Path: chuka.playstation.co.uk!news
From: Developer Support <dev_support@interactive.sony.com>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: GsLinkObject4
Date: Mon, 07 Jul 1997 16:26:27 +0100
Organization: PlayStation Net Yaroze (SCEE)
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Jon Prestidge (alias Moose) wrote:
> 
> Does this happen to anyone-else?....
> 
>    I set-up TMD data on-line in my program (as apposed to loading it in
> from a file).  I create it with absolute addresses to begin with -- so I
> set the flag in the TMD header to show this and I don't bother calling
> GsMapModelingData.   Before I call GsLinkObject4 everything seems fine (I'm
> checking this in the debugger) all the TMD data is set-up as expected.
> However after the call to GsLinkObject4 the first primitive has changed --
> it's ilen and olen have been over-written with the number of primitives in
> that TMD object.   All other primitives are OK, as are all the other TMD
> components.    But this change in the first primitive does not seem to
> cause any problems... the object appears on-screen fine and I would never
> have noticed it unless I had been checking things through on the debuger as
> a matter of course.   If I set the ilen and olen back to what they were
> before the call to GsLinkObject4 in the debugger and then resume running
> then the program, it crashes (freezes, or whatever) on GsSortObject4
> later-on.
> 
> Is this supposed to happen or is there a memory bug in my program (that I'm
> getting-away with sofar but might catch-up with me later)?.
> 
> Jon

If you look at pre-calculated TMD's the number of primatives replaces
the
ilen and olen of the first primative of a type. I'm not sure what this
is
for, and we have no documentation about it. I wouldn't worry about it, 
we've been playing about with TMD's at run time for nearly a year, and
have 
had no problems.

Stuart