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