cam_pos      = [0.176865, 1.44399, 0.303889]';
cam_dir      = [-0.856198, -0.18379, 0.482853]';
cam_up       = [-0.238103, 0.969789, -0.0530709]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.60982, 0.213343, 1.16254]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;