Terrain extractor interpolates their elevation by first finding the face that the point is on? How do you do Planar Interpolation?

I called Bentley and they told me that Openroads uses terrain extractor to interpolate elevations inside the triangles on a digital terrain model to create a surface, but I don't understand there method...
Why is the Civil Labeler Text Tangent to Rotated View?

Product(s): OpenCivil Designer Version(s): 10.10.+ Area: Civil Labeler Original Author: Marcus Blake, Bentley Technical Support Group Question: When using the Tangent...
Why manhole rim elevation assigned to pipe crown level?

Manhole rim elevation ref assign to proposed ground elevation. Still when seen in profile view manhole is not seen correctly.Refer Image below:
Geopak V8i Superelevated cross sections are not smooth, any idea why?

As you can see below, in the areas where my cross sections are superelevated, this is what they look like. Specifically this is how they look in-between each of the stations I defined in the excel import...
Power inroads (ss10) with open roads technology

Has any one seen this error. The corridor was working the week of 8-14-23, now when I process the corridor I am getting this error. I tried a back up file from last Thursday and I still get this error...