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Thanks to peoples who helped me , i managed to understand better settings and "cooking recipe" for rendering . In fact my first impressions is that it"s hard to explain but heavy contrasted scene shoud be avoided especially with only light sources and glossy materials . Some times , a very little light source, in order to reduce contrast only, in not directly reachable ray light area help a lot in terms of rendering time and fireflies . In fact i think that we shouldn't excessevely rely on light bounce and it need to be helped as subtle and often as possible .(in fact as a photographer in his studio)

So now i obtain this result . still ugly scene , but it lead me to work and work again on photorealism. (that's my purpose) .
i can already conclude that materials and texture are the next big step to improve as the lighting techniques . But not only : i'v read about post production in photoshop . what kind of postproduction ? in this exemple here after , what would you do in photoshop ? what can i seriously expect from photoshop post production ? glare ,bloom ?

Thanks in advance .

Do you have any books or Website or any ressources of any kind to recommand to me ?

thanks again

(render was done in PT )

errrm ...whats wrong with your renderings
If want PS, try adding glow, maybe bluring image a bit...

picajol wrote:errrm ...whats wrong with your renderings

there is no "wow effect" .that's the wrong thing . but i'm thinking that composition is bad , lighting also and poor texture and modelisation . also. i need to go back to the basic . Octane will give illusion of enhancement of my work but it will never suffer the comparison of people works like andrian , kubi, matty , etc ....

Good inspiration source:
http://www.ronenbekerman.com

Kind regards
Alain

just a quick try... Do you mean something like this?

YES !!!
something like that , and all other post production that bring realism and "atmosphere" ...i used to be a mechanical engineer . i need poetry , atmosphere in my rendering ...and composition...and texturing...and everything in fact....^^ .

what is the effect ?

Well there are a bunch of effects i added and changed. Mainly its color balance,white balance, shadows and highligts, some Color Aberration, some gloom.
I know how you feel i used to be a crappy civil engineer...
One more go...for more dramatic look.

Alain wrote:Good inspiration source:
http://www.ronenbekerman.com

Kind regards
Alain

thanks a lot