cam_pos      = [0.411208, 0.736053, 0.201084]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.565868, 0.556836, 0.608052]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0514203, 0.955939, -0.923274]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;