Post-processing to selected meshes

Question

In three.js is it possible to apply postprocessing effects only to selected meshes?

For example to have a cube with grain effect while the rest of the scene does not have it. Thank you!

Answer 1

Yes. There is a three.js example that shows how to apply postprocessing to selected meshes using masking.

I think that example can be improved for clarity, but you can modify the example like so:

composer4 = new THREE.EffectComposer( renderer, new THREE.WebGLRenderTarget( rtWidth, rtHeight, rtParameters ) );

composer4.addPass( renderScene );
composer4.addPass( renderMask );
composer4.addPass( effectDotScreen );
composer4.addPass( clearMask );
composer4.addPass( effectVignette );

You will get an output like this:

It is a complicated example, so you will have to study it carefully.

three.js.r.77

Answer 2

Yes, if you put your object to another scene. But you will face a problem with dept rendering, some object will be always on top. It depends on situation of your scene.