Aaaaaahhhh, i thought it would be checkbox in the CoronaLight (like in vray), thanks guys 
Me too, 4 minutes of panic 
don’t panic!
I could add the checkbox too.
BTW: it is implemented in a dumb way for now, so it is crucial to keep the number of polygons with portal mtl very low. That means make single plane per one window with several window tiles, it is better if some portion of the portal is obstructed, than if there is different polygon in each window segment.
one of the sexiest things in corona was.. that it didn’t need to use those damn portals
ofcourse its’s better to have this feature for better rendertimes
you STILL don’t have to use it
With portals change and lighting, interior becomes lighter. What is considered as a etalon lighting with portals or without?
that is a bug, please post the scene (if it happens with PT+PT and max sample intensity = 0)
ok, I still spend some tests and if I’m was not wrong, then I will publish the results.
I’m sorry, I was wrong
thank you Keymaster
Why is brightened with the portal?
I haven’t noticed any brightness differences so far either. Portal lowers rays/s a little but helps a lot
If you are using HDcache, then you can get random fluctuations in the brightness every time you render. Additionally, with the default setting of Max sample intensity above 0, there is some light energy clamped to remove fireflies. If you are using portals, you have less noise overall → less fireflies get clamped → image is brighter.
Could a standard coronamaterial carry a portal function? So that it would be possible to make glass panels in windows work as a portals aswell with using just a checkbox somewhere in refraction options(available when using twosided shader.)??
yes, I’ll add it in time
If you are using portals, you have less noise overall → less fireflies get clamped → image is brighter.
Keymaster, Thanks for the clarification!
Amazingly, but with portals with some of my scenes noise goes 4 times faster!
Why in the render setup, option “Portal fraction” set to 0.75 as default? Why not set to 1?