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Re: [PSUBS-MAILIST] Reverse engineering in CAD
Peter,
Check out Anim8or :
http://www.anim8or.com/main/index.html
Manual
http://www.anim8or.com/manual/index.html
It has "skinning" too and a host of tutorials and add-ons.
And, it;s free.
--Steve
On Thu, 17 Jun 2004 18:59:17 -0700 Ian Roxborough <irox@ix.netcom.com>
writes:
>
> Hi Peter,
>
> I don't really know anything about autocad2004, but if it's worth
> it's
> salt then it I'll probably have the following features.
>
> NURBS!
>
> See if your cad/modeling software has Nurbs support (Nurbs are just
> fancy curves or a fancy word for curves). You should be able to use
> the Nurbs tool to create some boat like curves, similar to the ribs
> of a woodern boat (you may want search drawning Nurbs or curves on
> the internet or in the library, but if mess around long enough
> you'll
> probably get the hang of it).
>
> Once you have enough curves (draw them a foot a part, or whatever
> you
> think it takes) to get it to start looking boat-ish, then save your
> work and look for a "skinning" tool. A "skinning" tool (I've no
> idea
> what it will be called in autocad) should allow you to select all
> your
> curves, then create a skin that fits prefectly over the curves.
> You'll
> probably find that you have to edit the curves a few times before it
> starts looking correct.
>
> But that's pretty much it. Not too different from the join the
> dots,
> only with curves.... ;-)
>
> If your doing solid modelling, then hopefully there is tool for
> giving
> the skin 'thickness' or volume. Otherwise you might have to create
> a
> copy of the hull and shrink it down by a very very small amount and
> put
> it inside the bigger hull skin, then joint the two object together.
> The
> distance between the inner and outer skin determines how thick the
> hull
> will be.
>
> This is how I would tackle the problem, but it's probably worth
> noting
> that the software I use to do this type of thing isn't a true solid
> modeller.
>
> Hope this helps.
>
> Ian.
>
>
>
> On Fri, 18 Jun 2004 08:36:12 +1000 (GMT+10:00)
> Peter McKellar <submckellar@earthlink.net> wrote:
>
> > Hi All,
> >
> > I am trying to reverse engineer a boat hull for my pressure hull's
> exo-skeleton.
> >
> > I am using autocad 2004 and solid modelling, but i just can't
> split the shape into the primitives i need to draw it (in my head
> anyway). I am also trying to scale it down (and this has its own
> pitfalls as it may not scale and retain its properties).
> >
> > I have a jpg of it, including cross sections both horizontally and
> vertically at a number of points. I am considering pasting these
> planar jpgs into the drawing and then doing a 3d join-the-dots.
> >
> > can anyone think of a better solution?
> >
> > cheers
> > peter
> >
> >
> >
> >
> >
>
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