This following is an excerpt of an e-mail from Bob Griffith. Let’s see if we can help him out!
“Two right isometric illustrations below. The wireframe includes extraneous or misconnected wires on the vertical boundaries which cause opaque “fences” to be thrown up in the solid rendering at the depressed regions of the boundaries (particularly noticeable at the right side entrance and left side exit to the arroyo running laterally through the property) AND a misleading trimming of the terrain at other boundary locations (particularly noticeable at the front boundary). This effect is more pronounced the more varied the terrain, and can even be seen in the more placid terrain example shown on your site as pertaining to your latest release. I have submitted on this [to Nemetschek] before (Terrain Map Artifacts, 1/28-30/2009), with nothing more than a recognition but no action.”
Click on the thumbnails below to see the images referenced in the excerpt.