cam_pos      = [0.973134, 1.74848, 1.56912]';
cam_dir      = [0.0562396, 0.0134176, -0.998327]';
cam_up       = [-0.321719, 0.94682, -0.00539841]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.25707, -0.427575, -0.0765621]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;