Background: Revit 2017 project includes revit elements (walls, floors, windows, doors, revit drape families, revit table and chair family. It also includes a linked DWG cad file that contains solids with materials applied. CAD Materials include clear glass, metallic, stone, and plastic laminate. On one camera view, the imported elements look great. On the camera view I added from another point of view this morning, the same elements look horrible. Anyone got any ideas?
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I'd guess that the normals are not right?
Have you checked the imported material in the material library as well?
François
Francois-Gabriel Perraudin
BIM management and coaching
Thanks François,
Unfortunately, there is no way to check the normals in Revit. There is no UVW mapping either. There is no Revit file auditing mechanism. For this file, one camera continues to render suitably. Even a copy of that camera, however, renders like this regardless of camera direction or field of view.
The materials were pretty much right out of the AutoCAD material library. The AutoCAD is linked, not imported. AutoCAD components (cabinets and counters) were placed, unpinned, moved and rotated to coordinate with the plan. The draperies were a windows family I created. I didn't bring anything back from 3dsMax. I did try to use Revit’s material features to add a cutout to the drapery material because light that was coming through the windows was completely blocked by the draperies even though at one point I had transparency cranked to 100%. Even though light was coming in through the windows, I found out later, after much experimenting, that the reason light was not going through draperies was that I was using the exterior lighting mode rather than the interior lighting mode. At that point, I removed the cutouts and reduced the transparency for that material.
Before I linked AutoCAD, I tried exporting the solids and then importing them as an ASCIS file. The problem with that method is that materials don't make the trip and the ASCIS solids can't be manipulated in Revit. Even applying materials to ASCIS surfaces is impossible.
I did add some downlights, late in the game, that were inside the cabinet. Those lights never seemed to illuminate the cabinet. I just didn’t have time to debug Revit so I ended up canning the Revit implementation and went back to AutoCAD and then to AutoCAD Architecture. The rendering times are much faster and rendering quality in AutoCAD Architecture is so much better that I don’t see going back to Revit 2017.
The high quality Revit rendering settings seems grainier than the draft version. I am not sure whether this is sourced in the materials, the exposure, or the number of artificial lights.
PS: I suspect, but cannot prove, that most of the problems are due to the fact that materials are often related to the rendering engines that they are related to. Since Revit 2017 dropped Mental Ray, interoperability between other AutoDesk software that retains the Mental Ray engine and many legacy materials make sharing data between Autodesk applications entirely unsuitable. There needs to be some serious attempt at coordination between product teams when these decisions are made in order to handle material data information properly.
When you say "Even a copy of that camera, however, renders like this regardless of camera direction or field of view." I'm not clear how you are creating the copy.
Are you right clicking on the existing Camera View and selecting Duplicate View -> Duplicate with Detailing and then seeing a change in the rendering result (compared to the original view)?

In this case, I literally used the copy command on the camera object.
Problem solved though
I have since determined the cause of the interference pattern, which was not a Revit issue. I really am at a loss to explain how it happened. At one point I had tried a ACIS.stl file to transfer the geometry. I had removed that link because it seemed impossible to add materials to it or to interact with the different surfaces. When I did the renders, the original camera did not detect the ACIS file. There must have been some settings in that view that kept it from detecting the file in new renders. Perhaps if I had right clicked on the view in the browser, it would have retained the visibility settings. Any new camera, however, saw the AutoCAD file and the SAT file in the same location and that created an interference pattern in the rendering. So somehow the link was reactivated without me being aware of it. I went back at removed the link again and the problems went away.
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