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000392_owner-lightwave-l _Sun Feb 19 18:33:54 1995.msg
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Date: Sun, 19 Feb 1995 05:32:48 -0500 (EST)
From: Joe Angell <jangell@risd.edu>
Subject: re: Bar Graph
To: lightwave-l@netcom.com
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On Fri, 17 Feb 1995 dnakakihara@BIX.com wrote:
> I am trying to make a line on a bar graph slowly appear from left to right. I
> figured a transparency image map sequence would do the trick, but it seems
> like I can never make the object *totally* transparent. There is always a
> faint outline of it. I've even tried it with no image map and just 100%
> transparency. However, if I set transparency to 200%, the object is totally
> gone. My questions are: 1) how do I animate my bar graph?, and 2) why isn't
> 100% transparency 100% invisible?
There are 2 other ways you may be able to go about doing a bargraph:
1) Have the bars slide in through the "ground" or "wallS" or whatever.
It'll look like they're growing. If there isn't much of a border around
the wall, make another object S(say, a plane) to cover the area and either
Front Projection Map the BG on it or make it the background Black color
(Diffuse 0, color 0,0,0)
2) Morph. Make one object that is your finished bar. Save it as
BarMorphed. Select the end of the bar and drag the point until they
overlap the base points S(do NOT do a merge points). Save it as BarFlat.
Load'em into Layout.
Disolve BarMorph out to 100% from the Object panel. Go to BarFlat,
and assign a morph envelope form fram 10 to fram 100 (for 3 seconds), and
assign the BarMorph as the morph target (you can make this REALLY
interesting by changing the object surfaces, too...) This will make the
bar grow over 90 fames into the full bar.
You'll notice a problem with this -- there'll be a flat colored square
where the BarFlat object hasn't started morphing yet and is just sitting
there, looking ugly. There are two ways to fix this: Either move the
object beyond the "wall" or the graph, so it is unseen (but onlyslightly,
so it'll grow through the wall), or the more elegant Dissolve Envolope,
where the BarFlat disolves in one frame as soon as the morph starts.
As for the transpareny thing, I don't know about that one. Sorry. You
might want to try a clip map instead, as that's the closest thing to
physically changing the polygons. Also, instead of making a whole image
sequence, just make the 1st frame of the sequence (where it is completly
transparent) and us the Texture Velocity option to move it across the
object's surface -- it uses a LOT le disk space. Hope all this helps...
-- Joe