Re: any idea or advice ?

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Thu, 8 Feb 1996 09:41:51 +0100

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On Feb 7, 5:13pm, ceti wrote:
> Subject: any idea or advice ?
> The subject is how to increase realism with an acceptable CPU cost in a
> sailling animation.
>
> So first, I need to simulate the wave trailed behind the boat.
> I plan to generate several polygons using the positions history and map an
> alpha texture on them.
> But I ve been told that under performer making a change in the geometry of
> the data base is really expensive ( rather than under GL ).
> So if anyone has an other idea or good advice, he is welcome.

This is really only the case if youre loading database & or mallocing etc.
To modify the vertices information in a geoset is relatively straightforward
but there can be some minor gotchas depending on process model. You may have
to use multiple copies of your geometry and round-robin their use.

>
> Second, when setting spinaker on, I want to see the change in the shape of
> the sail ( from the bag to the half balloon )
> To do this, should I rather use new morphing nodes of perf2.0 or keep
> the list of various shapes I have made ?

I suppose the former would be more flexible but the latter would be simpler.

>
> Thanks for the advices.
> /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
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> < _/_/ _/_/_/ _/_/_/ _/ _/_/_/ _/_/_/ _/ _/ >
> < >
> < BILLARD Olivier - Ingeneer R&D ++at++ C&I Software >
> < 1 avenue de la mer - 44380 PORNICHET - FRANCE >
> < Tel: +33 40 11 68 72 Fax: +33 140 61 68 14 >
> < Email: ceti++at++worldnet.net >
> \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
>
>
>-- End of excerpt from ceti

-- 
Angus Dorbie,
Silicon Graphics Ltd, UK
dorbie++at++reading.sgi.com

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