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@@ -0,0 +1,499 @@
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+import * as THREE from 'https://cdn.jsdelivr.net/npm/[email protected]/build/three.module.js';
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+import {GUI} from 'https://cdn.jsdelivr.net/npm/[email protected]/examples/jsm/libs/dat.gui.module.js';
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+import {Sky} from 'https://cdn.jsdelivr.net/npm/[email protected]/examples/jsm/objects/Sky.js';
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+import {game} from './game.js';
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+import {graphics} from './graphics.js';
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+import {math} from './math.js';
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+import {noise} from './noise.js';
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+import {spline} from './spline.js';
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+
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+import {OrbitControls} from 'https://cdn.jsdelivr.net/npm/[email protected]/examples/jsm/controls/OrbitControls.js';
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+
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+
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+let _APP = null;
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+
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+
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+class HeightGenerator {
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+ constructor(generator, position, minRadius, maxRadius) {
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+ this._position = position.clone();
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+ this._radius = [minRadius, maxRadius];
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+ this._generator = generator;
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+ }
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+
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+ Get(x, y) {
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+ const distance = this._position.distanceTo(new THREE.Vector2(x, y));
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+ let normalization = 1.0 - math.sat(
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+ (distance - this._radius[0]) / (this._radius[1] - this._radius[0]));
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+ normalization = normalization * normalization * (3 - 2 * normalization);
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+
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+ return [this._generator.Get(x, y), normalization];
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+ }
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+}
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+
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+class FlaredCornerHeightGenerator {
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+ constructor() {
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+ }
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+
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+ Get(x, y) {
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+ if (x == -250 && y == 250) {
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+ return [128, 1];
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+ }
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+ return [0, 1];
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+ }
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+}
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+
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+
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+class BumpHeightGenerator {
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+ constructor() {
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+ }
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+
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+ Get(x, y) {
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+ const dist = new THREE.Vector2(x, y).distanceTo(new THREE.Vector2(0, 0));
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+
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+ let h = 1.0 - math.sat(dist / 250.0);
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+ h = h * h * h * (h * (h * 6 - 15) + 10);
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+
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+ return [h * 128, 1];
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+ }
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+}
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+
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+
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+class Heightmap {
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+ constructor(params, img) {
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+ this._params = params;
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+ this._data = graphics.GetImageData(img);
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+ }
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+
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+ Get(x, y) {
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+ const _GetPixelAsFloat = (x, y) => {
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+ const position = (x + this._data.width * y) * 4;
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+ const data = this._data.data;
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+ return data[position] / 255.0;
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+ }
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+
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+ // Bilinear filter
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+ const offset = new THREE.Vector2(-250, -250);
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+ const dimensions = new THREE.Vector2(500, 500);
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+
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+ const xf = 1.0 - math.sat((x - offset.x) / dimensions.x);
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+ const yf = math.sat((y - offset.y) / dimensions.y);
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+ const w = this._data.width - 1;
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+ const h = this._data.height - 1;
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+
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+ const x1 = Math.floor(xf * w);
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+ const y1 = Math.floor(yf * h);
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+ const x2 = math.clamp(x1 + 1, 0, w);
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+ const y2 = math.clamp(y1 + 1, 0, h);
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+
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+ const xp = xf * w - x1;
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+ const yp = yf * h - y1;
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+
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+ const p11 = _GetPixelAsFloat(x1, y1);
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+ const p21 = _GetPixelAsFloat(x2, y1);
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+ const p12 = _GetPixelAsFloat(x1, y2);
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+ const p22 = _GetPixelAsFloat(x2, y2);
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+
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+ const px1 = math.lerp(xp, p11, p21);
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+ const px2 = math.lerp(xp, p12, p22);
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+
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+ return math.lerp(yp, px1, px2) * this._params.height;
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+ }
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+}
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+
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+const _WHITE = new THREE.Color(0x808080);
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+const _OCEAN = new THREE.Color(0xd9d592);
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+const _BEACH = new THREE.Color(0xd9d592);
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+const _SNOW = new THREE.Color(0xFFFFFF);
