title: Three js Postprocessing
body: <p>i'm having a problem to replicate an example inside vue js.(<a href="https://threejs.org/examples/#webgl_postprocessing" rel="nofollow noreferrer">https://threejs.org/examples/#webgl_postprocessing</a>)</p>
  <p>when adding DotScreenShader or RGBShiftShader, uniforms is null.</p>
  <p><a href="https://codesandbox.io/s/infallible-mcnulty-5rk7j?file=/src/App.vue:220-248" rel="nofollow noreferrer">https://codesandbox.io/s/infallible-mcnulty-5rk7j?file=/src/App.vue:220-248</a></p>
  <p>What am I doing wrong?</p>
  <p>I try import libraries from npm (three-full, three-effectcomposer, importing like this <a href="https://threejs.org/docs/#manual/en/introduction/How-to-use-post-processing" rel="nofollow noreferrer">https://threejs.org/docs/#manual/en/introduction/How-to-use-post-processing</a>), but nothing is working.</p>