Scripting - Per frame higher\lower in value equals 2004-04-13 - By Bradley Kachel
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Big thanks for the advice guys.
Helge, because the object going +\- on Y will be inheriting alot of it's
motion (being a character) it won't have animation directly on it.
So I'm guessing the only way around it is to plot it's transforms once the
animation in final, and then let the expression do it's thing.
Or is there a better way I don't see?
Thanks again,
Brad K
>From: "Helge Mathee" <helge.mathee@(protected)>
>Reply-To: XSI@(protected)
>To: <XSI@(protected)>
>Subject: Re: Scripting - Per frame higher\lower in value equals
>Date: Tue, 13 Apr 2004 21:13:08 +0200
>
>I'd use an expression which uses the value at the current frame minus the
>one at a frame before.
>Evaluating a min max between 0 and 1 should work.
>
>Try_
>
>0.5 + MIN( MAX( ( null.kine.local.posy - at_frame( Fc - 1,
>null.kine.local.posy ) ) / 0.3, -0.5 ), 0.5 )
>
>
>Where 0.3 is the treshold so to say the maximum difference between actual
>frame and the previous frame.
>
>Note: the parameter used (which is null.kine.local.posy in this case) has
>to
>be driven by a fcurve!!
>
>-h
>
>-- -- Original Message -- --
>From: "Bradley Kachel" <acidboy21@(protected)>
>To: <XSI@(protected)>
>Sent: Tuesday, April 13, 2004 8:44 PM
>Subject: Scripting - Per frame higher\lower in value equals
>
>
> > Hi guys,
> > Just a simple scripting Q that I have no idea how to approach.
> >
> > I want to have a blend constraint value driven by whether another object
>is
> > going higher or lower in it's Y value.
> >
> > EG,
> > If it is going higher in Y -> blend = 1,
> > If lower in value -> blend = 0.3
> > Naturally it would have to be calculated each frame too.
> >
> > I'm using it to drive some simple armour on a character, so it sticks to
>the
> > body when it's going upward and dragging when going downward.
> >
> > Any advice would be majorly appreciated.
> >
> > Thanks.
> > Brad K.
> >
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