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+const _FOREST_TROPICAL = new THREE.Color(0x4f9f0f);
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+const _FOREST_TEMPERATE = new THREE.Color(0x2b960e);
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+const _FOREST_BOREAL = new THREE.Color(0x29c100);
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+
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+class TerrainChunk {
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+ constructor(params) {
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+ this._params = params;
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+ this._Init(params);
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+ }
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+
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+ _Init(params) {
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+ const size = new THREE.Vector3(
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+ params.width * params.scale, 0, params.width * params.scale);
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+
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+ this._plane = new THREE.Mesh(
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+ new THREE.PlaneGeometry(size.x, size.z, 128, 128),
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+ new THREE.MeshStandardMaterial({
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+ wireframe: false,
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+ color: 0xFFFFFF,
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+ side: THREE.FrontSide,
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+ vertexColors: THREE.VertexColors,
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+ }));
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+ this._plane.position.add(params.offset);
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+ this._plane.castShadow = false;
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+ this._plane.receiveShadow = true;
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+ params.group.add(this._plane);
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+
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+ const _colourLerp = (t, p0, p1) => {
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+ const c = p0.clone();
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+
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+ return c.lerpHSL(p1, t);
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+ };
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+ this._colourSpline = [
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+ new spline.LinearSpline(_colourLerp),
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+ new spline.LinearSpline(_colourLerp)
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+ ];
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+ // Arid
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+ this._colourSpline[0].AddPoint(0.0, new THREE.Color(0xb7a67d));
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+ this._colourSpline[0].AddPoint(0.5, new THREE.Color(0xf1e1bc));
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+ this._colourSpline[0].AddPoint(1.0, _SNOW);
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+
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+ // Humid
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+ this._colourSpline[1].AddPoint(0.0, _FOREST_BOREAL);
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+ this._colourSpline[1].AddPoint(0.5, new THREE.Color(0xcee59c));
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+ this._colourSpline[1].AddPoint(1.0, _SNOW);
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+
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+ this.Rebuild();
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+ }
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+
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+ _ChooseColour(x, y, z) {
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+ return _WHITE;
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+ const m = this._params.biomeGenerator.Get(x, z);
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+ const h = y / 100.0;
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+
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+ if (h < 0.05) {
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+ return _OCEAN;
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+ }
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+
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+ const c1 = this._colourSpline[0].Get(h);
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+ const c2 = this._colourSpline[1].Get(h);
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+
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+ return c1.lerpHSL(c2, m);
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+ }
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+
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+ Rebuild() {
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+ const colours = [];
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+ const offset = this._params.offset;
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+ for (let v of this._plane.geometry.vertices) {
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+ const heightPairs = [];
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+ let normalization = 0;
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+ v.z = 0;
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+ for (let gen of this._params.heightGenerators) {
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+ heightPairs.push(gen.Get(v.x + offset.x, v.y + offset.y));
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+ normalization += heightPairs[heightPairs.length-1][1];
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+ }
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+
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+ if (normalization > 0) {
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+ for (let h of heightPairs) {
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+ v.z += h[0] * h[1] / normalization;
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+ }
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+ }
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+
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+ colours.push(this._ChooseColour(v.x + offset.x, v.z, v.y + offset.y));
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+ }
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+
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+ for (let f of this._plane.geometry.faces) {
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+ const vs = [f.a, f.b, f.c];
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+
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+ const vertexColours = [];
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+ for (let v of vs) {
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+ vertexColours.push(colours[v]);
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+ }
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+ f.vertexColors = vertexColours;
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+ }
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+ this._plane.geometry.elementsNeedUpdate = true;
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+ this._plane.geometry.verticesNeedUpdate = true;
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+ this._plane.geometry.computeVertexNormals();
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+ }
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+}
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+
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+class TerrainChunkManager {
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+ constructor(params) {
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+ this._chunkSize = 500;
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+ this._Init(params);
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+ }
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+
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+ _Init(params) {
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+ this._InitNoise(params);
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+ this._InitBiomes(params);
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+ this._InitTerrain(params);
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+ }
