randomised weather but i'm just faking it rn

src/net/torvald/terrarum/weather/BaseModularWeather.kt

@@ -1,9 +1,12 @@
 package net.torvald.terrarum.weather
 
 import com.badlogic.gdx.math.Vector2
+import com.badlogic.gdx.math.Vector3
 import com.badlogic.gdx.utils.JsonValue
+import com.jme3.math.FastMath
 import net.torvald.terrarum.GdxColorMap
 import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
+import kotlin.math.absoluteValue
 
 /**
  * Note: Colour maps are likely to have sparse data points
@@ -13,27 +16,45 @@ import net.torvald.terrarumsansbitmap.gdx.TextureRegionPack
  * Created by minjaesong on 2016-07-11.
  */
 data class BaseModularWeather(
-        val json: JsonValue,
-        var skyboxGradColourMap: GdxColorMap, // row 0: skybox grad top, row 1: skybox grad bottom, row 2: sunlight (RGBA)
-        val daylightClut: GdxColorMap,
-        val classification: String,
-        val cloudChance: Float,
-        val windSpeed: Float,
-        val cloudGamma: Vector2,
-        val cloudGammaVariance: Vector2,
-        var clouds: List<CloudProps>, // sorted by CloudProps.probability
+    val json: JsonValue,
+    var skyboxGradColourMap: GdxColorMap, // row 0: skybox grad top, row 1: skybox grad bottom, row 2: sunlight (RGBA)
+    val daylightClut: GdxColorMap,
+    val classification: String,
+    val cloudChance: Float,
+    val windSpeed: Float,
+    val windSpeedVariance: Float,
+    val cloudGamma: Vector2,
+    val cloudGammaVariance: Vector2,
+    var clouds: List<CloudProps>, // sorted by CloudProps.probability
 
-        val mixFrom: String? = null,
-        val mixPercentage: Double? = null
-)
+    val mixFrom: String? = null,
+    val mixPercentage: Double? = null,
+
+    var forceWindVec: Vector3? = null
+) {
+    /**
+     * @param rnd random number between -1 and +1
+     */
+    fun getRandomWindSpeed(rnd: Float): Float {
+        val v = 1f + rnd.absoluteValue * windSpeedVariance
+        return if (rnd < 0) windSpeed / v else windSpeed * v
+    }
+}
 
 data class CloudProps(
-        val category: String,
-        val spriteSheet: TextureRegionPack,
-        val probability: Float,
-        val baseScale: Float,
-        val scaleVariance: Float,
-        val altLow: Float,
-        val altHigh: Float,
+    val category: String,
+    val spriteSheet: TextureRegionPack,
+    val probability: Float,
+    val baseScale: Float,
+    val scaleVariance: Float,
+    val altLow: Float,
+    val altHigh: Float,
 ) {
+    /**
+     * @param rnd random number between -1 and +1
+     */
+    fun getCloudScaleVariance(rnd: Float): Float {
+        val v = 1f + rnd.absoluteValue * scaleVariance
+        return if (rnd < 0) baseScale / v else baseScale * v
+    }
 }