Re: Curve length and scale

[Nicolas Langlois <nicolasl(at)buzzimage.com>]

Good point Kim.
Would have to shove in the Bounding Volume X,Y an Z also to make it more 
accurate. It's only when the boundary is 0 that it's wrong though.




Kim Aldis wrote:
> I can't see that working. Consider what that result would give if the curve
> bounds were, say, 0 in y and the scale was (1,300,1 ). Your curve length
> would be divided by 300 when it's  length is un-affected by scale.
>
>   
> > -----Original Message-----
> > From: owner-xsi(at)Softimage.COM [mailto:owner-xsi(at)Softimage.COM] On
> > Behalf Of Matt Lowery
> > Sent: 07 June 2007 16:45
> > To: 'XSI(at)Softimage.COM'
> > Subject: RE: Curve length and scale
> >
> > That sounds like what I'm after.
> >
> > Thanks Nicolas.
> >
> >
> >
> >
> > -----Original Message-----
> > From: Nicolas Langlois [mailto:nicolasl(at)buzzimage.com]
> > Sent: Thursday, June 07, 2007 4:17 PM
> > To: XSI(at)Softimage.COM
> > Subject: Re: Curve length and scale
> >
> >
> > Matt,
> >
> > it depends how you go about it but if you go through a scriptedOp to
> > find the curve length (always evaluated), you could multiply it by the
> > reverse of the scaling in X, Y and Z so that it counter calculates the
> > scaling in the curve length and thus gives you the length in world
> > units
> > all the time.
> >
> > #PYTHON EXAMPLE PSEUDO-CODE
> >
> > def currentLengthSCOP_Update(ctx, out, InCrv):
> >     length = InCrv.Value.Geometry.Length
> >     sclx = InCrv.Kinematics.Global.Parameters("sclx").Value
> >     scly = InCrv.Kinematics.Global.Parameters("scly").Value
> >     sclz = InCrv.Kinematics.Global.Parameters("sclz").Value
> >     out.Value = length * (1 / sclx) * (1 / scly) * (1 / sclz)
> >
> > --
> >
> >
> > Nicolas Langlois
> > Senior Rigger / TD
> > Buzz Image
> >
> >
> >
> >
> >
> >
> > Alexander Hemery wrote:
> >     
> > > Hi,
> > > how about a script that duplicates the curve, freezes scaling,  runs
> > > GetCurveLength ..prints the result and then deletes the new curve ?
> > >
> > > Alex.
> > >
> > > ----- Original Message ----- From: "Oz Adi" <oz(at)broadcast.co.il>
> > > To: <XSI(at)Softimage.COM>
> > > Sent: Thursday, June 07, 2007 2:45 PM
> > > Subject: Re: Curve length and scale
> > >
> > >
> > >       
> > > > you can "fit" a new curve on it, which will create a scale 1 new
> > > > curve, and then print it's length.
> > > >
> > > > here's a little script to do so (jscript), select the curve and run
> > > >         
> > it:
> >     
> > > > /var oCrv = Selection(0);
> > > > var tempcurve = ApplyGenOp("CrvFit", "", oCrv, 3,
> > > > siPersistentOperation, siKeepGenOpInputs, null);
> > > > SetValue(tempcurve+".points", 100, null);
> > > > var newcurve = Selection(0);
> > > > logmessage (newcurve.ActivePrimitive.Geometry.Curves(0).length);/
> > > >
> > > > the SetValue line sets the number of points on the new fit curve, so
> > > > if you got a longer curve set this value up..
> > > > I am still learning scripting, so I jump on any simple opportunity
> > > >         
> > to
> >     
> > > > write  a stupid code :) hehe
> > > >
> > > > Oz.
> > > >
> > > >
> > > >
> > > >
> > > > Matt Lowery wrote:
> > > >         
> > > > > Hi all,
> > > > >
> > > > > does anyone know of a way to measure the length of a curve in xsi
> > > > > units that
> > > > > isn't dependant on the scale of the curve's centre?
> > > > >
> > > > >
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--


Nicolas Langlois
Senior Rigger / TD
Buzz Image

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