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+
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+ _InitNoise(params) {
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+ params.guiParams.noise = {
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+ octaves: 6,
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+ persistence: 0.707,
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+ lacunarity: 1.8,
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+ exponentiation: 4.5,
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+ height: 300.0,
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+ scale: 800.0,
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+ noiseType: 'simplex',
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+ seed: 1
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+ };
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+
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+ const onNoiseChanged = () => {
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+ for (let k in this._chunks) {
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+ this._chunks[k].chunk.Rebuild();
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+ }
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+ };
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+
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+ const noiseRollup = params.gui.addFolder('Terrain.Noise');
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+ noiseRollup.add(params.guiParams.noise, "noiseType", ['simplex', 'perlin', 'rand']).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.noise, "scale", 32.0, 4096.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.noise, "octaves", 1, 20, 1).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.noise, "persistence", 0.25, 1.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.noise, "lacunarity", 0.01, 4.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.noise, "exponentiation", 0.1, 10.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.noise, "height", 0, 512).onChange(
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+ onNoiseChanged);
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+
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+ this._noise = new noise.Noise(params.guiParams.noise);
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+
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+ params.guiParams.heightmap = {
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+ height: 16,
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+ };
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+
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+ const heightmapRollup = params.gui.addFolder('Terrain.Heightmap');
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+ heightmapRollup.add(params.guiParams.heightmap, "height", 0, 128).onChange(
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+ onNoiseChanged);
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+ }
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+
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+ _InitBiomes(params) {
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+ params.guiParams.biomes = {
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+ octaves: 2,
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+ persistence: 0.5,
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+ lacunarity: 2.0,
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+ exponentiation: 3.9,
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+ scale: 2048.0,
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+ noiseType: 'simplex',
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+ seed: 2,
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+ exponentiation: 1,
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+ height: 1
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+ };
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+
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+ const onNoiseChanged = () => {
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+ for (let k in this._chunks) {
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+ this._chunks[k].chunk.Rebuild();
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+ }
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+ };
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+
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+ const noiseRollup = params.gui.addFolder('Terrain.Biomes');
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+ noiseRollup.add(params.guiParams.biomes, "scale", 64.0, 4096.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.biomes, "octaves", 1, 20, 1).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.biomes, "persistence", 0.01, 1.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.biomes, "lacunarity", 0.01, 4.0).onChange(
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+ onNoiseChanged);
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+ noiseRollup.add(params.guiParams.biomes, "exponentiation", 0.1, 10.0).onChange(
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+ onNoiseChanged);
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+
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+ this._biomes = new noise.Noise(params.guiParams.biomes);
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+ }
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+
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+ _InitTerrain(params) {
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+ params.guiParams.terrain= {
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+ wireframe: false,
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+ };
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+
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+ this._group = new THREE.Group()
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+ this._group.rotation.x = -Math.PI / 2;
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+ params.scene.add(this._group);
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+
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+ const terrainRollup = params.gui.addFolder('Terrain');
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+ terrainRollup.add(params.guiParams.terrain, "wireframe").onChange(() => {
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+ for (let k in this._chunks) {
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+ this._chunks[k].chunk._plane.material.wireframe = params.guiParams.terrain.wireframe;
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+ }
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+ });
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+
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+ this._chunks = {};
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+ this._params = params;
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+
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+ const w = 0;
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+
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+ for (let x = -w; x <= w; x++) {
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+ for (let z = -w; z <= w; z++) {
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+ this._AddChunk(x, z);
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+ }
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+ }
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+ }
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+
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+ _Key(x, z) {
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+ return x + '.' + z;
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+ }
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+
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+ _AddChunk(x, z) {
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+ const offset = new THREE.Vector2(x * this._chunkSize, z * this._chunkSize);
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+ const chunk = new TerrainChunk({
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+ group: this._group,
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+ offset: new THREE.Vector3(offset.x, offset.y, 0),
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+ scale: 1,
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+ width: this._chunkSize,
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+ biomeGenerator: this._biomes,
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+ heightGenerators: [new HeightGenerator(this._noise, offset, 100000, 100000 + 1)],
