2013-11-02

Revit + 3dsMax: Utilizing Render Techniques - A Winning Combination



It's been too long since I've had a guest post, so, I'd like for you to enjoy this rendering tutorial. I met Ryan on www.forums.augi.com when I was admiring his hospital renderings in the Gallery forums. Working on the Engineering side of the medical field, I don't know how to make pretty visualizations, but, I certainly recognized the photorealism and technical detail in the images he posted because they looked just like our OR's and patient rooms.

Please enjoy! 


Article by Ryan Baker Cameron, AIA, LEED AP, EDAC, NCARB
      @rbcameron1            ryan@ryanbakercameron.com           LinkedIN

Often times I hear that firms do not have the time to adequately perform high end visualization. 
Sometimes the excuses are different, Revit takes too long to render, we don't have enough detailed equipment, our staff isn't trained to perform this task or our client just isn't asking for it.
So what can we do as architects and engineers to improve the efficiency of creating visual acuity from our data models to aid in the development of future projects?  For the most part it relies heavily on the user's ability to go the next level.  In this article I will describe a quick process one takes to go from Revit then 3dsMax for faster and more accurate rendering without taking massive computing resources from your stable Revit work environment. 
In this demonstration I will use the 2013 versions of Revit and 3dsMax without the workflow manager suite installed.  While it is not necessary to have the BDS (Building Design Suite), it does require use of two sophisticated software’s, 3dsMax Design and Revit Architecture (*MEP, *Structure).  That being said, do not let the thought of having to learn 3dsMax become overwhelming.  We will be tip-toeing around 3dsMax's rendering settings, adding a camera plus lighting system and hitting the render button.  All of which are reasonably similar to Revit.  For instance, to place a camera in 3ds in any view, click on "Create"-"Camera"-"Free Camera" and click anywhere on the modeling screen.  Makes sense right?
This lesson will demonstrate suggestions and techniques to get these results (below) from your Revit model without the cloud and without rendering in Revit:



Step 1:
Content is King.  Before you even begin the unspoken rule is that content is king. If you don’t have objects to put in the scene, you just have the room. The realism from a rendering isn't always having the right camera angle, or proper lighting: it is the "look and feel" of the room and how content is managed.  Including that little extra step like adding your MEP consultant's electrical outlets can sometimes make the difference.  The big idea behind "Content is King" is to model everything you would expect to see in the room.  If your firm doesn't have the resources to pay its employees ($110/hr) to create families to your company standards, it can be quite affordable to hire that out, or Google search just a little harder.  Personally I create almost all of my own equipment and post it online on a fee based download website called Turbo Squid.  (Sorry, no link as I'm not blogging to sell).  This is how I started, by paying a few bucks for a handful of Revit models created by experts; I was able to "reverse engineer" some of the processes to create high-end data-rich Revit families.


Step 2:
Materials baby, yeah!  Although you might think materials belong in the first category; materials shape the environment in a much different way than objects alone.  Really getting into Revit's custom library option is a huge benefit I don't think a lot of firms are aware of or taking full advantage of.  My only issue is that custom texture maps are not easily transferable to consultants and clients.  Meaning, if I have a texture on my server and I send my model over to my consultant (without material files) and they open the model and try to render, they will receive an error stating they don't have TextureXYZ.jpg and so forth.  So be aware that it is beneficial to utilize whatever options Revit has for materials since they are file-folder location based.  (Ex: SketchUp is model location based, meaning once the material's texture map is in the model, it creates a swatch that auto-embeds into the file without having to stay connected to the original location of the file.)  Below are a few examples of custom maps I have in this ICU Revit model.


Step 3:
Super Models are hot.  Now that you've created this fantastic mega-model, what's next hot-shot? This is generally the easiest step because you are building the model in Revit already.  Once you're done locating your equipment, walls, ceilings, lights, etc. in Revit, add your camera view and get the general feel for the room to be as exact as you want it.  Once this is ready, save the file with everything in the 3D View turned on (that you need turned on) and I find it helps to temporarily close out of the Revit model when you reach the import/export point.  (And yes, it does work if you load the central model instead of your local)

Step 4:
Link me up, before you go go.  Ready for the big show?  Technically while you aren't importing into 3dsMax, you are linking, which is sort of like Xref's back in CAD.  Only a few key things to look out for here.  Click the 3dsMax Logo (top left corner) then "References" - "Manage Links".  Locate the Revit file you plan on linking and once you've done that, you should get a screen asking you to select a 3D view.  I usually choose Default {3D}, but that's just me.  Next I select from the pull-down menu - "Do NOT combine objects".  Now I attach the file.  Notice a window pops up and I uncheck the boxes for Daylight and Cameras.  However, for some reason, they come in the model anyway.  I will always immediately delete the daylight and Revit cameras.  (Although it helps to keep the Revit cameras sometimes!)  I will immediately create a new Daylight system by simply clicking "Create" (up at the top) - "Lights" - "Daylight System".  A message pops up and I just click yes.  To place the Daylight System, click anywhere in the scene and click again to size the compass (it doesn't have to be huge) and then move my cursor around until I get the "Sun" in the sky and out of the way.  (It is a little tricky)





Step 5:
Light the way.  Now that you have a standard daylight system in the model, the next thing to do is literally turn on the lights.  What's great about Max is that it will read whatever data your lights were set to in your Revit model.  So if they are 1080 Lumens at 3200 K, that might be really dim with an orange-red glow.  Click on the light you want to turn on and head over to the modify tab in the properties panel.  In the below image, the 5" clear specular downlight is selected.  By checking "On" this will turn on every single 5" clear specular downlight from the linked Revit model.  The same goes for the other lights when you turn them on, as well as their individual settings, such as the lumens and kelvin temperature.

Step 6:
Render me this, render me that?  Basically in a nutshell you are done.  You've got your camera view selected, lights are on, Revit materials are mapped.  Hit F10 on your keyboard to view your render output settings as well as "8" on your keyboard for the environment settings.  For the environment on INTERIORS, I usually recommend starting at 10.5 for the exposure value.  The other settings, while important, can be ignored for your first test render.  For the render output settings, I will change the default custom resolution to HD and 1920 x 1080 output, under the "Common" tab. The "Indirect Illumination" tab settings will temporarily be changed to a Medium Final Gather, with Global Illumination enabled and a Diffuse Bounce value of 3.  (see images for exact settings)  The final image is what I call the test render (1st image is always a test) to see our starting place.  It took about 19 minutes and 34 seconds - All interior and exterior lights were on at 1080p HD resolution at 300dpi.  Clearly something Revit would not be able to do in such a short amount of time.




BONUS ROUND:
 
Mini-tip:  Didn't I say in the first paragraph that I would render without taking up massive computing resources once the render has started?  Well in the below image, this is how.  Open Windows Task Manager and under the processes tab, right click on 3dsMax.exe, then choose "Affinity".  This opens the CPU's processor allocation.  I will turn off CPU "0" so that Revit has enough juice (one core) to power itself uninterrupted while 3dsMax does what is does best.  As long as you don't turn off all the processors, 3dsMax will continue to operate.
Wait, can you do this to Revit while it renders?  Why, yes, you can.  However, Revit renders through a program called fbxooprender.exe, so right click on that instead of Revit.exe.  Same process by right click and setting the affinity to use a particular set of processors.

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