A quick question from someone new to compositing.
I am using the Cycles render engine. I would like to add a blur effect to an object in my scene using the compositor.
My naiive attempt at achieving this put the object in a separate render layer, and passed it through a blur node. However, I do not know how to mix the object back in to produce the composite. If I try mixing it with the other layer (containing ‘everything else’) then each layer contains the sky in it, so whatever I do the sky is affected by the compositing process.
Is there a way around this? Given that in cycles the light from the sky is a vital part of the render, the answer is not obvious to me!
Thank you in advance.