Hi all,
Firstly, I haven't taken the opportunity to say this before.. But
feel it is overdue.. A big big thank you to Robert (particularly) and
everyone involved in OSG. It has become an invluable tool for so many
projects for me, and the 'familly' that surrounds OSG seem to always
be available to help. This place is an exceptional example of
dedication and cooperation in the Open Source community. And I
personally have re-learned and learned many things using OSG in the
last 18 months or so. Fantastic!
I digress.. :-)
I posted a query to Robert a while back enquiring if he had any idea
why a piece of code that dynamically generated a model from
procedural sets of vertices, primitive sets, and normals and so on
would cause an indexing error and crash on the PC and not on the Mac..
Well I found a solution (working on something else in the same
project - as is often the way), and wondered if Robert, or anyone had
any comments, or if this is perhaps a bug in OSG.
I found that when I was creating a large object dynamically from
vertices and primitive sets that I was in fact generating one
primitive set per QUAD and adding all those primitive sets to the
single geometry object... Not very clever, and also not very fast! So
I was glad to find the mistake and correct it.. Boy did things speed
up for me when I did that!
So I altered this code so that it was just one primitive set
encapsulating the entire set of vertices.
This piece of code is also at the very heart of the code that causes
the crash on the PC, so I then went to see (in typical programmer
fashion) if the problem had magically gone away..
The crash on the PC has indeed gone away... and I can get it straight
back again by changing the code back.
My questions are..
1. Is what I did originally illegal? Whilst it's not very bright I
can't see that it is illegal. I can see some examples, pretty
esoteric I agree, but nonetheless some examples of where you may want
to grounp many small sets of QUADS in individual primitive sets. So
should this cause problems?
2. Is it perhaps simply a memory problem. i.e. Is what I was doing
very costly on memory and that causes the crash when it overflows..
3. Can anyone else replicate this crash? i.e. About 6 - 8 15,000
polygon models, all made of quads, with normal and colour attribute
arrays, all with parent primitive sets for each QUAD.
Thanks to anyone who wants to comment on this..
Kind regards,
Stephen.
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