You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
186 lines
5.1 KiB
186 lines
5.1 KiB
<!-- Licensed under a BSD license. See license.html for license -->
|
|
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
|
<title>Three.js - Canvas Textured Labels</title>
|
|
<style>
|
|
html, body {
|
|
height: 100%;
|
|
margin: 0;
|
|
}
|
|
#c {
|
|
width: 100%;
|
|
height: 100%;
|
|
display: block;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<canvas id="c"></canvas>
|
|
</body>
|
|
<!-- Import maps polyfill -->
|
|
<!-- Remove this when import maps will be widely supported -->
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
|
|
|
|
<script type="importmap">
|
|
{
|
|
"imports": {
|
|
"three": "../../build/three.module.js",
|
|
"three/addons/": "../../examples/jsm/"
|
|
}
|
|
}
|
|
</script>
|
|
|
|
<script type="module">
|
|
import * as THREE from 'three';
|
|
import {OrbitControls} from 'three/addons/controls/OrbitControls.js';
|
|
|
|
function main() {
|
|
const canvas = document.querySelector('#c');
|
|
const renderer = new THREE.WebGLRenderer({canvas});
|
|
|
|
const fov = 75;
|
|
const aspect = 2; // the canvas default
|
|
const near = 0.1;
|
|
const far = 50;
|
|
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
|
|
camera.position.set(0, 2, 5);
|
|
|
|
const controls = new OrbitControls(camera, canvas);
|
|
controls.target.set(0, 2, 0);
|
|
controls.update();
|
|
|
|
const scene = new THREE.Scene();
|
|
scene.background = new THREE.Color('white');
|
|
|
|
function addLight(position) {
|
|
const color = 0xFFFFFF;
|
|
const intensity = 1;
|
|
const light = new THREE.DirectionalLight(color, intensity);
|
|
light.position.set(...position);
|
|
scene.add(light);
|
|
scene.add(light.target);
|
|
}
|
|
addLight([-3, 1, 1]);
|
|
addLight([ 2, 1, .5]);
|
|
|
|
const bodyRadiusTop = .4;
|
|
const bodyRadiusBottom = .2;
|
|
const bodyHeight = 2;
|
|
const bodyRadialSegments = 6;
|
|
const bodyGeometry = new THREE.CylinderGeometry(
|
|
bodyRadiusTop, bodyRadiusBottom, bodyHeight, bodyRadialSegments);
|
|
|
|
const headRadius = bodyRadiusTop * 0.8;
|
|
const headLonSegments = 12;
|
|
const headLatSegments = 5;
|
|
const headGeometry = new THREE.SphereGeometry(
|
|
headRadius, headLonSegments, headLatSegments);
|
|
|
|
const labelGeometry = new THREE.PlaneGeometry(1, 1);
|
|
|
|
function makeLabelCanvas(size, name) {
|
|
const borderSize = 2;
|
|
const ctx = document.createElement('canvas').getContext('2d');
|
|
const font = `${size}px bold sans-serif`;
|
|
ctx.font = font;
|
|
// measure how long the name will be
|
|
const doubleBorderSize = borderSize * 2;
|
|
const width = ctx.measureText(name).width + doubleBorderSize;
|
|
const height = size + doubleBorderSize;
|
|
ctx.canvas.width = width;
|
|
ctx.canvas.height = height;
|
|
|
|
// need to set font again after resizing canvas
|
|
ctx.font = font;
|
|
ctx.textBaseline = 'top';
|
|
|
|
ctx.fillStyle = 'blue';
|
|
ctx.fillRect(0, 0, width, height);
|
|
ctx.fillStyle = 'white';
|
|
ctx.fillText(name, borderSize, borderSize);
|
|
|
|
return ctx.canvas;
|
|
}
|
|
|
|
function makePerson(x, size, name, color) {
|
|
const canvas = makeLabelCanvas(size, name);
|
|
const texture = new THREE.CanvasTexture(canvas);
|
|
// because our canvas is likely not a power of 2
|
|
// in both dimensions set the filtering appropriately.
|
|
texture.minFilter = THREE.LinearFilter;
|
|
texture.wrapS = THREE.ClampToEdgeWrapping;
|
|
texture.wrapT = THREE.ClampToEdgeWrapping;
|
|
|
|
const labelMaterial = new THREE.MeshBasicMaterial({
|
|
map: texture,
|
|
side: THREE.DoubleSide,
|
|
transparent: true,
|
|
});
|
|
const bodyMaterial = new THREE.MeshPhongMaterial({
|
|
color,
|
|
flatShading: true,
|
|
});
|
|
|
|
const root = new THREE.Object3D();
|
|
root.position.x = x;
|
|
|
|
const body = new THREE.Mesh(bodyGeometry, bodyMaterial);
|
|
root.add(body);
|
|
body.position.y = bodyHeight / 2;
|
|
|
|
const head = new THREE.Mesh(headGeometry, bodyMaterial);
|
|
root.add(head);
|
|
head.position.y = bodyHeight + headRadius * 1.1;
|
|
|
|
const label = new THREE.Mesh(labelGeometry, labelMaterial);
|
|
root.add(label);
|
|
label.position.y = bodyHeight * 4 / 5;
|
|
label.position.z = bodyRadiusTop * 1.01;
|
|
|
|
// if units are meters then 0.01 here makes size
|
|
// of the label into centimeters.
|
|
const labelBaseScale = 0.01;
|
|
label.scale.x = canvas.width * labelBaseScale;
|
|
label.scale.y = canvas.height * labelBaseScale;
|
|
|
|
scene.add(root);
|
|
return root;
|
|
}
|
|
|
|
makePerson(-3, 32, 'Purple People Eater', 'purple');
|
|
makePerson(-0, 32, 'Green Machine', 'green');
|
|
makePerson(+3, 32, 'Red Menace', 'red');
|
|
|
|
function resizeRendererToDisplaySize(renderer) {
|
|
const canvas = renderer.domElement;
|
|
const width = canvas.clientWidth;
|
|
const height = canvas.clientHeight;
|
|
const needResize = canvas.width !== width || canvas.height !== height;
|
|
if (needResize) {
|
|
renderer.setSize(width, height, false);
|
|
}
|
|
return needResize;
|
|
}
|
|
|
|
function render() {
|
|
if (resizeRendererToDisplaySize(renderer)) {
|
|
const canvas = renderer.domElement;
|
|
camera.aspect = canvas.clientWidth / canvas.clientHeight;
|
|
camera.updateProjectionMatrix();
|
|
}
|
|
|
|
renderer.render(scene, camera);
|
|
|
|
requestAnimationFrame(render);
|
|
}
|
|
|
|
requestAnimationFrame(render);
|
|
}
|
|
|
|
main();
|
|
</script>
|
|
</html>
|
|
|
|
|