Path: chuka.playstation.co.uk!news
From: alex@teeth.demon.co.uk (Alex Amsel)
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: Help: GsSortObject4 & GsSortOT
Date: Tue, 28 Oct 1997 15:44:52 GMT
Organization: Into Beyond
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References: <344e12ea.11334163@news.playstation.co.uk> <344E2A0F.15B5@interactive.sony.com> <3450cb36.3408555@news.playstation.co.uk> <632bv2$ju04@chuka.playstation.co.uk>
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On Mon, 27 Oct 1997 15:18:10 -0000, "SCEE"
<dev_support@interactive.sony.com> did quoth at me:

>>Another question now...
>>
>>If I have an OT length 8 (256), does GS automatically shft my Z values
>>by 8 or does it only do it by 2?
>>
>8, you say 8 or 2 as if your having problems what up?

I'm more trying to establish exactly what GS is up to as I haven't
found anything that makes it clear.

You can set the OT Length to between 1 and 14 (powers of 2).

Does GS *automatically* shift your Z values such that the OT can take
a world using values of 0-65000?

For an OT length 14, GS would always shift Z by 2.
For an OT length 13, GS would always shift Z by 3
etc.
etc.

This would mean that the OT_SHIFT used when adding objects to the OT
is there purely to allow worlds bigger than 65000 odd.

I'm sure in some early demo code wwhen an OT of length 12 was used an
OT shift of 2 was added. I did a quick test and I trashed my code when
not shifting my object's Z value by the expected amount, but it wasn't
exactly a 100% solid test.

Also, again I have read some conflicting information about something
else:

I would have thought a smaller OT reduces memory useage as well as
increases rendering speed and leaves primitive creation speed
unchanged.

I'm sure in the docs it hinted that a smaller OT actually works
slower.

Again, wouldn't be hard to test but if you guys already know ?-)

Finally, saw that CD on one of the playstation mags. What is on there
exactly?

[Got an artist to do something for me on Fiskball over the next month
or so, fingers crossed I'll have a bit of time to work on it!]


Regards, 

Alex Amsel

+ Tuna Technologies + Telephone & Fax +44 (0)114 221 0686 +
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