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000312_owner-lightwave-l _Tue Jun 28 17:01:42 1994.msg
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Date: Tue, 28 Jun 1994 16:12:08 -0700
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To: lightwave-l@netcom.com
From: mccabejc@sce.com (Jim McCabe)
Subject: Re: Cutting open objects
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Eric Castro writes:
>
> I am currently working on a project for an thermodynamics videotape,
>and I have a couple of lightwave related questions. The animation I am
>trying to create is a piston moving inside of a cylinder, with the cylinder
>cut away to show what is happening inside. What I would like some help with
>is the following:
>
> 1) How best to "cut away" into a cylinder, i.e. create an opening in an
> otherwise normal cylindrical shape. Is there a way to subtract an
> object from another object in modeler?
>
> 2) How to include a coordinated 2-D animation (such as a point moving along
> a graph). Preferably using the anim frames as backdrops, but a surface
> mapped onto a plane will also do.
As far as the 2-D animation, if you have a program such as DPaint you can
make the animation there, then break it into indivudal frames using ADPro or
the like, and map the images onto a plane in your animation. Or you could do
the graph in Lightwave. If you have the latest Lightwave there are some
excellent macros which make 3-D graphs out of equations you specify. You
could have a moving plane which originally blocks the graph from view, and
moves during the animation to expose the graph (giving the graph the
appearance of moving). The cutaway cylinder can be done by using Lathe or
Extrude, or just making two concentric cylinders and cutting away half and
cleaning up the loose ends.