It is indeed a rather large margin. You can see for yourself if you get
a primitive null, set an exporer to All Nodes, then right click and
expand all on the null. There are at least 50 parameters there, some of
them int's, but most of them doubles.
We tested our mesh cache system on models of 50,000 points and up, and
we were able to get playback at 24 fps. I just tested keyframe
transformation animation on 1000 nulls and the best playback I get is 8
fps.
> > You can always expect that you'll reach a point where the most
> > efficient solution is to simply model what you need, and blend that
> > into the performance result.
>
> Yeah, it's called the beginning. ;-)
>
> While it may be more memory efficient to translate a few points than use
> null deformers, I don't think it's by the margin you're assuming. The
> advantage to using nulls is it gives you more options (even if ugly) - which
> you don't seem to have as you're currently locked into the shape system and
> it's quirks/limitations. Honestly, what does the shape animation system
> give you that you cannot replicate using null deformers?
>
> Matt
>
> ---------------------------
> Matt Lind
> Animator / Technical Director
> Softimage certified instructor:
> Softimage|3D
> Softimage|XSI
> Matt(at)Mantom.net
>
>
>
> Date: Sat, 29 Jul 2006
> To: XSI(at)Softimage.COM
> From: withanar(at)stanwinston.com
> Subject : RE: Secondary Shape Madness
>
> I'm already using envelopes on a serious of nulls representing a volume.
> And that's riding on top of another system, which is riding on top of
> another. The thing is, it doesn't matter how many nodes you use in your
> deformer. You can always expect that you'll reach a point where the most
> efficient solution is to simply model what you need, and blend that into
> the performance result.
>
> Each null * envelope weight consumes significantly more memory than the
> 3 double values required to translate a point. It would be far more
> efficient to write a simple scripted op transfering the
> Points.PositionArray from one model to another.
>
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