Have been working on a building in Revit 2011 and have been rendering with sunlight only. Rendering was working perfectly fine until I made some major changes. Installed many downlights and wall washers, along with some material changes. Suddenly the interior rendering is not working. It pixilates, but all I get is a black screen. Have tried many different variations and permutations of settings, including turning off all the lights, but cannot render. However, the exterior rendering still works, but windows are too reflective.
I went back to an earlier version of the model and it still works. Also, I opened the file on another computer at a design school and results were the same, so it is something in the file, not the computer.
Has anyone else had this problem? Did I accidentally make a mistake somewhere in the settings?
This sounds like a lack of memory problem.
Artificial lights drastically affect the calculations and amount of both CPU and RAM required.
What are your OS and computer specs? If you are running 32 bit windows with only 4GB of RAM, you will not have much luck rendering complex interior scenes with lots of artificial lights.
Sun only requires much less computer resources, which is why the daytime scenes will render alot faster.
Another good tip:
Try using a Section Box to "clip" the scene so it renders only objects visible to the camera.
Thanks for your overview. This is pretty much what I was thinking, however it previously rendered with sun only and now will not render with sun only. I have tried doing sun only with all the lights turned off. I am a relatively new Revit user and am wondering --- would Revit still calculate using lights even when the lights are turned off? I guess I should test this by deleting all the lights, rather than turning them off.
Also, as I mentioned, I tried this render in the computer lab at an interior design school, which I assume has a pretty powerful computer, although I didn't bother to check the stats on it. Will post the results of deleting the lights.
Well, I'm somewhat embarrassed to admit I did do something accidental that really messed things up. I puzzled and puzzled, but the clue was that the exterior renderings still worked, albeit strangely, because the glass was too reflective. I then remembered that I had been experimenting (I'm relatively new to Revit) with making a mirrored wall. When I explored further, it turns out that I had accidentally changed ALL the system glass panels (windows, doors, storefronts) to mirror! That's why the interiors were black. No sun was getting in. When I switched that back again, things were back to normal. But what I discovered was that I needed to tinker quite a bit with the artificial lights to get them to the intensity I wanted. Had to make a lot of changes, both to the lamps and the glass (in sconces.)
I will try your section box idea ... sounds like a good one, although haven't had a chance to do it yet. The 32 bit system has to do for now, although am hoping to get something better in the after-Christmas sales (ho-ho-ho!)
Thanks so much for your help!
For those following this thread . . . .
I had a similar problem with black perspective (i.e. camera) views, but for a different reason.
The pen weight for perspective line weights was set to 1000mm (a slipped decimal point!).
So whenever I went into, or printed, a perspective the 1 metre wide pens made everything black.
I am using Revits 2014. My computer has 32G RAM and my OS is 64bit. I am using the camara to view a room it is blacked out after rendering. is there anything else it could be besides lack of RAM?
If you can see the lights on in the rendering, but everything else is dark (?), then it looks like you need to use more and/or higher wattage lights. How large is the room and which lights are you using?