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clouds will despawn of old age

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This commit is contained in:
minjaesong
2023-08-23 21:22:46 +09:00
parent bf87dc04cb
commit 26a4cdbce1
2 changed files with 49 additions and 5 deletions
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20
src/net/torvald/terrarum/weather/WeatherObjectCloud.kt
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@@ -8,6 +8,7 @@ import com.jme3.math.FastMath
import net.torvald.terrarum.App
import net.torvald.terrarum.App.printdbg
import kotlin.math.pow
import kotlin.math.roundToInt
import kotlin.math.sign
/**
@@ -20,9 +21,14 @@ class WeatherObjectCloud(private val texture: TextureRegion, private val flipW:
}
var life = 0; private set
var despawnCode = ""; private set
private val lifespan = 40000 + ((Math.random() + Math.random()) * 20000).roundToInt() // triangular distibution of 40000..80000
private fun getZflowMult(z: Float) = z / ((z / 4f).pow(1.5f))
private var eigenAlpha = 0f
/**
* FlowVector: In which direction the cloud flows. Vec3(dX, dY, dScale)
* Resulting vector: (x + dX, y + dY, scale * dScale)
@@ -34,11 +40,22 @@ class WeatherObjectCloud(private val texture: TextureRegion, private val flipW:
scl(vecMult)
)
alpha = if (posZ < 1f) posZ.pow(0.5f) else -((posZ - 1f) / ALPHA_ROLLOFF_Z) + 1f
eigenAlpha = if (posZ < 1f) posZ.pow(0.5f) else -((posZ - 1f) / ALPHA_ROLLOFF_Z) + 1f
alpha = eigenAlpha * if (life < lifespan) 1f else 1f - (life - lifespan) / OLD_AGE_DECAY
val lrCoord = screenCoordBottomLRforDespawnCalculation
if (lrCoord.x > WeatherMixer.oobMarginR || lrCoord.z < WeatherMixer.oobMarginL || posZ !in 0.0001f..ALPHA_ROLLOFF_Z + 1f || alpha < 0f) {
flagToDespawn = true
despawnCode = if (lrCoord.x > WeatherMixer.oobMarginR) "OUT_OF_SCREEN_RIGHT"
else if (lrCoord.z < WeatherMixer.oobMarginL) "OUT_OF_SCREEN_LEFT"
else if (posZ < 0.0001f) "OUT_OF_SCREEN_TOO_CLOSE"
else if (posZ > ALPHA_ROLLOFF_Z + 1f) "OUT_OF_SCREEN_TOO_FAR"
else if (life >= lifespan + OLD_AGE_DECAY) "OLD_AGE"
else if (alpha < 0f) "ALPHA_BELOW_ZERO"
else "UNKNOWN"
}
else {
life += 1
@@ -115,5 +132,6 @@ class WeatherObjectCloud(private val texture: TextureRegion, private val flipW:
companion object {
fun screenXtoWorldX(screenX: Float, z: Float) = screenX * z - App.scr.halfwf * (z - 1f)
const val ALPHA_ROLLOFF_Z = 64f
const val OLD_AGE_DECAY = 4000f
}
}