【发布时间】：2016-04-13 21:38:41
【问题描述】：
我正在使用 Three.js 和 ImprovementNoise.js 创建一个 3D 地形。使用 Three.js 网站上的示例，我设法创建了看似地形但它是 2D 的（未扩展到 z 轴）。
在尝试创建此场景时，我在示例代码中遇到了错误。我必须稍微改变一些东西才能让它工作，例如：
geometry.rotateX(-Math.PI)
我改成
geometry.rotateX = -Math.PI
但引发错误的一件事是 THREE.CanvasTexture 不是函数。 CanvasTexture 出现在我能找到的每三个.js 示例中，但我找不到任何关于它被更改的文档。但是，CanvasTexture 不在 three.js 网站上的文档中，所以我假设它已被弃用。
无论如何，我现在的问题是，虽然我还没有弄清楚我的问题，但我尝试逐字复制和粘贴示例代码，以便我可以向后工作以尝试更好地理解代码，但即使是来自three.js 网站在我的计算机上运行时会显示为 2D。
以下是示例代码（稍作改动以避免上述错误）：
如果有人能告诉我这是否适合他们或我缺少什么，将不胜感激。
谢谢
我正在使用这些库：
<script src="js/three.min.js"></script>
<script src="js/PointerLockControls.js"></script>
<script src="js/OrbitControls.js"></script>
<script src="js/ImprovedNoise.js"></script>
<script src="js/FirstPersonControls.js"></script>
<script src="js/Detector.js"></script>
这里是js： （我唯一改变的另一件事是我没有包含 stats 库，所以下面将相应的代码注释掉）
var container, stats;
var camera, controls, scene, renderer;
var mesh, texture;
var worldWidth = 256, worldDepth = 256,
worldHalfWidth = worldWidth / 2, worldHalfDepth = worldDepth / 2;
var clock = new THREE.Clock();
var helper;
var raycaster = new THREE.Raycaster();
var mouse = new THREE.Vector2();
init();
animate();
function init() {
container = document.getElementById( 'blocker' );
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 1, 20000 );
scene = new THREE.Scene();
controls = new THREE.OrbitControls(camera);
controls.center.set( 0.0, 100.0, 0.0 );
controls.userPanSpeed = 100;
data = generateHeight( worldWidth, worldDepth );
controls.center.y = data[ worldHalfWidth + worldHalfDepth * worldWidth ] + 500;
camera.position.y = controls.center.y + 2000;
camera.position.x = 2000;
var geometry = new THREE.PlaneBufferGeometry( 7500, 7500, worldWidth - 1, worldDepth - 1 );
geometry.rotateX = - Math.PI / 2 ;
var vertices = geometry.attributes.position.array;
for ( var i = 0, j = 0, l = vertices.length; i < l; i ++, j += 3 ) {
vertices[ j + 1 ] = data[ i ] * 10;
}
geometry.computeFaceNormals();
texture = new THREE.Texture( generateTexture( data, worldWidth, worldDepth ) );
texture.wrapS = THREE.ClampToEdgeWrapping;
texture.wrapT = THREE.ClampToEdgeWrapping;
mesh = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { map: texture } ) );
scene.add( mesh );
var geometry = new THREE.CylinderGeometry( 0, 20, 100, 3 );
geometry.translate = 0, 50, 0 ;
geometry.rotateX = Math.PI / 2 ;
helper = new THREE.Mesh( geometry, new THREE.MeshNormalMaterial() );
scene.add( helper );
renderer = new THREE.WebGLRenderer();
renderer.setClearColor( 0xbfd1e5 );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.innerHTML = "";
container.appendChild( renderer.domElement );
container.addEventListener( 'mousemove', onMouseMove, false );
//stats = new Stats();
//stats.domElement.style.position = 'absolute';
//stats.domElement.style.top = '0px';
//container.appendChild( stats.domElement );
//
window.addEventListener( 'resize', onWindowResize, false );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function generateHeight( width, height ) {
var size = width * height, data = new Uint8Array( size ),
perlin = new ImprovedNoise(), quality = 1, z = Math.random() * 100;
for ( var j = 0; j < 4; j ++ ) {
for ( var i = 0; i < size; i ++ ) {
var x = i % width, y = ~~ ( i / width );
data[ i ] += Math.abs( perlin.noise( x / quality, y / quality, z ) * quality * 1.75 );
}
quality *= 5;
}
return data;
}
function generateTexture( data, width, height ) {
var canvas, canvasScaled, context, image, imageData,
level, diff, vector3, sun, shade;
vector3 = new THREE.Vector3( 0, 0, 0 );
sun = new THREE.Vector3( 1, 1, 1 );
sun.normalize();
canvas = document.createElement( 'canvas' );
canvas.width = width;
canvas.height = height;
context = canvas.getContext( '2d' );
context.fillStyle = '#000';
context.fillRect( 0, 0, width, height );
image = context.getImageData( 0, 0, canvas.width, canvas.height );
imageData = image.data;
for ( var i = 0, j = 0, l = imageData.length; i < l; i += 4, j ++ ) {
vector3.x = data[ j - 2 ] - data[ j + 2 ];
vector3.y = 2;
vector3.z = data[ j - width * 2 ] - data[ j + width * 2 ];
vector3.normalize();
shade = vector3.dot( sun );
imageData[ i ] = ( 96 + shade * 128 ) * ( 0.5 + data[ j ] * 0.007 );
imageData[ i + 1 ] = ( 32 + shade * 96 ) * ( 0.5 + data[ j ] * 0.007 );
imageData[ i + 2 ] = ( shade * 96 ) * ( 0.5 + data[ j ] * 0.007 );
}
context.putImageData( image, 0, 0 );
// Scaled 4x
canvasScaled = document.createElement( 'canvas' );
canvasScaled.width = width * 4;
canvasScaled.height = height * 4;
context = canvasScaled.getContext( '2d' );
context.scale( 4, 4 );
context.drawImage( canvas, 0, 0 );
image = context.getImageData( 0, 0, canvasScaled.width, canvasScaled.height );
imageData = image.data;
for ( var i = 0, l = imageData.length; i < l; i += 4 ) {
var v = ~~ ( Math.random() * 5 );
imageData[ i ] += v;
imageData[ i + 1 ] += v;
imageData[ i + 2 ] += v;
}
context.putImageData( image, 0, 0 );
return canvasScaled;
}
//
function animate() {
requestAnimationFrame( animate );
render();
//stats.update();
}
function render() {
controls.update( clock.getDelta() );
renderer.render( scene, camera );
}
function onMouseMove( event ) {
mouse.x = ( event.clientX / renderer.domElement.clientWidth ) * 2 - 1;
mouse.y = - ( event.clientY / renderer.domElement.clientHeight ) * 2 + 1;
raycaster.setFromCamera( mouse, camera );
// See if the ray from the camera into the world hits one of our meshes
var intersects = raycaster.intersectObject( mesh );
// Toggle rotation bool for meshes that we clicked
if ( intersects.length > 0 ) {
helper.position.set( 0, 0, 0 );
helper.lookAt( intersects[ 0 ].face.normal );
helper.position.copy( intersects[ 0 ].point );
}
}
【问题讨论】：
标签： javascript 3d three.js terrain perlin-noise