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clouds can spawn and drift in any direction

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This commit is contained in:
minjaesong
2023-08-23 12:49:33 +09:00
parent 845333f33d
commit 6e0004f165
3 changed files with 111 additions and 22 deletions
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37
src/net/torvald/terrarum/weather/WeatherObjectCloud.kt
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@@ -4,7 +4,9 @@ import com.badlogic.gdx.graphics.g2d.SpriteBatch
import com.badlogic.gdx.graphics.g2d.TextureRegion
import com.badlogic.gdx.math.Vector2
import com.badlogic.gdx.math.Vector3
import com.jme3.math.FastMath
import net.torvald.terrarum.App
import net.torvald.terrarum.App.printdbg
import kotlin.math.pow
import kotlin.math.sign
@@ -17,19 +19,30 @@ class WeatherObjectCloud(private val texture: TextureRegion, private val flipW:
throw UnsupportedOperationException()
}
var life = 0; private set
private fun getZflowMult(z: Float) = z / ((z / 4f).pow(1.5f))
/**
* FlowVector: In which direction the cloud flows. Vec3(dX, dY, dScale)
* Resulting vector: (x + dX, y + dY, scale * dScale)
*/
fun update(flowVector: Vector3, gait: Float) {
pos.add(flowVector.cpy().scl(vecMult).scl(gait))
pos.add(
flowVector.cpy().
scl(1f, 1f, getZflowMult(posZ)). // this will break the perspective if flowVector.z.abs() is close to 1, but it has to be here to "keep the distance"
scl(vecMult).scl(gait)
)
alpha = -(posZ / ALPHA_ROLLOFF_Z).pow(1f) + 1f
alpha = if (posZ < 1f) posZ.pow(0.5f) else -(posZ / ALPHA_ROLLOFF_Z) + 1f
val lrCoord = screenCoordBottomLR
if (lrCoord.x > WeatherMixer.oobMarginR || lrCoord.z < WeatherMixer.oobMarginL || posZ !in 0.05f..ALPHA_ROLLOFF_Z || alpha < 1f / 255f) {
val lrCoord = screenCoordBottomLRforDespawnCalculation
if (lrCoord.x > WeatherMixer.oobMarginR || lrCoord.z < WeatherMixer.oobMarginL || posZ !in 0.05f..ALPHA_ROLLOFF_Z + 1f || alpha < 0f) {
flagToDespawn = true
}
else {
life += 1
}
}
private val w = App.scr.halfwf
@@ -73,7 +86,21 @@ class WeatherObjectCloud(private val texture: TextureRegion, private val flipW:
val xL = posX - texture.regionWidth * scale * 0.5f
val xR = posX + texture.regionWidth * scale * 0.5f
val y = posY - texture.regionHeight * scale
val z = posZ // must be at least 1.0
val z = posZ // must be larger than 0
val drawXL = (xL + w * (z-1)) / z
val drawXR = (xR + w * (z-1)) / z
val drawY = (y + h * (z-1)) / z
return Vector3(drawXL, drawY, drawXR)
}
private val screenCoordBottomLRforDespawnCalculation: Vector3
get() {
val xL = posX - texture.regionWidth * scale * 0.5f
val xR = posX + texture.regionWidth * scale * 0.5f
val y = posY - texture.regionHeight * scale
val z = FastMath.interpolateLinear(posZ / ALPHA_ROLLOFF_Z, ALPHA_ROLLOFF_Z / 4f, ALPHA_ROLLOFF_Z)
val drawXL = (xL + w * (z-1)) / z
val drawXR = (xR + w * (z-1)) / z