I’m having trouble verifying the z values returned by picking. The red book says, and internet searches agree, that the value varies from 0.0 to 1.0 with the returned value first being multiplied by 2^32-1 ( which is ffffffff ) and then rounded to the nearest unsigned integer ( p. 474 of the red book, version 1.1 ). Code on p. 477 prints out the values after being divided by 7fffffff.

- Is the count measured from the eye(0) to infinity(1.0)? Or between the near plane of a frustum (0.0) and the far (1.0)?
- Why is the divisor 7fffffff? It would seem to need ffffffff to divide back to the original number? The printed values are about 1.5 for my model.

Thanks,

Barry