cam_pos      = [0.50499, 1.49572, 0.290573]';
cam_dir      = [-0.719781, 0.0485842, -0.692499]';
cam_up       = [0.197024, 0.970825, -0.136676]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.885321, 0.312305, 0.942111]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;