFSET + delta).bipolarClamp(Skybox.elevMax)
fun a(x: Double) = APPARENT_SOLAR_Y_AT_45DEG * tan(Math.toRadians(x))
fun g(x: Double) = Math.toDegrees(atan(RECIPROCAL_OF_APPARENT_SOLAR_Y_AT_45DEG * x))
val phi = currentsolarDeg + CLOUD_SOLARDEG_OFFSET
val x = cloudY
return g(x + a(phi)).bipolarClamp(Skybox.elevMax)
}
/**