cam_pos      = [-0.438916, 1.43477, 1.22925]';
cam_dir      = [0.926674, 0.067683, 0.369723]';
cam_up       = [-0.0804935, 0.996568, 0.0193131]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.488306, 0.0633841, -1.23549]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;