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.
65 lines
2.0 KiB
65 lines
2.0 KiB
3 years ago
|
<!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<meta charset="utf-8">
|
||
|
|
<base href="../../../" />
|
||
|
|
<script src="page.js"></script>
|
||
|
|
<link type="text/css" rel="stylesheet" href="page.css" />
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<h1>[name]</h1>
|
||
|
|
<div>
|
||
|
|
<p>
|
||
|
|
Let's say you want to draw a line or a circle, not a wireframe [page:Mesh].
|
||
|
|
First we need to set up the [page:WebGLRenderer renderer], [page:Scene scene] and camera (see the Creating a scene page).
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p>Here is the code that we will use:</p>
|
||
|
|
<code>
|
||
|
|
const renderer = new THREE.WebGLRenderer();
|
||
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
||
|
|
document.body.appendChild( renderer.domElement );
|
||
|
|
|
||
|
|
const camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 500 );
|
||
|
|
camera.position.set( 0, 0, 100 );
|
||
|
|
camera.lookAt( 0, 0, 0 );
|
||
|
|
|
||
|
|
const scene = new THREE.Scene();
|
||
|
|
</code>
|
||
|
|
<p>Next thing we will do is define a material. For lines we have to use [page:LineBasicMaterial] or [page:LineDashedMaterial].</p>
|
||
|
|
<code>
|
||
|
|
//create a blue LineBasicMaterial
|
||
|
|
const material = new THREE.LineBasicMaterial( { color: 0x0000ff } );
|
||
|
|
</code>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
After material we will need a geometry with some vertices:
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<code>
|
||
|
|
const points = [];
|
||
|
|
points.push( new THREE.Vector3( - 10, 0, 0 ) );
|
||
|
|
points.push( new THREE.Vector3( 0, 10, 0 ) );
|
||
|
|
points.push( new THREE.Vector3( 10, 0, 0 ) );
|
||
|
|
|
||
|
|
const geometry = new THREE.BufferGeometry().setFromPoints( points );
|
||
|
|
</code>
|
||
|
|
|
||
|
|
<p>Note that lines are drawn between each consecutive pair of vertices, but not between the first and last (the line is not closed.)</p>
|
||
|
|
|
||
|
|
<p>Now that we have points for two lines and a material, we can put them together to form a line.</p>
|
||
|
|
<code>
|
||
|
|
const line = new THREE.Line( geometry, material );
|
||
|
|
</code>
|
||
|
|
<p>All that's left is to add it to the scene and call [page:WebGLRenderer.render render].</p>
|
||
|
|
|
||
|
|
<code>
|
||
|
|
scene.add( line );
|
||
|
|
renderer.render( scene, camera );
|
||
|
|
</code>
|
||
|
|
|
||
|
|
<p>You should now be seeing an arrow pointing upwards, made from two blue lines.</p>
|
||
|
|
</div>
|
||
|
|
</body>
|
||
|
|
</html>
|