<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - materials - wireframe</title>
<meta charset="utf-8">
<style>
body {
margin: 0px;
background-color: #000000;
overflow: hidden;
}
</style>
</head>
<body>
<script src="../build/three.min.js"></script>
<script type="x-shader/x-vertex" id="vertexShader">
attribute vec3 center;
varying vec3 vCenter;
void main() {
vCenter = center;
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
}
</script>
<script type="x-shader/x-fragment" id="fragmentShader">
#extension GL_OES_standard_derivatives : enable
varying vec3 vCenter;
float edgeFactorTri() {
vec3 d = fwidth( vCenter.xyz );
vec3 a3 = smoothstep( vec3( 0.0 ), d * 1.5, vCenter.xyz );
return min( min( a3.x, a3.y ), a3.z );
}
void main() {
gl_FragColor.rgb = mix( vec3( 1.0 ), vec3( 0.2 ), edgeFactorTri() );
gl_FragColor.a = 1.0;
}
</script>
<script>
var camera, scene, renderer;
var meshTris, meshLines, meshMixed;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 2000 );
camera.position.z = 800;
scene = new THREE.Scene();
var size = 150;
var geometryLines = new THREE.BoxGeometry( size, size, size );
var geometryTris = new THREE.BoxGeometry( size, size, size );
// wireframe using gl.LINES
var materialLines = new THREE.MeshBasicMaterial( { wireframe: true } );
meshLines = new THREE.Mesh( geometryLines, materialLines );
meshLines.position.x = -150;
scene.add( meshLines );
//
var vertexShader = document.getElementById( 'vertexShader' ).textContent;
var fragmentShader = document.getElementById( 'fragmentShader' ).textContent;
// wireframe using gl.TRIANGLES (interpreted as triangles)
var attributesTris = { center: { type: 'v3', boundTo: 'faceVertices', value: [] } };
var valuesTris = attributesTris.center.value;
setupAttributes( geometryTris, valuesTris );
var materialTris = new THREE.ShaderMaterial( { uniforms: {}, attributes: attributesTris, vertexShader: vertexShader, fragmentShader: fragmentShader } );
meshTris = new THREE.Mesh( geometryTris, materialTris );
meshTris.position.x = 150;
scene.add( meshTris );
// wireframe using gl.TRIANGLES (mixed triangles and quads)
var mixedGeometry = new THREE.SphereGeometry( size / 2, 32, 16 );
var attributesMixed = { center: { type: 'v3', boundTo: 'faceVertices', value: [] } };
var valuesMixed = attributesMixed.center.value;
setupAttributes( mixedGeometry, valuesMixed );
var materialMixed = new THREE.ShaderMaterial( { uniforms: {}, attributes: attributesMixed, vertexShader: vertexShader, fragmentShader: fragmentShader } );
meshMixed = new THREE.Mesh( mixedGeometry, materialMixed );
meshMixed.position.x = -150;
scene.add( meshMixed );
// renderer
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );
// events
window.addEventListener( 'resize', onWindowResize, false );
}
function setupAttributes( geometry, values ) {
for( var f = 0; f < geometry.faces.length; f ++ ) {
values[ f ] = [ new THREE.Vector3( 1, 0, 0 ), new THREE.Vector3( 0, 1, 0 ), new THREE.Vector3( 0, 0, 1 ) ];
}
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
meshLines.rotation.x += 0.005;
meshLines.rotation.y += 0.01;
meshTris.rotation.x += 0.005;
meshTris.rotation.y += 0.01;
if ( meshMixed ) {
meshMixed.rotation.x += 0.005;
meshMixed.rotation.y += 0.01;
}
renderer.render( scene, camera );
}
</script>
</body>
</html>