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import info.laht.threekt.THREE
import info.laht.threekt.cameras.PerspectiveCamera
import info.laht.threekt.external.controls.OrbitControls
import info.laht.threekt.external.libs.datgui.GUIParams
import info.laht.threekt.external.libs.datgui.NumberController
import info.laht.threekt.external.libs.datgui.dat
import info.laht.threekt.geometries.BoxGeometry
import info.laht.threekt.geometries.PlaneGeometry
import info.laht.threekt.lights.AmbientLight
import info.laht.threekt.lights.PointLight
import info.laht.threekt.materials.MeshBasicMaterial
import info.laht.threekt.materials.MeshPhongMaterial
import info.laht.threekt.math.ColorConstants
import info.laht.threekt.objects.Mesh
import info.laht.threekt.renderers.WebGLRenderer
import info.laht.threekt.renderers.WebGLRendererParams
import info.laht.threekt.scenes.Scene
import kotlin.browser.document
import kotlin.browser.window
import kotlin.math.pow
class Terrain {
private val renderer: WebGLRenderer
private val scene: Scene = Scene()
private val camera: PerspectiveCamera
private val controls: OrbitControls
private lateinit var simplexNoise: SimplexNoise
private lateinit var terrainMesh: Mesh
private lateinit var waterMesh: Mesh
private val size: Int = 256
enum class ScalingType {
LINEAR, EXPONENTIAL
}
var zoomFactor = 80
var scalingFactor = 11
var scalingType = ScalingType.LINEAR
var autoRotate = false
var waterHeight = 5
var snowHeightThreshold = 15
var showWireframe = false
init {
scene.add(AmbientLight(0xeeeeee))
PointLight(0xffffff)
.apply {
castShadow = true
position.set(0, 90, 200)
}.also(scene::add)
camera = PerspectiveCamera(75, window.innerWidth.toDouble() / window.innerHeight, 0.1, 1000)
camera.position.setZ(45)
camera.position.setY(-73)
renderer = WebGLRenderer(WebGLRendererParams(antialias = true))
.apply {
setClearColor(ColorConstants.black, 1)
setSize(window.innerWidth, window.innerHeight)
}
controls = OrbitControls(camera, renderer.domElement)
initGui()
seedNoise()
generateTerrain()
generateWater()
window.addEventListener("resize", {
camera.aspect = window.innerWidth.toDouble() / window.innerHeight
camera.updateProjectionMatrix()
renderer.setSize(window.innerWidth, window.innerHeight)
}, false)
document.getElementById("container")
?.apply {
appendChild(renderer.domElement)
}
}
private fun seedNoise() {
simplexNoise = js("new SimplexNoise()") as SimplexNoise
}
fun reseedNoise() {
seedNoise()
generateTerrain()
}
private fun generateTerrain() {
if (this::terrainMesh.isInitialized) {
scene.remove(terrainMesh)
}
val terrainGeom = PlaneGeometry(100,100, size-1, size-1)
for (x in 0 until size) {
for (y in 0 until size) {
if (x == 0 || x == size-1 || y == 0 || y == size-1) {
terrainGeom.vertices[x + (y*size)].setZ(0)
} else {
var noise = simplexNoise.noise2D(x / zoomFactor.toDouble(), y / zoomFactor.toDouble())
noise += (0.01 * simplexNoise.noise2D(x.toDouble(), y.toDouble()))
noise += 1
// have to toString here for JS interop
if (scalingType.toString() == ScalingType.LINEAR.toString()) {
noise *= scalingFactor
} else {
noise = noise.pow(scalingFactor)
}
terrainGeom.vertices[x + (y * size)].setZ(noise)
}
}
}
applyHeightMapColour(terrainGeom)
terrainGeom.computeFaceNormals()
terrainGeom.computeVertexNormals()
terrainGeom.colorsNeedUpdate = true
val terrainMaterial = MeshPhongMaterial()
.apply {
if (showWireframe) {
wireframe = true
wireframeLinewidth = 1.0
}
vertexColors = THREE.FaceColors
}
terrainMesh = Mesh(terrainGeom, terrainMaterial)
.apply { receiveShadows = true }
.also(scene::add)
}
private fun applyHeightMapColour(planeGeometry: PlaneGeometry) {
planeGeometry.faces.forEach { face ->
val vertexes = listOf(planeGeometry.vertices[face.a].z, planeGeometry.vertices[face.b].z, planeGeometry.vertices[face.c].z)
val min = vertexes.min()!!
if (min < snowHeightThreshold) {
face.color?.set(ColorConstants.forestgreen)
} else if (min >= snowHeightThreshold) {
face.color?.set(ColorConstants.floralwhite)
}
}
}
private fun generateWater() {
if (this::waterMesh.isInitialized) {
scene.remove(waterMesh)
}
val waterGeom = BoxGeometry(99, 99, waterHeight)
val waterMaterial = MeshBasicMaterial()
.apply {
color.set(ColorConstants.aqua)
transparent = true
opacity = 0.7
}
waterMesh = Mesh(waterGeom, waterMaterial)
.also {
scene.add(it)
it.translateZ(waterHeight/2)
}
}
@Suppress("UNCHECKED_CAST_TO_EXTERNAL_INTERFACE")
fun initGui() {
dat.GUI(
GUIParams(
closed = false
)
).also {
(it.add(this, "zoomFactor") as NumberController).apply {
min(10)
.max(200)
.step(5)
.onChange { generateTerrain() }
}
(it.add(this, "scalingFactor") as NumberController).apply {
min(0)
.max(50)
.step(1)
.onChange { generateTerrain() }
}
(it.add(this, "waterHeight") as NumberController).apply {
min(0)
.max(30)
.step(1)
.onChange { generateWater() }
}
(it.add(this, "snowHeightThreshold") as NumberController).apply {
min(0)
.max(30)
.step(1)
.onChange { generateTerrain() }
}
it.add(this, "scalingType", ScalingType.values()).onChange {
generateTerrain()
}
it.add(this, "reseedNoise")
it.add(this, "showWireframe").onChange { generateTerrain() }
it.add(this, "autoRotate")
}
}
fun animate() {
window.requestAnimationFrame {
if (autoRotate) {
terrainMesh.rotation.z += 0.005
waterMesh.rotation.z += 0.005
// println("x:${camera.position.x} y: ${camera.position.y} z:${camera.position.z}")
}
animate()
}
renderer.render(scene, camera)
}
}
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