I am using the Orthographic Camera as a way to create a map of a terrain. This is a map for workers to use to plan and select virtual shooting locations for the scenes in a movie. I started out with a square area 16km on side and went to 32km because of the concern that the end of the instantiated vegetation might become visible from an aerial shot. Finally I went to an area 64km on a side. This is where I started to see some unwanted artifacts. As you can see, the light blue polygons only appear around the edges and aren't visible in the 32km middle block where all of the action is to take place. I suspect that the cause of the problem stems from the fact that the orthogonal projection is linear while the surface of the Earth is not. I would expect the curvature of the Earth to play a role in getting some deformation in the image and even clouds toward the edges because I expect that the Y position where I put the camera is not a true altitude along a sphere enclosing the Earth but a plane that projects out into space. Still, I am not starting to see clouds but I am getting these large polygons that shouldn't be there. I tried turning off the atmosphere and clouds but the polygons just got black instead of light blue so I am convinced that the problem has something to do with the presence of the sky.
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At present, this is not a serious problem for me as the map will never appear in the production itself but is only a tool for planning the shots. I don't expect the polys to show up in renders from perspective cameras used to produce the movie. Furthermore, the unwanted polys don't seem to be in the central area of interest. This image was generated with the latest release.
