Hi all, I have a terrain which is spherical, according to earth shape. The center of the earth is (0, 0, 0). I have my camera class, which has vDir, vUp, and vRight perpendicular each other. If I rotate my view up or down, I rotate my camera vDir and vUp using vRight as the rotation axis. If I rotate my view left or right, I rotate my camera vRight and vDir using my current eye coordinate (i.e. vector from (0, 0, 0) to eye point) as the rotation axis. The vUp vector the calculated using cross product of vRight and vDir. I use eye vector so that my view will align properly with the earth spherical shape. My view matrix is made using Direct3D LookAtLH function, with eye point, lookAt point and up vector as the parameters. Using this method, I got a kind of ''pincushion effect'' while rotating my view. The screen looks like being a little convex. Is my camera class method correct for this kind of terrain? Thanks very much.

The easy way is to keep your camera still, at some distance away from the planet. Then rotate the planet all you want. You don''t have to re-build your view matrix.

Thanks guys,

I tried to lower my field of view to 30 degrees, from 45 degrees before. The pincushion effect seemed less.