rock

src/main/kotlin/Game.kt

@@ -18,6 +18,9 @@ import com.badlogic.gdx.math.*
 import com.badlogic.gdx.utils.Array
 import com.badlogic.gdx.utils.ScreenUtils
 import gay.pizza.CavesOfJolk.Resources.Companion.assetManager
+import ktx.math.times
+import org.lwjgl.system.MathUtil
+import kotlin.random.Random
 
 class Game: ApplicationAdapter()
 {
@@ -37,6 +40,7 @@ class Game: ApplicationAdapter()
 	private lateinit var cubeInstance: ModelInstance
 	private lateinit var floorInstance: ModelInstance
 	private lateinit var suzanneInstance: ModelInstance
+	private lateinit var rocks: kotlin.Array<ModelInstance>
 
 	private fun makeCube(texture: Texture): Model
 	{
@@ -122,7 +126,6 @@ class Game: ApplicationAdapter()
 
 		texJolk = assetManager.get("jolkmeup.jpg")
 		fntComic = assetManager.get("Comic Sans MS.ttf")
-		val suzanne = assetManager.get("suzanne.g3db", Model::class.java)
 
 		cube = makeCube(texJolk)
 		floor = makeFloor()
@@ -168,7 +171,30 @@ class Game: ApplicationAdapter()
 
 		cubeInstance = ModelInstance(cube)
 		floorInstance = ModelInstance(floor)
-		suzanneInstance = ModelInstance(suzanne)
+		suzanneInstance = ModelInstance(assetManager.get("suzanne.g3db", Model::class.java))
+		val rock = assetManager.get("rock.g3db", Model::class.java)
+		val rand = RandomXS128(69 + 420 + 1919 + 916 + 42 + 911)
+		val randQuaternion = { rand: RandomXS128 ->
+			var x: Float
+			var y: Float
+			var z: Float
+			do { x = rand.nextFloat(-1.0f, 1.0f); y = rand.nextFloat(-1.0f, 1.0f); z = x * x + y * y } while (z > 1.0f)
+			var u: Float
+			var v: Float
+			var w: Float
+			do { u = rand.nextFloat(-1.0f, 1.0f); v = rand.nextFloat(-1.0f, 1.0f); w = u * u + v * v } while (w > 1.0f)
+			val s = kotlin.math.sqrt((1.0f - z) / w)
+			Quaternion(x, y, s * u, s * v)
+		}
+		rocks = Array(50) { i->
+			ModelInstance(rock, Matrix4(
+				Vector3(
+					rand.nextFloat(16.0f),
+					rand.nextFloat(-0.75f, 0.125f),
+					-rand.nextFloat(16.0f)),
+				randQuaternion(rand),
+				Util.one * rand.nextFloat(0.6f, 1.2f)))
+		}
 		suzanneInstance.transform = Matrix4().translate(3.0f, 1.0f, -3.5f)
 	}
 
@@ -227,6 +253,7 @@ class Game: ApplicationAdapter()
 
 		modelBatch.begin(colin.camera)
 		modelBatch.render(floorInstance, env)
+		modelBatch.render(rocks.asIterable(), env)
 		modelBatch.render(cubeInstance, env)
 		modelBatch.render(suzanneInstance, env)
 		modelBatch.end()

src/main/kotlin/Resources.kt

@@ -49,6 +49,7 @@ class Resources private constructor()
 		assetManager.load("cobblestone.png", Texture::class.java, linearMipped)
 		assetManager.load("cobblestone_normal.png", Texture::class.java, linearMipped)
 		assetManager.load("cobblestone_specular.png", Texture::class.java, linearMipped)
+		assetManager.load("rock.g3db", Model::class.java)
 	}
 }
 

src/main/kotlin/Util.kt

@@ -11,6 +11,7 @@ import ktx.math.times
 import ktx.math.unaryMinus
 import org.hsluv.HUSLColorConverter
 import kotlin.math.pow
+import kotlin.random.Random
 
 fun Float.axisDeadzone(min: Float, max: Float): Float
 {
@@ -72,3 +73,5 @@ fun Color.mix(rhs: Color, x: Float) = Color(
 //FIXME: find some way to get rid of these warnings
 @Suppress("EXTENSION_SHADOWED_BY_MEMBER", "UNCHECKED_CAST")
 fun <T: Attribute> Attributes.get(type: Long) = get(type) as? T
+
+fun Random.nextFloat(min: Float, max: Float) = min + nextFloat() * (max - min)