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+ });
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+
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+ const k = this._Key(x, z);
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+ const edges = [];
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+ for (let xi = -1; xi <= 1; xi++) {
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+ for (let zi = -1; zi <= 1; zi++) {
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+ if (xi == 0 || zi == 0) {
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+ continue;
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+ }
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+ edges.push(this._Key(x + xi, z + zi));
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+ }
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+ }
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+
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+ this._chunks[k] = {
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+ chunk: chunk,
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+ edges: edges
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+ };
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+ }
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+
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+ SetHeightmap(img) {
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+ const heightmap = new HeightGenerator(
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+ new Heightmap(this._params.guiParams.heightmap, img),
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+ new THREE.Vector2(0, 0), 250, 300);
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+
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+ for (let k in this._chunks) {
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+ this._chunks[k].chunk._params.heightGenerators.unshift(heightmap);
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+ this._chunks[k].chunk.Rebuild();
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+ }
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+ }
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+
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+ Update(timeInSeconds) {
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+ }
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+}
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+
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+
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+class TerrainSky {
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+ constructor(params) {
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+ this._Init(params);
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+ }
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+
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+ _Init(params) {
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+ this._sky = new Sky();
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+ this._sky.scale.setScalar(10000);
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+ params.scene.add(this._sky);
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+
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+ params.guiParams.sky = {
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+ turbidity: 10.0,
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+ rayleigh: 2,
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+ mieCoefficient: 0.005,
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+ mieDirectionalG: 0.8,
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+ luminance: 1,
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+ };
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+
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+ params.guiParams.sun = {
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+ inclination: 0.31,
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+ azimuth: 0.25,
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+ };
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+
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+ const onShaderChange = () => {
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+ for (let k in params.guiParams.sky) {
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+ this._sky.material.uniforms[k].value = params.guiParams.sky[k];
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+ }
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+ for (let k in params.guiParams.general) {
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+ this._sky.material.uniforms[k].value = params.guiParams.general[k];
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+ }
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+ };
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+
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+ const onSunChange = () => {
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+ var theta = Math.PI * (params.guiParams.sun.inclination - 0.5);
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+ var phi = 2 * Math.PI * (params.guiParams.sun.azimuth - 0.5);
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|
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+
|
|
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+ const sunPosition = new THREE.Vector3();
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|
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+ sunPosition.x = Math.cos(phi);
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|
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+ sunPosition.y = Math.sin(phi) * Math.sin(theta);
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|
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+ sunPosition.z = Math.sin(phi) * Math.cos(theta);
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|
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+
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|
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+ this._sky.material.uniforms['sunPosition'].value.copy(sunPosition);
|
|
|
+ };
|
|
|
+
|
|
|
+ const skyRollup = params.gui.addFolder('Sky');
|
|
|
+ skyRollup.add(params.guiParams.sky, "turbidity", 0.1, 30.0).onChange(
|
|
|
+ onShaderChange);
|
|
|
+ skyRollup.add(params.guiParams.sky, "rayleigh", 0.1, 4.0).onChange(
|
|
|
+ onShaderChange);
|
|
|
+ skyRollup.add(params.guiParams.sky, "mieCoefficient", 0.0001, 0.1).onChange(
|
|
|
+ onShaderChange);
|
|
|
+ skyRollup.add(params.guiParams.sky, "mieDirectionalG", 0.0, 1.0).onChange(
|
|
|
+ onShaderChange);
|
|
|
+ skyRollup.add(params.guiParams.sky, "luminance", 0.0, 2.0).onChange(
|
|
|
+ onShaderChange);
|
|
|
+
|
|
|
+ const sunRollup = params.gui.addFolder('Sun');
|
|
|
+ sunRollup.add(params.guiParams.sun, "inclination", 0.0, 1.0).onChange(
|
|
|
+ onSunChange);
|
|
|
+ sunRollup.add(params.guiParams.sun, "azimuth", 0.0, 1.0).onChange(
|
|
|
+ onSunChange);
|
|
|
+
|
|
|
+ onShaderChange();
|
|
|
+ onSunChange();
|
|
|
+ }
|
|
|
+
|
|
|
+ Update(timeInSeconds) {
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+class ProceduralTerrain_Demo extends game.Game {
|
|
|
+ constructor() {
|
|
|
+ super();
|
|
|
+ }
|
|
|
+
|
|
|
+ _OnInitialize() {
|
|
|
+ this._controls = this._CreateControls();
|
|
|
+ this._CreateGUI();
|
|
|
+
|
|
|
+ this._entities['_terrain'] = new TerrainChunkManager({
|
|
|
+ scene: this._graphics.Scene,
|
|
|
+ gui: this._gui,
|
|
|
+ guiParams: this._guiParams,
|
|
|
+ });
|
|
|
+
|
|
|
+ this._entities['_sky'] = new TerrainSky({
|
|
|
+ scene: this._graphics.Scene,
|
|
|
+ gui: this._gui,
|
|
|
+ guiParams: this._guiParams,
|
|
|
+ });
|
|
|
+ this._LoadBackground();
|
|
|
+ }
|
|
|
+
|
|
|
+ _CreateGUI() {
|
|
|
+ this._guiParams = {
|
|
|
+ general: {
|
|
|
+ },
|
|
|
+ };
|
|
|
+ this._gui = new GUI();
|
|
|
+
|
|
|
+ const generalRollup = this._gui.addFolder('General');
|
|
|
+ this._gui.close();
|
|
|
+ }
|
|
|
+
|
|
|
+ _CreateControls() {
|
|
|
+ const controls = new OrbitControls(
|
|
|
+ this._graphics._camera, this._graphics._threejs.domElement);
|
|
|
+ controls.target.set(0, 50, 0);
|
|
|
+ controls.object.position.set(475, 345, 900);
|
|
|
+ controls.update();
|
|
|
+ return controls;
|
|
|
+ }
|
|
|
+
|
|
|
+ _LoadBackground() {
|
|
|
+ }
|
|
|
+
|
|
|
+ _OnStep(timeInSeconds) {
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+function _Main() {
|
|
|
+ _APP = new ProceduralTerrain_Demo();
|
|
|
+}
|
|
|
+
|
|
|
+_Main();
|
simondevyoutube
