cam_pos      = [0.486228, 1.50805, 0.314645]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.658079, 0.749607, -0.0708612]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.634527, 0.648952, 0.972181]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;