重绘对象时如何清屏?
How can I clear the screen when I redraw an object?
我正在尝试实施 boids 算法,一切都很顺利,直到使用 three.js 绘制小鸟(或立方体,在我的例子中)。
重绘后屏幕没有清空,所以我什至在屏幕上看到了旧的立方体。
这是我的代码:
var scene;
var camera;
var aspect = window.innerWidth / window.innerHeight;
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45, aspect, 0.1, 1000 );
camera.position.z = 200;
var geometry = new THREE.BoxGeometry( 10, 10, 10 );
var loader = new THREE.TextureLoader();
function init()
{
var posx, posy, posz;
var velx, vely, velz;
var rotx = 0;
var roty = 0;
var rotz = 0;
var boid;
loader.load('images/picture.jpg', function ( texture ) {
var material = new THREE.MeshBasicMaterial( {
map: texture
} );
for ( var i = 0; i < 5; i ++ ) {
posx = (Math.random() - 0.5) * 100;
posy = (Math.random() - 0.5) * 100;
posz = (Math.random() - 0.5) * 100;
velx = (Math.random() - 0.7) * 100;
vely = (Math.random() - 0.7) * 100;
velz = (Math.random() - 0.7) * 100;
var boidPosition = new THREE.Vector3(posx, posy, posz);
var boidRotation = new THREE.Vector3(rotx, roty, rotz);
var boidVelocity = new THREE.Vector3(velx, vely, velz);
var boidDesign = new THREE.Mesh( geometry, material );
boidDesign.position.x = boidPosition.x;
boidDesign.position.y = boidPosition.y;
boidDesign.position.z = boidPosition.z;
boid = new Boid(boidPosition, boidVelocity);
boids[i] = boid;
boidDesign.name = "test_name" + i;
scene.add( boidDesign );
}
},
function ( xhr ) {
console.log( (xhr.loaded / xhr.total * 100) + '% loaded' );
},
function ( xhr ) {
console.log( 'An error happened' );
}
);
}
function redraw() {
var boid;
loader.load('images/picture.jpg', function ( texture ) {
var material = new THREE.MeshBasicMaterial( {
map: texture
} );
for ( var i = 0; i < boids.length; i ++ ) {
boid = boids[i];
var boidPosition = new THREE.Vector3(boid.position.x, boid.position.y, boid.position.z);
var boidDesign = new THREE.Mesh( geometry, material );
boidDesign.position.x = boidPosition.x;
boidDesign.position.y = boidPosition.y;
boidDesign.position.z = boidPosition.z;
boidDesign.name = "test_name" + i;
scene.add( boidDesign );
}
},
function ( xhr ) {
console.log( (xhr.loaded / xhr.total * 100) + '% loaded' );
},
function ( xhr ) {
console.log( 'An error happened' );
}
);
}
function removeEntity(object) {
var selectedObject = scene.getObjectByName(object.name);
scene.remove( selectedObject );
}
function drawAfterUpdate()
{
var boid;
for(var i = 0; i < boids.length; i++)
{
boid = boids[i];
boid.update(boids);
removeEntity(boid);
}
redraw(boids);
}
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( 0x000000 );
document.body.appendChild( renderer.domElement );
var render = function()
{
requestAnimationFrame( render );
drawAfterUpdate();
renderer.render( scene, camera );
};
init();
render();
我就是找不到解决办法。
如果需要更多详细信息,请询问。
提前致谢。 :)
所以,我找到了一个解决方案:我删除了重绘和初始化中的 loader.load 调用,并在这些函数之外定义了纹理和 material 结果是一样的,但它似乎加载得更快在页面上。另外,我没有删除我认为的对象,所以我更改了这个:boidDesign.name = "boid"+i;
和这个:boid.name = "boid" + i; boidDesign.name = boid.name;
并且它按预期工作。
我正在尝试实施 boids 算法,一切都很顺利,直到使用 three.js 绘制小鸟(或立方体,在我的例子中)。
重绘后屏幕没有清空,所以我什至在屏幕上看到了旧的立方体。
这是我的代码:
var scene;
var camera;
var aspect = window.innerWidth / window.innerHeight;
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45, aspect, 0.1, 1000 );
camera.position.z = 200;
var geometry = new THREE.BoxGeometry( 10, 10, 10 );
var loader = new THREE.TextureLoader();
function init()
{
var posx, posy, posz;
var velx, vely, velz;
var rotx = 0;
var roty = 0;
var rotz = 0;
var boid;
loader.load('images/picture.jpg', function ( texture ) {
var material = new THREE.MeshBasicMaterial( {
map: texture
} );
for ( var i = 0; i < 5; i ++ ) {
posx = (Math.random() - 0.5) * 100;
posy = (Math.random() - 0.5) * 100;
posz = (Math.random() - 0.5) * 100;
velx = (Math.random() - 0.7) * 100;
vely = (Math.random() - 0.7) * 100;
velz = (Math.random() - 0.7) * 100;
var boidPosition = new THREE.Vector3(posx, posy, posz);
var boidRotation = new THREE.Vector3(rotx, roty, rotz);
var boidVelocity = new THREE.Vector3(velx, vely, velz);
var boidDesign = new THREE.Mesh( geometry, material );
boidDesign.position.x = boidPosition.x;
boidDesign.position.y = boidPosition.y;
boidDesign.position.z = boidPosition.z;
boid = new Boid(boidPosition, boidVelocity);
boids[i] = boid;
boidDesign.name = "test_name" + i;
scene.add( boidDesign );
}
},
function ( xhr ) {
console.log( (xhr.loaded / xhr.total * 100) + '% loaded' );
},
function ( xhr ) {
console.log( 'An error happened' );
}
);
}
function redraw() {
var boid;
loader.load('images/picture.jpg', function ( texture ) {
var material = new THREE.MeshBasicMaterial( {
map: texture
} );
for ( var i = 0; i < boids.length; i ++ ) {
boid = boids[i];
var boidPosition = new THREE.Vector3(boid.position.x, boid.position.y, boid.position.z);
var boidDesign = new THREE.Mesh( geometry, material );
boidDesign.position.x = boidPosition.x;
boidDesign.position.y = boidPosition.y;
boidDesign.position.z = boidPosition.z;
boidDesign.name = "test_name" + i;
scene.add( boidDesign );
}
},
function ( xhr ) {
console.log( (xhr.loaded / xhr.total * 100) + '% loaded' );
},
function ( xhr ) {
console.log( 'An error happened' );
}
);
}
function removeEntity(object) {
var selectedObject = scene.getObjectByName(object.name);
scene.remove( selectedObject );
}
function drawAfterUpdate()
{
var boid;
for(var i = 0; i < boids.length; i++)
{
boid = boids[i];
boid.update(boids);
removeEntity(boid);
}
redraw(boids);
}
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( 0x000000 );
document.body.appendChild( renderer.domElement );
var render = function()
{
requestAnimationFrame( render );
drawAfterUpdate();
renderer.render( scene, camera );
};
init();
render();
我就是找不到解决办法。
如果需要更多详细信息,请询问。 提前致谢。 :)
所以,我找到了一个解决方案:我删除了重绘和初始化中的 loader.load 调用,并在这些函数之外定义了纹理和 material 结果是一样的,但它似乎加载得更快在页面上。另外,我没有删除我认为的对象,所以我更改了这个:boidDesign.name = "boid"+i;
和这个:boid.name = "boid" + i; boidDesign.name = boid.name;
并且它按预期工作。