Re: How to change parameters of an object?

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 28 Sep 1999 13:52:18 -0700

If you do this you'll have to use uniform scaling of build a pfmatrix.
Non uniform scaling isn't recommended for performance reasons on some
platforms. The matrix scale approach will also have adverse effects on
the length of some surface normals, forcing you to normalize.

Cheers,ANgus.

Allan Schaffer wrote:
>
> Another approach would be to simply make the node containing this box
> a child of a pfDCS node, and then scale the DCS.
>
> If you have many boxes of different sizes, make a single 'unit box'
> node the instanced child of many parent pfDCS nodes, and apply
> different scaling operations (as appropriate) to each pfDCS.
>
> Allan
>
> On Sep 28, 12:36pm, Angus Dorbie wrote:
> > You need to find and modify the geosets. Most information as it pertains
> > to the original file is lost.
> >
> > You could modify the file and reload but I suspect that doesn't meet
> > your needs.
> >
> > Inventor is not the native format of Performer. It has a native INTERNAL
> > format which you'll have to become familiar with if you want to mogify
> > geometry in this way.
> >
> > Cheers,ANgus.
> >
> > Fangtu Qiu wrote:
> > >
> > > I have a database file like:
> > >
> > > #Inventor V2.1 ascii
> > > Separator {
> > > Cube {
> > > width 100.0
> > > height 100.0
> > > depth 10.0
> > > }
> > > }
> > >
> > > After I load it by pfdLoadFile, how can I change the width,
> > > height or depth of the cube?
> > >
> > > Any hint and reply will be appreciated.
> > >
> > > Fangtu
>
> --
> Allan Schaffer allan++at++sgi.com
> Silicon Graphics http://reality.sgi.com/allan
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