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RenderPasses shadow real control

ZBrush Usage Questions
#1

I’ve been testing basic renderpasses (sunLight without shadow and sunLight with shadows) in a image editor to test stuff.

The composite/shader pass have shadow information. Later in a image editor, If I add the shadow pass on top it’ll double the shadow info.
I got composite/shader from a light with shadow disabled, put the previous shadow on top and got a real control result (color info without shadow and shadow layer to control).

I’ll have to double render everything (sunLight without shadow and sunLight with shadows) everytime or there’s a shortcut to this?

#2

If you disable shadows, the resulting renders will contain no shadows. From your point of view this means that yes you will have to render certain things in multiple ways, but such is the nature of multi pass compositing. But when you render shadows, it means you can focus your rendering on ONLY the quality of those shadows, and not have to worry the quality of any of the other characteristics you captured in another pass.

#3

Interesting point of view
Thanks for your time pal, have a nice day