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+<!-- Licensed under a BSD license. See license.html for license -->
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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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+ <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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+ <title>Three.js - Canvas Textured Labels One Canvas</title>
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+ <style>
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+ body {
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+ margin: 0;
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+ }
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+ #c {
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+ width: 100vw;
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+ height: 100vh;
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+ display: block;
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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="c"></canvas>
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+ </body>
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+<script src="resources/threejs/r102/three.min.js"></script>
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+<script src="resources/threejs/r102/js/controls/OrbitControls.js"></script>
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+<script>
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+'use strict';
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+
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+/* global THREE */
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+
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+function main() {
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+ const canvas = document.querySelector('#c');
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+ const renderer = new THREE.WebGLRenderer({canvas: canvas});
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+
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+ const fov = 75;
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+ const aspect = 2; // the canvas default
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+ const near = 0.1;
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+ const far = 50;
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+ const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
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+ camera.position.set(0, 2, 5);
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+
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+ const controls = new THREE.OrbitControls(camera, canvas);
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+ controls.target.set(0, 2, 0);
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+ controls.update();
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+
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+ const scene = new THREE.Scene();
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+ scene.background = new THREE.Color('white');
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+
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+ function addLight(position) {
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+ const color = 0xFFFFFF;
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+ const intensity = 1;
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+ const light = new THREE.DirectionalLight(color, intensity);
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+ light.position.set(...position);
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+ scene.add(light);
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+ scene.add(light.target);
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+ }
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+ addLight([-3, 1, 1]);
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+ addLight([ 2, 1, .5]);
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+
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+ const bodyRadiusTop = .4;
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+ const bodyRadiusBottom = .2;
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+ const bodyHeight = 2;
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+ const bodyRadialSegments = 6;
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+ const bodyGeometry = new THREE.CylinderBufferGeometry(
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+ bodyRadiusTop, bodyRadiusBottom, bodyHeight, bodyRadialSegments);
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+
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+ const headRadius = bodyRadiusTop * 0.8;
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+ const headLonSegments = 12;
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+ const headLatSegments = 5;
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+ const headGeometry = new THREE.SphereBufferGeometry(
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+ headRadius, headLonSegments, headLatSegments);
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+
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+ const labelGeometry = new THREE.PlaneBufferGeometry(1, 1);
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+
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+ const ctx = document.createElement('canvas').getContext('2d');
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+
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+ function makeLabelCanvas(baseWidth, size, name) {
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+ const borderSize = 2;
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+ const font = `${size}px bold sans-serif`;
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+ ctx.font = font;
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+ // measure how long the name will be
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+ const textWidth = ctx.measureText(name).width;
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+
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+ const doubleBorderSize = borderSize * 2;
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+ const width = baseWidth + doubleBorderSize;
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+ const height = size + doubleBorderSize;
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+ ctx.canvas.width = width;
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+ ctx.canvas.height = height;
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+
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+ // need to set font again after resizing canvas
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+ ctx.font = font;
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+ ctx.textBaseline = 'middle';
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+ ctx.textAlign = 'center';
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+
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+ ctx.fillStyle = 'blue';
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+ ctx.fillRect(0, 0, width, height);
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+
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+ // scale to fit but don't stretch
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+ const scaleFactor = Math.min(1, baseWidth / textWidth);
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+ ctx.translate(width / 2, height / 2);
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+ ctx.scale(scaleFactor, 1);
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+ ctx.fillStyle = 'white';
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+ ctx.fillText(name, 0, 0);
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+
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+ return ctx.canvas;
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+ }
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+
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+ function makePerson(x, labelWidth, size, name, color) {
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+ const canvas = makeLabelCanvas(labelWidth, size, name);
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+ const texture = new THREE.CanvasTexture(canvas);
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+ // because our canvas is likely not a power of 2
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+ // in both dimensions set the filtering appropriately.
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+ texture.minFilter = THREE.LinearFilter;
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+ texture.wrapS = THREE.ClampToEdgeWrapping;
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+ texture.wrapT = THREE.ClampToEdgeWrapping;
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+ renderer.setTexture2D(texture, 0);
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+
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+ const labelMaterial = new THREE.MeshBasicMaterial({
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+ map: texture,
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+ side: THREE.DoubleSide,
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+ transparent: true,
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+ });
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+ const bodyMaterial = new THREE.MeshPhongMaterial({
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+ color,
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+ flatShading: true,
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+ });
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+
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+ const root = new THREE.Object3D();
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+ root.position.x = x;
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+
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+ const body = new THREE.Mesh(bodyGeometry, bodyMaterial);
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+ root.add(body);
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+ body.position.y = bodyHeight / 2;
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+
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+ const head = new THREE.Mesh(headGeometry, bodyMaterial);
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+ root.add(head);
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+ head.position.y = bodyHeight + headRadius * 1.1;
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+
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+ const label = new THREE.Mesh(labelGeometry, labelMaterial);
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+ root.add(label);
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+ label.position.y = bodyHeight * 4 / 5;
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+ label.position.z = bodyRadiusTop * 1.01;
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+
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+ // if units are meters then 0.01 here makes size
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+ // of the label into centimeters.
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+ const labelBaseScale = 0.01;
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+ label.scale.x = canvas.width * labelBaseScale;
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+ label.scale.y = canvas.height * labelBaseScale;
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+
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+ scene.add(root);
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+ return root;
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+ }
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+
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+ makePerson(-3, 150, 32, 'Purple People Eater', 'purple');
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+ makePerson(-0, 150, 32, 'Green Machine', 'green');
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+ makePerson(+3, 150, 32, 'Red Menace', 'red');
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+
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+ function resizeRendererToDisplaySize(renderer) {
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+ const canvas = renderer.domElement;
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+ const width = canvas.clientWidth;
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+ const height = canvas.clientHeight;
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+ const needResize = canvas.width !== width || canvas.height !== height;
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+ if (needResize) {
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+ renderer.setSize(width, height, false);
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+ }
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+ return needResize;
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+ }
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+
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+
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+ function render() {
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+ if (resizeRendererToDisplaySize(renderer)) {
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+ const canvas = renderer.domElement;
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+ camera.aspect = canvas.clientWidth / canvas.clientHeight;
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+ camera.updateProjectionMatrix();
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+ }
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+
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+ renderer.render(scene, camera);
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+
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+ requestAnimationFrame(render);
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+ }
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+
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+ requestAnimationFrame(render);
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+}
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+
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+main();
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+</script>
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+</html>
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+
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Gregg Tavares