samien
/
three.js
зеркало из https://github.com/mrdoob/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js ray cast - texture - canvas</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				color: #808080;
				font-family:Monospace;
				font-size:13px;
				text-align:center;

				background-color: #ffffff;
				margin: 0px;
				overflow: hidden;
			}

			#info {
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
			}
		</style>
	</head>
	<body>
		<div id="container"></div>
		<div id="info"><a href="http://threejs.org" target="_blank">three.js</a> - texture intersection<br>Left to right: buffer geometry - geometry - indexed buffer geometry</div>
		<!--<script src="../build/three.min.js"></script>-->
		<script src="../build/three.js"></script>
		<script>
			CanvasTexture = function(parentTexture) {
				this._canvas = document.createElement("canvas");
				this._context2D = this._canvas.getContext("2d");

				if (parentTexture) {
					this._parentTexture.push(parentTexture);
					parentTexture.image = this._canvas;
				}

				var that = this;
				this._background = document.createElement("img");
				this._background.addEventListener("load", function (event) {
					that._canvas.width = that._background.naturalWidth;
					that._canvas.height = that._background.naturalHeight;
				
					that._rayonviseur = Math.ceil(Math.min(that._canvas.width, that._canvas.height / 30));
					that._exterieurCroix = Math.ceil(0.70710678 * that._rayonviseur);
					that._interieurCroix = Math.ceil(that._exterieurCroix / 10);
					that._epaisseurViseur = Math.ceil(that._exterieurCroix / 10);
					
					that._draw();
				}, false);
				this._background.crossOrigin = '';
				this._background.src = "textures/UV_Grid_Sm.jpg";

				this._draw();
			}


			CanvasTexture.prototype = {

				constructor: CanvasTexture,

				_canvas: null,
				_context2D: null,
				_xCross: 0,
				_yCross: 0,
				
				_rayonviseur: 57,
				_exterieurCroix: 40,
				_interieurCroix: 4,
				_epaisseurViseur: 4,

				_parentTexture: [],

				addParent: function (parentTexture) {
					if (this._parentTexture.indexOf(parentTexture) === -1) {
						this._parentTexture.push(parentTexture);
						parentTexture.image = this._canvas;
					}
				 },
				
				setCrossPosition: function (x, y) {
					this._xCross = x * this._canvas.width;
					this._yCross = y * this._canvas.height;
					
					this._draw();
				},
				
				_draw: function () {
					if (!this._context2D) return;

					this._context2D.clearRect(0, 0, this._canvas.width, this._canvas.height)

					// Background.
					this._context2D.drawImage(this._background, 0, 0);

					// White cross.
					this._context2D.lineWidth = this._epaisseurViseur * 3;
					this._context2D.strokeStyle = "#FFFFFF";

					this._context2D.beginPath();
					this._context2D.moveTo(this._xCross - this._exterieurCroix - 2, this._yCross - this._exterieurCroix -2);
					this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross - this._interieurCroix);

					this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross + this._interieurCroix);
					this._context2D.lineTo(this._xCross + this._exterieurCroix + 2, this._yCross + this._exterieurCroix + 2);

					this._context2D.moveTo(this._xCross - this._exterieurCroix - 2, this._yCross + this._exterieurCroix + 2);
					this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross + this._interieurCroix);

					this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross - this._interieurCroix);
					this._context2D.lineTo(this._xCross + this._exterieurCroix + 2, this._yCross - this._exterieurCroix - 2);

					this._context2D.stroke();
					
					// Black cross.
					this._context2D.lineWidth = this._epaisseurViseur;
					this._context2D.strokeStyle = "#000000";

					this._context2D.beginPath();
					this._context2D.moveTo(this._xCross - this._exterieurCroix, this._yCross - this._exterieurCroix);
					this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross - this._interieurCroix);

					this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross + this._interieurCroix);
					this._context2D.lineTo(this._xCross + this._exterieurCroix, this._yCross + this._exterieurCroix);

					this._context2D.moveTo(this._xCross - this._exterieurCroix, this._yCross + this._exterieurCroix);
					this._context2D.lineTo(this._xCross - this._interieurCroix, this._yCross + this._interieurCroix);

					this._context2D.moveTo(this._xCross + this._interieurCroix, this._yCross - this._interieurCroix);
					this._context2D.lineTo(this._xCross + this._exterieurCroix, this._yCross - this._exterieurCroix);

					this._context2D.stroke();
					
					for (var i = 0; i < this._parentTexture.length; i++) {
						//this._parentTexture[i].image = this._canvas;
						this._parentTexture[i].needsUpdate = true;
					}

