> If all of the complex manipulations seen here are really done with 
> layers... hmm, it must take quite a bit of planning to make sure 
> everything is in the correct layer and not accidentally paint yourself 
> into a corner.

Humans can make mistakes, sure.

http://cad-comic.com/comic.php?d=20080216
http://www.cad-forums.com/showpost.php?p=2554424&postcount=31

>>> - How the heck does he do that thing with the floorboards? And the 
>>> shading for the shadow in the doorway? I've never seen anything so 
>>> advanced, ever!
>>
>>   Layers, transparency.
> 
> Well, sure - but how does he make the shadow edges soft? That must 
> involve some pretty special shading technology. Most software I've seen 
> will do simple linear colour gradients, but not complex shadow outlines 
> like that.

If the shadow is on its own layer, you could blur it when you're done :)

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