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Thank you for your quick answer. Much appreciated. Yes I can confirm you the trend in CG nowadays is to mimic a physically-based environment for our rendering.
There is an interesting interview in the asc mag about the Lion King »where Rob Legato uses this expression : "it might be mathematically correct to place the sun where it would actually be, but it’s not artistically correct."
I found this to be particularly true. In CG we care a lot (too much?) about physically correct. We do not hear "artistically correct" very often on the floor.
I have made two quick renders with :
1- an "HDRI only" makes generally our renders look flat.
2- an HDRI +Top Light help to give back some shape in a natural way.
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