| <!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> |
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