I found a fix to the problem. This drawing had 3d solids exported from Revit and 3d blocks imported from Autocad 2012 which were from a previous Nxt rendering. Opening the materials browser in Autocad 2013 and deleting the Accurender:white material then purging the drawing resolved the issue.
I will check out your drawing when I get a chance. This is likely a known issue which has to do with AutoCAD versioning. It may be important to have nXt loaded when passing nXt data around.
"Yeah-- like I mentioned the caustics are accurate but could be annoying. Things that might alter it include changing the sun angle so it's not striking the chair's metal surfaces so directly, changing the roughness of the chair…"
"Here's the latest render using metallic materials.
The chrome now looks a lot better.
I do feel though that the reflected light on the back wall is too bright."
"Ah-- so that's a function of the material type. The standard material won't give you a mirror anymore. You need to change the material to metallic and you should get something more familiar. Use the Type popdown on the…"
"You can see from these two images that there is definitely something wrong with reflective surfaces.
It appears the light is being reflected, but not objects or textures.
In the nXt version (top image), the carpet texture is being reflected in the…"
"It's interesting-- overall the quality of this interior is very high for that short amount of processing, and may be acceptable for certain scenes. In this one, however, there are some reflective caustics that are taking longer to…"
"ARDECAL now works.
Here's the image after 10 minutes of rendering.
I do have a slight concern that reflective surfaces seem rather dull.
This is particularly evident on the end frame of the desk and the base of the chair."