I'm using Sketchup 8 Professional to generate a terrain mesh and have encountered an odd problem much like the one seen when two faces are back to back. Specifically, I used the Cloud v8 plugin to import an XYZ point cloud and used the Triangulate Points [TIG] plugin to generate faces for the terrain mesh.
The "patches" appear randomly as you rotate or pan the model and remain on the screen if you stop in certain positions. The problem becomes more pronounced as you zoom in. I have verified that the mesh does not have duplicate faces that are back to back and my display drivers are up to date. Has anyone got a clue what is happening?
See images below for examples of the problem.