cam_pos      = [-0.237367, 1.15104, -0.69264]';
cam_dir      = [-0.717268, -0.0586211, 0.694327]';
cam_up       = [0.0451916, 0.990443, 0.130307]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.924789, -0.166041, 0.941326]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;