cam_pos      = [-0.968375, 1.67123, -0.324718]';
cam_dir      = [-0.111406, -0.155976, 0.981458]';
cam_up       = [0.00292533, 0.98755, 0.157276]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.32172, -0.0271222, 0.145719]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;