I'd like to toss in my view about why use the difrent passes on a render even so seamingly simple. Time.. even if it takes the same amount of time to render each pas as say doing it all at once. You will save time in the end and have far more controle. Becouse with photoshop or other post app, you can controle in real time how each aspect of the image interacts.. To much light ? just tern down the layer thats on.. you don't have to render again.. and take a guess at the value to put the lights at.. you don't have to do a render and realise its to dark, its under satruated, its to soft from the occlution or not enough. and so on.. you just mix thoughs in post. So you don't have to tweek a little and then hit the render and hope like hell it comes out alright.. You have extream controle like that also.


Think I got a little repetive there ?