To see the answer to the question, click to expand.

 

 1. Does V-Ray for Revit support Revit LT?

Revit LT does not support any third party plug-ins.
(
You can check this under API on the following page: http://www.autodesk.com/products/revit-family/compare/compare-revit-products?_ga=1.73906386.1596512571.1477395783 )

Due to these limitations, you cannot run V-Ray for Revit on Revit LT. 

 2. Are there more features in the product if it were licensed/purchased?

No, the licensed version is the same as the trial version.

 3. We have a wibu dongle with V-Ray 3Ds max licenses. Could we include the V-Ray Revit licenses into the same dongle?

V-Ray for Revit does not support dongle licensing, it uses an online license server instead. In the near future, we will be using online licensing for all of our products. 

 4. I installed the trial version; however, when I go to use it in Revit, nothing is available except 2 icons: Acquire license or License Server?

By default, when Revit is launched, your V-Ray for Revit license will not be automatically engaged, and the V-Ray toolbar will be grayed out in the UI. To pull your license and start using V-Ray, simply press the Acquire License button. Please also see question 5 below.

 5. I don’t want to click Acquire License every time I load Revit. What can I do?

If you prefer your V-Ray license to be engaged automatically every time Revit is loaded, use the  Obtain license on start-up option located in the Licensing tab of the Settings panel.

This option is disabled by default to provide users with flexibility in cases where:

  • The number of Revit licenses exceeds the number of V-Ray licenses.

  • Users are planning to share their V-Ray for Revit license/s across multiple machines (and multiple users respectively).

If enabled, the first users that launch Revit will also automatically pull a V-Ray license, whether the intention is to use V-Ray in that session or not. 

 6. Where can I see my V-Ray for Revit version?

The version is listed in the About box after expanding the Help menu.

 7. Where can I find the V-Ray for Revit material library?

The V-Ray for Revit material library is installed along with V-Ray for Revit. You can access it through the V-Ray UI when switching from AutoGen to VRayMaterial; or you can find it in the following folder on your computer:

C:\Program Files\Chaos Group\V-Ray\V-Ray for Revit\vrmateditor\materials  

 8. Is there an HDRI image library that comes with V-Ray for Revit?

Currently, there is not.
There is a default HDR image which is automatically assigned to the Dome Light when you enable the Use HDR image option for the first time. (You can find the image here: C:\Program Files\Chaos Group\V-Ray\V-Ray for Revit\content\Skybox)
However, there are plenty of free
.hdr and .exr resources online.

 9. Can I create V-Ray materials in Revit?

Yes, you can create V-Ray materials using the V-Ray Standalone Material Editor which is installed along with V-Ray for Revit.

 10. Where can I find the V-Ray material editor?

There are 3 ways you can open the material editor:

  1. Double click on any .vrmat material to load the material in the editor.
  2. Navigate to the following folder on your machine, and double click to launch vrmateditor.exe:
    C:\Program Files\Chaos Group\V-Ray\V-Ray for Revit\vrmateditor
  3. From the Material Map tab of the V-Ray Asset Browser, after you switch from AutoGen to VRayMaterial, an "Edit Material" icon () will appear. Click it to launch the vrmat editor.
 11. Can I use V-Ray for Revit materials in V-Ray for SketchUp as well?

Yes, the .vrmat material format is optimized to work in V-Ray for Revit, SketchUp and Rhino. 

 12. Can I use V-Ray for 3Ds Max materials in V-Ray for Revit?

Yes, you can. You will need to export those materials in a .vrmat format using the .vrmat Converter in V-Ray for 3Ds Max.

 13. Why is the V-Ray toolbar grayed out when I open a camera view?

This occurs in all Revit versions before 2017.2 because the Revit interface locks out the controls for plugins while in perspective view. To unlock the plugin, open any non-perspective Revit view.

 14. Does V-Ray for Revit support Revit 2019?

Yes, it does. For a full list of supported Revit versions, please visit the V-Ray for Revit System Requirements page.

 15. I’m trying to render a Revit decal, but it disappears from the rendering. Are Revit decals supported in V-Ray for Revit?

Decals are not supported at this time. However, you can simply create a material with the decal pattern and assign it to an object. The material can be either a Revit or V-Ray material. 

 16. I want to keep my Revit materials. Can I render them with V-Ray for Revit?

Yes, you can. You only need to have Revit materials assigned to the objects in your project. Once you render the project with V-Ray, all Revit materials will be automatically converted.

However, if you want to use native V-Ray materials, you would then need to switch from AutoGen to VRayMaterial. You can do this from the V-Ray Asset Browser located on the V-Ray toolbar in Revit.

 17. Are VRscans compatible with V-Ray for Revit?

Yes, VRscans are compatible with V-Ray for Revit.

 18. Do Revit lights work in Vray for Revit?

Yes, V-Ray supports all Revit lights including IES lights. Revit lights dimming and light groups are supported as well. 

 19. After I upgraded to V-Ray for Revit 3.50.01, all my V-Ray materials have disappeared. Why?

They have not disappeared. The location of the material library has been changed, and you can find it here:

C:\Program Files\Chaos Group\V-Ray\V-Ray for Revit\vrmateditor\materials

In this case you don’t need to remap any materials. Also see question 20 below.
 20. I moved my material library to another folder, and now all my V-Ray materials are lost. Is there an easier way to restore them without remapping them one by one?

Yes, in the current project, go to the Paths&Sharing tab of the Settings panel. Under Asset Paths, add the new path to your V-Ray materials. Next time you click Render, V-Ray will find them and automatically use their new location.

 21. After I upgraded to V-Ray for Revit 3.50.01 some of my materials are rendered differently/darker/lighter. Why?

We made some major improvements on how materials are handled. Therefore, all materials created with previous V-Ray for Revit versions are partially incompatible with V-Ray for Revit 3.50.01. They still can be used after an upgrade. 

 22. How can I upgrade my old V-Ray for Revit materials?

Simply follow the steps from the article on our Upgrade Old Material Library page.

 23. Why do I get very weak shadows produced by the HDRI map?

The HDRI map needs a very high dynamic range to produce sharp shadows. You might need to replace the HDRI map that you are using with another one with a larger range.

 24. Will all my V-Ray settings get lost if I open my Revit project on another computer?

Since the V-Ray settings are stored separately from the Revit project, you will need to transfer them when using a different computer.

For transfer instructions, please see question 25 below. 

 25. How can I transfer my V-Ray for Revit settings to another project?

Open the Settings dialog and go to the Paths&Sharing tab. Under Share Settings, select which V-Ray options categories you wish to export, then click Export. This will export the selected settings to an .xml file which can be imported for use in another project.

To import the settings, go to the Paths&Sharing tab of the Settings dialog again. Click Load and navigate to the exported .xml file. The settings which had been exported and differ from the current project’s settings will appear by category in the Import List. Select which settings you wish to import, and click Import to import them. In case you want to load another .xml file, click the Clear List button. 

 26. Why doesn't the size of the render seem to follow the model on the screen?

This is a matter of Resolution settings. In case you want to render the exact camera boundary as seen in Revit, set the Resolution to Crop Region. In case you want to set a specific resolution, use either the Preset resolution values or the Custom ones. 

 27. How can I render an elevation view?

Set the V-Ray Current view to ortho 3D view. Open Revit’s ortho 3D view. Set the view cube to any of the elevations. Enable Crop Region and adjust its frame. Set the V-Ray Resolution to Crop Region and render.