Reusing tDiffuse from render target in multi-composer pipeline

Questions
,
1

Hi,

I have a multi-composer pipeline of the form:

      const renderScene = new RenderPass(scene, camera);
      const offscreenTarget = new WebGLRenderTarget(size.width, size.height);

      const comp = new EffectComposer(gl, offscreenTarget);
      comp.renderToScreen = false;
      comp.addPass(renderScene);

      const finalComposer = new EffectComposer(gl);
      const radialBlurShader = new RadialBlurShader();
      radialBlurShader.uniforms.strength.value = 0.08;
      const radialPass = new ShaderPass(radialBlurShader);
      const finalPass = new ShaderPass(new GaussianBlurShader());
      finalPass.needsSwap = true;
      finalComposer.addPass(renderScene);
      finalComposer.addPass(radialPass);
      finalComposer.addPass(finalPass);

The approach is similar to what’s described in:
http://bkcore.com/blog/3d/webgl-three-js-animated-selective-glow.html

Notice that the renderScene pass runs once in each pipeline. But I don’t want to run the renderScene pass twice. Is there a way to retrieve the render from the first composer (comp), extract the texture from the render target, and feed that into the tDiffuse of subsequent effects?