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Code Editor : rendertargets.html

<!DOCTYPE html><html lang="fr"><head>
    <meta charset="utf-8">
    <title>Render Targets</title>
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const rtScene = new THREE.Scene();
rtScene.background = new THREE.Color('red');
</pre>
<p>Notice we set the aspect to the aspect for the render target, not the canvas.
The correct aspect to use depends on what we are rendering for. In this case
we'll use the render target's texture on the side of a cube. Since faces of
the cube are square we want an aspect of 1.0.</p>
<p>We fill the scene with stuff. In this case we're using the light and the 3 cubes <a href="responsive.html">from the previous article</a>.</p>
<pre class="prettyprint showlinemods notranslate lang-js" translate="no">{
  const color = 0xFFFFFF;
  const intensity = 1;
  const light = new THREE.DirectionalLight(color, intensity);
  light.position.set(-1, 2, 4);
*  rtScene.add(light);
}

const boxWidth = 1;
const boxHeight = 1;
const boxDepth = 1;
const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);

function makeInstance(geometry, color, x) {
  const material = new THREE.MeshPhongMaterial({color});

const cube = new THREE.Mesh(geometry, material);
*  rtScene.add(cube);

cube.position.x = x;

return cube;
}

*const rtCubes = [
  makeInstance(geometry, 0x44aa88,  0),
  makeInstance(geometry, 0x8844aa, -2),
  makeInstance(geometry, 0xaa8844,  2),
];
</pre>
<p>The <a href="/docs/#api/en/scenes/Scene"><code class="notranslate" translate="no">Scene</code></a> and <a href="/docs/#api/en/cameras/Camera"><code class="notranslate" translate="no">Camera</code></a> from the previous article are still there. We'll use them to render to the canvas.
We just need to add stuff to render.</p>
<p>Let's add a cube that uses the render target's texture.</p>
<pre class="prettyprint showlinemods notranslate lang-js" translate="no">const material = new THREE.MeshPhongMaterial({
  map: renderTarget.texture,
});
const cube = new THREE.Mesh(geometry, material);
scene.add(cube);
</pre>
<p>Now at render time first we render the render target scene to the render target.</p>
<pre class="prettyprint showlinemods notranslate lang-js" translate="no">function render(time) {
  time *= 0.001;

...

// rotate all the cubes in the render target scene
  rtCubes.forEach((cube, ndx) =&gt; {
    const speed = 1 + ndx * .1;
    const rot = time * speed;
    cube.rotation.x = rot;
    cube.rotation.y = rot;
  });

// draw render target scene to render target
  renderer.setRenderTarget(renderTarget);
  renderer.render(rtScene, rtCamera);
  renderer.setRenderTarget(null);
</pre>
<p>Then we render the scene with the single cube that is using the render target's texture to the canvas.</p>
<pre class="prettyprint showlinemods notranslate lang-js" translate="no">  // rotate the cube in the scene
  cube.rotation.x = time;
  cube.rotation.y = time * 1.1;

// render the scene to the canvas
  renderer.render(scene, camera);
</pre>
<p>And voilà</p>
<p></p><div translate="no" class="threejs_example_container notranslate">
  <div><iframe class="threejs_example notranslate" translate="no" style=" " src="/manual/examples/resources/editor.html?url=/manual/examples/render-target.html"></iframe></div>
  <a class="threejs_center" href="/manual/examples/render-target.html" target="_blank">Cliquer ici pour ouvrir dans une fenêtre séparée</a>
</div>

<p></p>
<p>The cube is red because we set the <code class="notranslate" translate="no">background</code> of the <code class="notranslate" translate="no">rtScene</code> to red so the
render target's texture is being cleared to red.</p>
<p>Render targets are used for all kinds of things. <a href="shadows.html">Shadows</a> use render targets.
<a href="picking.html">Picking can use a render target</a>. Various kinds of
<a href="post-processing.html">post processing effects</a> require render targets.
Rendering a rear view mirror in a car or a live view on a monitor inside a 3D
scene might use a render target.</p>
<p>A few notes about using <a href="/docs/#api/en/renderers/WebGLRenderTarget"><code class="notranslate" translate="no">WebGLRenderTarget</code></a>.</p>
<ul>
<li><p>By default <a href="/docs/#api/en/renderers/WebGLRenderTarget"><code class="notranslate" translate="no">WebGLRenderTarget</code></a> creates 2 textures. A color texture and a depth/stencil texture. If you don't need the depth or stencil textures you can request to not create them by passing in options. Example:</p>
<pre class="prettyprint showlinemods notranslate lang-js" translate="no">  const rt = new THREE.WebGLRenderTarget(width, height, {
    depthBuffer: false,
    stencilBuffer: false,
  });
</pre>
</li>
<li><p>You might need to change the size of a render target</p>
<p>In the example above we make a render target of a fixed size, 512x512. For things like post processing you generally need to make a render target the same size as your canvas. In our code that would mean when we change the canvas size we would also update both the render target size and the camera we're using when rendering to the render target. Example:</p>
<pre class="prettyprint showlinemods notranslate notranslate" translate="no">function render(time) {
  time *= 0.001;

if (resizeRendererToDisplaySize(renderer)) {
    const canvas = renderer.domElement;
    camera.aspect = canvas.clientWidth / canvas.clientHeight;
    camera.updateProjectionMatrix();

+    renderTarget.setSize(canvas.width, canvas.height);
+    rtCamera.aspect = camera.aspect;
+    rtCamera.updateProjectionMatrix();
}
</pre></li>
</ul>

</div>
      </div>
    </div>
  
  <script src="../resources/prettify.js"></script>
  <script src="../resources/lesson.js"></script>

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Code Editor : rendertargets.html