cam_pos      = [0.244849, 2.01094, 0.0698391]';
cam_dir      = [0.367539, -0.437756, 0.820539]';
cam_up       = [-0.241922, 0.806916, 0.538851]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.19433, 0.527418, -0.253591]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;