three.js/manual/examples/debug-js-html-elements.html at dev · mrdoob/three.js · GitHub

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<!-- 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 - Debug - HTML Elements</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    #debug {
      position: absolute;
      left: 1em;
      top: 1em;
      padding: 1em;
      background: rgba(0, 0, 0, 0.9);
      color: white;
      font-family: monospace;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
    <div id="debug">
      <div>x:<span id="x"></span></div>
      <div>y:<span id="y"></span></div>
      <div>z:<span id="z"></span></div>
    </div>
  </body>
<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js"
  }
}
</script>

<script type="module">
import * as THREE from 'three';

function main() {

	const canvas = document.querySelector( '#c' );
	const renderer = new THREE.WebGLRenderer( { antialias: true, 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.z = 20;

	const scene = new THREE.Scene();
	scene.background = new THREE.Color( 'red' );

	const geometry = new THREE.SphereGeometry();
	const material = new THREE.MeshBasicMaterial( { color: 'yellow' } );

	const mesh = new THREE.Mesh( geometry, material );
	scene.add( mesh );

	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;

	}

	const xElem = document.querySelector( '#x' );
	const yElem = document.querySelector( '#y' );
	const zElem = document.querySelector( '#z' );

	function render( time ) {

		time *= 0.001; // convert to seconds

		if ( resizeRendererToDisplaySize( renderer ) ) {

			const canvas = renderer.domElement;
			camera.aspect = canvas.clientWidth / canvas.clientHeight;
			camera.updateProjectionMatrix();

		}

		mesh.position.set(
			Math.sin( time * 1.2 ) * 5,
			Math.sin( time * 1.1 ) * 5,
			Math.sin( time * 1.3 ) * 10,
		);
		xElem.textContent = mesh.position.x.toFixed( 3 );
		yElem.textContent = mesh.position.y.toFixed( 3 );
		zElem.textContent = mesh.position.z.toFixed( 3 );

		renderer.render( scene, camera );

		requestAnimationFrame( render );

	}

	requestAnimationFrame( render );

}

main();
</script>
</html>