cam_pos      = [-1.08813, 1.64978, -0.22369]';
cam_dir      = [0.0447088, -0.352105, 0.934892]';
cam_up       = [0.032743, 0.935841, 0.350897]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.32796, -0.0198476, -0.0709812]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;