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What is your output resolution and CPU? 86 passes is not that much.
Some further ideas:
-revert back to default render settings
-set max sample intensity to 10 (it will make the render slightly darker, but noise will go away faster)
-place a portal as suggested
https://coronarenderer.freshdesk.com/support/solutions/articles/5000501660
It could single polygon objects applied glass material without thin option turned on. If that's the case, than you have to either add shell modifier to glass pane objects, or turn on thin option in glass material.Thanks Romullus! Thin option was issue.
Is this Corona for 3ds Max, C4D, or...?
My bet would be smoothing. I it's 3ds Max - put "smooth" modifier (not turbosmooth or meshsmooth!) on the glass geometry and do not select the "autosmooth" option.
Additionally this scene looks like it is done to showcase portals. Try two portals at the windows to speed up your rendering:
https://coronarenderer.freshdesk.com/support/solutions/articles/5000501660-how-to-use-light-portals-in-corona-
Good Luck!
Yup, adding sky is definitely useful and will help increase realism. You can play around with sun's and sky's parameters and see what you like more. Using interactive rendering can make it real fun. Do not use the "fake" lighting such as that rectangle, unless you really need it for some artistic purposes. Photographers also use mattes and reflectors to light the subject, so I guess this shouldn't be "banned". :)
For the start add corona sky to the enviroment slot, you can also do this by pressng this button in the corona sun properties.:D all right, doing it right now
And remove the plane from the ceeleng i remember that i used this method last time when i was using 3dsMAX 6 and scanline renderer.
Or you can create separate materials (different one for the paper, different for metallic letters, and whatever else you need) and nest them inside a CoronaLayere mtl using masks, but this would require daily builds. https://coronarenderer.freshdesk.com/support/solutions/articles/5000570015Thanks Maru!, i have the free version :(
You can use single material and prepare your texture in photoshop. Using layers inside PS you can separate your elements when you use them for all aspects of material, the diffuse, glossiness (shiny parts like lettering will be white, paper will be almost black), and bump for embossing (white for lifted parts) and structure.
Here is quick example I did in 1 minute in Photoshop. The first is diffuse, the second in glossiness (can be used alternatively in both specular and glossiness), and last bump map.
Or you can use the second map as bump also, if you only want the 'Rizling' embossed.
Just use Corona Material, and separate maps for diffuse and bump. If you want it more realistic, buy a bottle of wine for educational purposes (!) and see how the label is made - probably a little reflectivity and maybe a falloff map for diffuse would be nice. The rest is fun with interactive view. :)
