cam_pos      = [0.69838, 1.64486, 0.327699]';
cam_dir      = [-0.14717, -0.253949, -0.955955]';
cam_up       = [0.0369808, 0.964391, -0.261883]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.3146, 0.0982782, 0.176276]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;