Elevation drape reference becomes jagged when clipped

Hello,

I am running into a problem with a reference. The reference file is a series of triangles generated by InRoads, and they have been given an elevation draped pattern for a site. The file is used as background information, and as our designs evolve, we need to clip areas for new structures, roads, etc. We use this to generate images and drawings. For some reason, when anyone applies a clip mask to the reference, parts of the reference become jagged. It is as if lines emit from the center of the clip, and any shapes they cross lose their ability to display the elevation drape properly. Below is an explanation of how the reference was made.

Background:

The work flow is: 1. Receive topographical information 2. Use inroads to generate triangulated surfaces 3. Apply an elevation drape pattern to the site. 4. Use it for backgrounds. 5. Clip as necessary in models and drawings.

Assembly if the image drape on a large site:

The satellite image are usually over 5000x5000 pixels, so I have to chop it up into a grid of smaller images. I also have to chop up the triangulated surfaces into smaller squares (ex: 1km x 1km) and put them on separate levels. Each square receives its own elevation drape material. This method is time consuming but it seems to offer the highest quality images.

In the video, both sites have an elevation drape applied to them. The only difference that I can think of is that the left side has some mesh elements in it, while the right side is all triangle shapes from InRoads.

Does anyone know why this could be happening?

Thanks,

Andre