cam_pos      = [-0.71541, 1.22934, -0.540466]';
cam_dir      = [-0.349248, 0.101385, 0.931529]';
cam_up       = [0.317045, 0.948281, 0.0156573]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.17275, -0.400071, 0.483228]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;