				}

			}
		</script>
		<script>

			var container = document.getElementById("container");
			var width = window.innerWidth;
			var height = window.innerHeight ;
			var objects = [];

			var scene = new THREE.Scene();
			var camera = new THREE.PerspectiveCamera(45, width / height, 1, 1000);
			camera.position.x = -30;
			camera.position.y = 40;
			camera.position.z = 50;
			camera.lookAt(scene.position);

			var raycaster = new THREE.Raycaster();
			var mouse = new THREE.Vector2();
			var onClickPosition = new THREE.Vector2();

			var getMousePosition = function (dom, x, y) {
				var rect = dom.getBoundingClientRect();
				return [(x - rect.left) / rect.width, (y - rect.top) / rect.height];
			};

			var getIntersects = function (point, objects) {
				mouse.set((point.x * 2) - 1, -(point.y * 2) + 1);

				raycaster.setFromCamera(mouse, camera);

				return raycaster.intersectObjects(objects);
			};

			window.addEventListener('resize', function(evt) {
				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );
			}, false);

			container.addEventListener('click', function(evt) {
				evt.preventDefault();

				var array = getMousePosition(container, evt.clientX, evt.clientY);
				onClickPosition.fromArray(array);

				var intersects = getIntersects(onClickPosition, objects);
				if (intersects.length > 0) {
					if (intersects[0].uv) {
						var uv = intersects[0].uv;
						intersects[0].object.material.map.transformUv(uv);
						canvas.setCrossPosition(uv.x, uv.y);
					}
				}
			}, false);


			var renderer = new THREE.WebGLRenderer();
			renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
			renderer.setSize(width, height);
			container.appendChild(renderer.domElement);

			// A cube, in the middle.
			var cubeTexture = new THREE.Texture(undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.RepeatWrapping);
			var canvas = new CanvasTexture(cubeTexture);
			var cubeMaterial = new THREE.MeshBasicMaterial( { map: cubeTexture } );
			var cubeGeometry = new THREE.BoxGeometry(20, 20, 20);
			// Set a specific texture mapping.
			var uvs;
			for (var i = 0; i < cubeGeometry.faceVertexUvs[0].length; i++) {
				uvs = cubeGeometry.faceVertexUvs[0][i];
				for (var j = 0; j < 3; j++) {
					if (uvs[j].x < 0.1) uvs[j].x = -1;
					if (uvs[j].y < 0.1) uvs[j].y = -1;
				}
			}
			var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
			cube.position.x = 4;
			cube.position.y = -5;
			cube.position.z = 0;
			objects.push(cube);
			scene.add(cube);

			// A plane on the left.
			var planeTexture = new THREE.Texture(undefined, THREE.UVMapping, THREE.MirroredRepeatWrapping, THREE.MirroredRepeatWrapping);
			canvas.addParent(planeTexture);
			var planeMaterial = new THREE.MeshBasicMaterial( { map: planeTexture } );
			var planeGeometry = new THREE.PlaneBufferGeometry(25, 25, 1, 1);
			var uvs = planeGeometry.attributes.uv.array;
			for (var i = 0; i < uvs.length; i++) {
				//if (uvs[i] < 0.1) uvs[i] = -1;
				uvs[i] *= 2;
			}
			var plane = new THREE.Mesh(planeGeometry, planeMaterial);
			plane.position.x = -16;
			plane.position.y = -5;
			plane.position.z = 0;
			objects.push(plane);
			scene.add(plane);

			// A circle on the left.
			var circleTexture = new THREE.Texture(undefined, THREE.UVMapping, THREE.RepeatWrapping, THREE.MirroredRepeatWrapping);
			canvas.addParent(circleTexture);
			var circleMaterial = new THREE.MeshBasicMaterial( { map: circleTexture } );
			var circleGeometry = new THREE.CircleBufferGeometry(25, 40, 0, Math.PI * 2);
			var uvs = circleGeometry.attributes.uv.array;
			for (var i = 0; i < uvs.length; i++) {
				uvs[i] *= 2;
			}
			var circle = new THREE.Mesh(circleGeometry, circleMaterial);
			circle.position.x = 24;
			circle.position.y = -5;
			circle.position.z = 0;
			objects.push(circle);
			scene.add(circle);
			
			render();

			function render() {
				requestAnimationFrame(render);
				renderer.render(scene, camera);
			};

		</script>
	</body>
</html>