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Forums >> Revit Building >> Technical Support >> Can you limit Daylight Portals?

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Fri, May 14, 2010 at 7:45:17 PM | Can you limit Daylight Portals?

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arusso5


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I am working on an interior rendering for a school project and I created a lighting group so that only the lights that I want in the rendering are on (30 total fixtures).  I made a custom rendering setting Cryingafter reading a number of post on Revitcity) and changed the setting to medium with a higher anti-aliasing, turned on daylight portals, but i noticed that when I started the rendering that Revit thinks there are 30 artificial lights and 384 daylight portals.  In my estimation between windows and doors there are maybe 15 portals that affect this rendering.

My question is, is there a way to limit the daylight portals that Revit is calculating in any given rendering?  This rendering is 4 hours into it and only 85% finished.  I'm running Windows 7 (x64), Revit 2010 (x64), 8 GB ram on an HP Elitebook 8730w.  I think the calculating of all the daylight portals is what is taking so long.

Is there a way to change this?

Thanks in advance.


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Sat, May 15, 2010 at 12:45:53 AM | Can you limit Daylight Portals?

#2

alabaster2513


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You need to turn on the section box for this camera view and go to another view and size it so you camera is only trying to render the geometry within the section box.

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Mon, May 17, 2010 at 4:14:01 PM | Can you limit Daylight Portals?

#3

arusso5


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Alabaster,

Thanks for the direction on the section box for the view, I hadn't realized that there was such an animal.  Even when I adjusted the scope of the section box though when I set the rendering to go, it still shows 30 artificial lights and 382 daylight portals.  Is Revit trying to render through all 382 portals, even though most of them are outside of the section box?

I've been reading a lot about trying to speed up the rendering process.  My CPU's are pegged at 100% during the rendering and I'm utilizing 5.25 GB of Ram... The machine seems to be running pretty smooth, but with the daylight portals off and the artificial lights on it has still taken 01 hour 12 minutes (and counting) at 75% of the rendering.  The image is only 8" x 5" at 150 dpi.  Not sure why this machine isn't just tearing through it...

Any other ideas?  Thanks again.


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Mon, May 17, 2010 at 4:28:58 PM | Can you limit Daylight Portals?

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arusso5


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This thought just popped into my head... do I need to leave the section box on when I render?  Would this limit what Revit decides to render?  I set the section box, but then I turned it off.  Should I have?

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Mon, May 17, 2010 at 6:50:07 PM | Can you limit Daylight Portals?

#5

alabaster2513


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yes definetely leave the section box on. the one thing you need to watch out for is exposing a hallway or opening to direct sun by creating the section box. Usually if i have that condition i use a temporary mass to fill the void.

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