cam_pos      = [0.551696, 1.65325, 0.326208]';
cam_dir      = [0.15942, -0.111259, -0.980921]';
cam_up       = [0.0544616, 0.993107, -0.10379]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.31099, 0.0490455, -0.218627]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;