Did two test render with and without portal at 20 samples
Without Portal
With Portal
Doesn’t look that good with portal, and it darken my interior scene
Yeah strange, also the right window reflection is gone (or because of the low light).
Boost you light intensity.
Already done that, the result it still same, it’s still darker compared with no portal with the same intensity. I’m guessing because not all hole were covered with portal, like the upper section of window.
I think i will stick to non-portal one.