cam_pos      = [0.289718, 1.09556, 0.357469]';
cam_dir      = [0.451052, 0.562101, -0.69325]';
cam_up       = [-0.569723, 0.779243, 0.261145]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.913709, -0.368637, -0.893389]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;