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<!DOCTYPE html> |
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<html> |
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<head> |
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<meta charset="utf-8" /> |
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<title>Babylon.js L-system Fractal Example</title> |
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<script src="https://cdn.babylonjs.com/babylon.js"></script> |
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<script src="https://cdn.babylonjs.com/loaders/babylonjs.loaders.min.js"></script> |
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<style> |
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canvas { |
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width: 100%; |
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height: 100%; |
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touch-action: none; |
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} |
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</style> |
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</head> |
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<body> |
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<canvas id="renderCanvas"></canvas> |
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<script> |
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window.addEventListener('DOMContentLoaded', function () { |
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var canvas = document.getElementById('renderCanvas'); |
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var engine = new BABYLON.Engine(canvas, true); |
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var createScene = function () { |
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var scene = new BABYLON.Scene(engine); |
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var camera = new BABYLON.ArcRotateCamera("Camera", 0, 0, 10, BABYLON.Vector3.Zero(), scene); |
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var light = new BABYLON.HemisphericLight("light1", new BABYLON.Vector3(0, 1, 0), scene); |
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var spheres = []; |
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var texture = new BABYLON.Texture("https://www.babylonjs-playground.com/textures/floor.png", scene); |
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var bumpMap = new BABYLON.Texture("https://www.babylonjs-playground.com/textures/floor_n.jpg", scene); |
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var rules = { |
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F: "F+F-F-F+F" |
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}; |
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var axiom = "F-F-F-F"; |
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var angle = Math.PI / 2; |
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var length = 1; |
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var iterations = 3; |
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var lSystemString = axiom; |
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for (var i = 0; i < iterations; i++) { |
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var newString = ""; |
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for (var j = 0; j < lSystemString.length; j++) { |
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var char = lSystemString.charAt(j); |
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if (rules[char]) { |
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newString += rules[char]; |
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} else { |
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newString += char; |
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} |
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} |
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lSystemString = newString; |
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} |
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var position = BABYLON.Vector3.Zero(); |
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var direction = BABYLON.Vector3.Forward(); |
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for (var i = 0; i < lSystemString.length; i++) { |
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var char = lSystemString.charAt(i); |
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if (char === "F") { |
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var sphere = BABYLON.MeshBuilder.CreateSphere("sphere", {diameter: length, segments: 16}, scene); |
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sphere.position = position.clone(); |
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sphere.material = new BABYLON.StandardMaterial("texture", scene); |
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sphere.material.diffuseTexture = texture; |
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sphere.material.bumpTexture = bumpMap; |
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spheres.push(sphere); |
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var textureAnimation = new BABYLON.Animation("textureAnimation", "material.diffuseTexture.uOffset", 60, BABYLON.Animation.ANIMATIONTYPE_FLOAT, BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE); |
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var keys = []; |
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keys.push({frame: 0, value:0}); |
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keys.push({frame: 100, value: 1}); |
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textureAnimation.setKeys(keys); |
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sphere.material.diffuseTexture.wrapU = BABYLON.Texture.WRAP_ADDRESSMODE; |
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sphere.material.diffuseTexture.wrapV = BABYLON.Texture.WRAP_ADDRESSMODE; |
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sphere.material.diffuseTexture.uScale = 10; |
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sphere.material.diffuseTexture.vScale = 10; |
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sphere.animations.push(textureAnimation); |
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scene.beginAnimation(sphere, 0, 100, true); |
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var animation = new BABYLON.Animation("myAnimation", "position", 30, BABYLON.Animation.ANIMATIONTYPE_VECTOR3, BABYLON.Animation.ANIMATIONLOOPMODE_CYCLE); |
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keys = []; |
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keys.push({frame: 0, value: position.clone()}); |
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position.addInPlace(direction.scale(length)); |
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keys.push({frame: 100, value: position.clone()}); |
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animation.setKeys(keys); |
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sphere.animations.push(animation); |
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scene.beginAnimation(sphere, 0, 100, true); |
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} else if (char === "+") { |
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direction.rotateByQuaternionToRef(BABYLON.Quaternion.RotationAxis(BABYLON.Vector3.Up(), -angle), direction); |
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} else if (char === "-") { |
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direction.rotateByQuaternionToRef(BABYLON.Quaternion.RotationAxis(BABYLON.Vector3.Up(), angle), direction); |
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} |
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} |
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return scene; |
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} |
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var scene = createScene(); |
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engine.runRenderLoop(function () { |
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scene.render(); |
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}); |
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window.addEventListener('resize', function () { |
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engine.resize(); |
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}); |
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}); |
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</script> |
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</body> |
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</html> |
