Hello, my question is do i need portals for better interior lighting, and do they help reduce render time, how proper way to set up it, i was googling about it, and found various answers, they are dont needed or they are for better quality, so what is the truth, or it dipends on interior situation?
I’ve been doing some experiments with recent versions of V-Ray and portals didn’t really seem to help that much anymore. I would generally stay clear of them. We will also work to improve V-Ray’s sampling so that there is even less need for portals in the future.
Best regards,
Vlado
@vlado When do you think the improvements in the sampling will be at the point where the portals are not needed? The most recent tests I did (maybe about a month ago now, using Vray 3.5) still shows that for a room with a small proportion of daylight openings, using portals still gives a big advantage (almost 2x faster at the same noise threshold.)
I have no idea yet, it’s still research, but it would be clearer in a month or so.
Best regards,
Vlado
I stopped using them the first time Vlado mentioned that they were no longer needed, which had to me 6+ months ago, and I don’t miss them.
I just ran a comparison of my testing model that I last rendered in May. I’m using a month-old Vray 3.5 build. The only difference between the renders is that I turned off the portal lights in the windows. I can test with the latest Vray, but it sounds like there hasn’t been that much of a change in the engine since a month ago.
andybot did you use simple portals, or portals, and where you placed it inside toom or outside room if i can ask?
Simple portals with sky environment. I’ll do a test with hemi light as well.
Any render time hits? Is it worth the effort to add the lights if you can brighten things up in post production? Side by side you can see the difference, but it’s hard to say which one is ‘correct’.
Yes, almost double time difference (the render times are in the stamp at the bottom). Seems it’s only the case for env. lighting. With a dome light it’s about equal with or without portals. Yes, the lighting is not identical, seems that could be adjusted by tweaking the exposure.
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Jazzmanny first of all i noticed that your top (ceyling lights) too strong, now all bright parts of image are burned out, brown furniture glossines value are too high if you trying to get really close image result like in reference, try to lower i guess below0.85, dont know. your broun furniture hight is too high, in this case you loose shadows in that gap, can you show your light setup in the scene, becaus it looks not identical for reference, I is obvious when you look in the shadows directions and spreading area on the floor
Well that photo you have above me is the reference scene from a website. The photo on the left is what i have made so far. The issue is the lighting i am trying to figure that out.
I see, my bad. It might help to start with one light and work around your scene. I usually start with the main light and add other lights, one at a time and I adjust them until they work for me.
Yeah, that what i am trying to do, the issue with blender is even though i have GPU it won’t render or get a error after starting up after awhile, something about not enough ram, but so i have to use my cpu that was made in 2011 i need a new one.