From: Dave Akers (dla@engr.sgi.com)
Date: 05/02/2000 15:58:17
Hi Werner,
As Ballard suggests, scaling everything up means that your fill
requirements go up too. Since your performance is limited by fill-rate
rather than geometry, you should expect performance to go down as you
scale up the volume..
Performance wouldn't depend so much on scaling if you were using more
geometry in your scene (e.g. finely tesselated regions of interest.) If
you haven't already, you might consider using a "space leaping" technique
(see voglSpaceLeap demo) to adaptively tesselate the volume's geometry
based on the texture lookup table being used. This would decrease your
dependence on fill rate somewhat if large regions of the volume are
totally transparent.
Dave
On Tue, 2 May 2000, ballard andrews wrote:
> You maybe rescaling the polygons -
> that would run slow if you have a lot of them.
>
>
> Werner Wohlfahrter wrote:
> >
> > Hi,
> >
> > I use Volumizer in combination with OpenInventor.
> > I put an SoTransform node before the volume in the scene graph.
> > If I for example double the scale the volume is scaled correctly but my
> > application slows down drastically.
> > Why?
> > What happens to the volume internally?
> >
> > Thanks ww :)
> >
> > --
> > \|/
> > @ @
> > ======================================================oOO(_)OOo=====
> > Werner Wohlfahrter
> > Fraunhofer CRCG, Inc.
> > 321 South Main St.
> > Providence, RI 02903, USA
> >
> > phone : (+1) 401 453-6363 x110
> > email : wwohlfah@crcg.edu, ww@cg.tuwien.ac.at
> > url : http://www.crcg.edu/ww
> > icq : 9611406
> > =====================================================================
>
> --
> Dr. A. Ballard Andrews
> Senior Research Scientist
> Schlumberger Doll Research
> Old Quarry Road Ridgefield, CT 06877
> tel: 203-431-5522 fax: 5521
>
This archive was generated by hypermail 2b29 : Wed May 03 2000 - 17:54:34 PDT