cam_pos      = [0.69838, 1.64486, 0.327699]';
cam_dir      = [-0.045432, -0.208215, -0.977027]';
cam_up       = [0.049594, 0.976361, -0.210379]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.32699, 0.0771569, 0.0452624]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;