我正在使用three.js并尝试创建可以存储的程序纹理，然后在会话中将其应用于对象。
理想情况下，我只想创建一次这些纹理。
我希望能够从现有资产中进行采样以创建新纹理。
在three.js示例中，显示了一个版本，其中每帧重新渲染纹理。 http://threejs.org/examples/webgl_rtt.html
我已经创建了一个我希望在此实现的示例：http://www.forsako.com/ThreeJS/RenderTest.html
不幸的是，要使这项工作，我必须每帧重新渲染纹理。
有没有办法执行此渲染，以便纹理在多个帧上持续存在，直到我告诉它被释放？我的主程序来源如下。
<html>
<head>
<title>Render Test</title>
</head>
<style>
#mycontainer {
background: #000;
width: 800px;
height: 600px;
}
</style>
<body>
<div id="mycontainer"></div>
</body>
<script src="js/three.min.js"></script>
<script src="js/TrackballControls.js"></script>
<script src="js/stats.min.js"></script>
<script src="js/PlaneGeomUV.js"></script>
<script type="text/javascript">
var Renderer, Container, Scene, Camera, Quad1, Quad2, Plane, MaterialRTT, TextureRTT, LightAmb;
var SceneRTT, CameraRTT, Q1RTT, Q2RTT, Q3RTT, Q4RTT, MaterialFromFile, TextureFromFile;
var isRenderingTex = true;
var WidthWin = 800;
var HeightWin = 640;
var WidthTile = 428;
var HeightTile = 683;
Init();
Animate();
function Init(){
var CAngle = 45;
var CAspect = WidthWin / HeightWin;
var CNearCut = 0.1;
var CFarCut = 10000;
// Set up the main rendering object and attach it to an element on the page
Renderer = new THREE.WebGLRenderer();
Renderer.setSize( WidthWin, HeightWin );
Container = document.getElementById( "mycontainer" );
Container.appendChild( Renderer.domElement );
// Set up the textures and materials for rendering
TextureFromFile = THREE.ImageUtils.loadTexture( "Assets/Map_Tiles.png" );
TextureRTT = MakeTex( Renderer, TextureFromFile, WidthTile, HeightTile );
MaterialFromFile = new THREE.MeshBasicMaterial( { color: 0xffffff, map: TextureFromFile } );
MaterialRTT = new THREE.MeshBasicMaterial( { color: 0xffffff, map: TextureRTT } );
MaterialFromFile.side = THREE.DoubleSide;
MaterialRTT.side = THREE.DoubleSide;
// Set up the main renderable scene
Scene = new THREE.Scene();
Plane = new THREE.PlaneGeometry( WidthTile, HeightTile );
Quad1 = new THREE.Mesh( Plane, MaterialFromFile );
Quad1.position.x = WidthTile*0.5;
Scene.add( Quad1 );
Quad2 = new THREE.Mesh( Plane, MaterialRTT );
Quad2.position.x = -WidthTile*0.5;
Scene.add( Quad2 );
LightAmb = new THREE.AmbientLight( 0xffffff );
Scene.add( LightAmb );
Camera = new THREE.PerspectiveCamera( CAngle, CAspect, CNearCut, CFarCut );
Camera.position.z = 1200;
Scene.add( Camera );
// Create controls using the TrackballControls library to easily manipulate our camera
Controls = new THREE.TrackballControls( Camera );
Controls.target = new THREE.Vector3( 0, 0, 0 );
Controls.rotateSpeed = 4.0;
Controls.zoomSpeed = 6.0;
Controls.panSpeed = 1.0;
Controls.noZoom = false;
Controls.noPan = false;
Controls.staticMoving = true;
Controls.dynamicDampingFactor = 0.3;
Controls.keys = [ 65, 83, 68 ];
// Add the Three.js stats object so we can track fps
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
Container.appendChild( stats.domElement );
}
function MakeTex( Renderer_in, Texture_in, Width_in, Height_in ){
var ParamsTex = { minFilter: THREE.LinearFilter, magFilter: THREE.LinearFilter, format: THREE.RGBFormat, stencilBuffer: false };
var Tex_out = new THREE.WebGLRenderTarget( WidthWin, HeightWin, ParamsTex );
var tMaterial = new THREE.MeshBasicMaterial( { color: 0xffffff, map: Texture_in } );
// Set up the scene for rendering to texture
SceneRTT = new THREE.Scene();
var tPlane = new THREE.PlaneGeometry( WidthTile*0.5, HeightTile*0.5 );
Q1RTT = new THREE.Mesh( tPlane, tMaterial );
Q1RTT.position.x = WidthTile*0.25;
Q1RTT.position.y = HeightTile*0.25;
SceneRTT.add( Q1RTT );
Q2RTT = new THREE.Mesh( tPlane, tMaterial );
Q2RTT.position.x = -WidthTile*0.25;
Q2RTT.position.y = HeightTile*0.25;
SceneRTT.add( Q2RTT );
Q3RTT = new THREE.Mesh( tPlane, tMaterial );
Q3RTT.position.x = -WidthTile*0.25;
Q3RTT.position.y = -HeightTile*0.25;
SceneRTT.add( Q3RTT );
Q4RTT = new THREE.Mesh( tPlane, tMaterial );
Q4RTT.position.x = WidthTile*0.25;
Q4RTT.position.y = -HeightTile*0.25;
SceneRTT.add( Q4RTT );
tLightAmb = new THREE.AmbientLight( 0xffffff );
SceneRTT.add( tLightAmb );
CameraRTT = new THREE.OrthographicCamera( -Width_in / 2, Width_in / 2, Height_in / 2, -Height_in / 2, 0.1, 10000 );
CameraRTT.position.z = 600;
SceneRTT.add( CameraRTT );
//Renderer.clear();
//Renderer.render( SceneRTT, CameraRTT, Tex_out, true );
return Tex_out;
}
function Animate(){
requestAnimationFrame( Animate );
Controls.update();
stats.update();
Render();
}
function Render(){
Renderer.clear();
if( isRenderingTex ){
Renderer.render( SceneRTT, CameraRTT, TextureRTT, true );
//isRenderingTex = false;
}
Renderer.render( Scene, Camera );
}
</script>
</html>