RE: [Flightgear-devel] New texture draw method

[Curtis L. O. <cu...@fl...>]

Norman Vine writes:
> YES I understand this.
>
> However this 23 bits of precision and another 23 bits of precision
> are not necessarily the same thing !
> Only by scaling all the numbers to occupy the same range
> < I could have used 1.0 > will the 'resolution' of the floating point
> format of two numbers be identical and thus have the same property
> of repeatability as that of fixed or integer representation.
>
> I agree that this differentation between 'precision' and 'resolution'
> of floating point representation is an obscure point that I have a hard
> time expressing.
>
> but as I said in my earlier post
> "Now all we need is for someone to test this"
>
> FWIW
> I allready have in other similar problems :-)

I think the problem will still be there because if you send your two
numbers down different matrix transformations (which is what happens
in flightgear ... each tile goes down a different transformation path)
then there is still a chance of round off mismatch between adjacent
tiles.

Curt.
--
Curtis Olson   Human Factors Research Lab       FlightGear Project
Twin Cities    cu...@hf...                cu...@fl...
Minnesota      http://www.menet.umn.edu/~curt   http://www.flightgear.org