Hello all,
I'm working on a fairly complex residence hall in Revit 2018. I'm trying to do a sun/shading study, but I'm finding that any time I turn on shadows they are full of dots and little holes - see image below. Is there any way I can get rid of these and have a crisp shadow?
The noise pattern looks like it is echoing a floor plan or some other geometry .
-Do you have any Cad inserted in the file? If so, try turning it off.
-Or, is there a level below grade?
-Any plaza/paving/toposurface/subregions?
-Any point clouds in the project?
-Try turning off hardware acceleration under Options>Graphics
Hmmm....
-Try updating your graphics card driver. (sometimes you actually may have too new a driver and a rollback is required for Revit to work properly.)
-Make sure to install the latest Update Release for Revit, and if working in a team setting that all users are on the exact same build of Revit.
-Any large raster images inserted
-Cad is off, but sometimes if a cad file's origin is more than 20 miles away from Revit's origin, odd graphics can happen.
See if you can open the Cad file(s) and move their origins to a known location ( like a corner of your building.)
The thread is a year old... the last real info was graphics card related. My money is on the graphics card and/or lighting settings no defining the base level. I've seen many graphics card issues over the years...this looks no different to me.
Steve Stafford
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Hi @SteveKStafford,
Being a lighting nerd and making a lot of complex buildings, I like to use shadows a lot. I`ve had consistent issues with Revit over the last years with shadows in complex buildings.
My graphic drivers are up to date. I use a 1080 at work and a 2080 at home. I see these artifacts all the time, so much that I've given up on using shadows in Revit. Mind you, it comes mostly on large complex buildings.
If you have a particular driver you'd like me to try, I can go ahead. By seeing this issue over two years on probably over 10 different drivers, I think this is simply a Revit limitation: Revit shadows are broken.
This is not a lighting setting issue, this happens on all lighting settings.
Okay, Revit's shadow casting code might need a fresh look. Since I started using Revit 1.0 they've gone through three separate rendering engine developments. I have no idea how that's impacted the code for shadows in regular model views as compared with rendering. I'm sure it must have been revisited in some fashion because of the changes to provide Realistic and Consistent Color options.
There are many variables, as you know. Graphics card and drivers have been a consistent difficult issue for Revit development. There is considerable latitude that developers have for graphic card/driver standards. As such they attempt to let a user know when their card/driver is not among those they have tested against. The model elements and how a model is assembled can contribute to the issue as well as the dozens of subtle settings related to generating shadows. Experimenting with adjusting values might produce a better result, or at least one that is closer to acceptable.
Steve Stafford
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