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Re: [PSUBS-MAILIST] Reverse engineering in CAD
Hi Steve et al,
yes, this is exactly what i was planning to do. I have run the jpeg thru adobe and scaled it 1:100 pixel/metre.
I then set up layers and play with the ucs coordinates. I have now put the 2D jpeg in the suitable planes, a bit like the support/ribs within a boat. I have one running down the centre like the lowest point of a boat. another jpeg is up at about midpoint and is oriented so you could walk on it like a deck. I now have to insert a jpeg cross-section to give it depth in the Z axis.
I will then create another layer, and as you mentioned, will then use polylines or something to join the dots in 3D. This may deliver me the shape i want, but it doesnt address the issue of reproducing it. i will play with autocad a little more - i should be able to extract point data from the generated objects <just thinking out loud here haha>
i am still thinking of using really basic primitives - boxes, cylinders etc and work on making it accurate later.
thx
peter
-----Original Message-----
From: Steven Mills <cirtemoeg@juno.com>
Sent: Jun 18, 2004 4:38 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Reverse engineering in CAD
I don't have Autocad 2004 since I have kept up with the updates.
[ plus the $$$ ] I'm still working with 12 and 13..
I also tend to do things the long tedious way. I would create a layer
[ say 3? give it a label of course ] import the jpg and then vector
or trace over it on another layer [ 2? ] with your sectionals and
diagonal plan form. I suppose you could use polylines to begin
with and modify later. You're basically ending up with a dwg file
then work your way up. For nurbs, you may have to go Autocad
Inventor or Rhino. But, you don't have to! Autocad does a decent
solid model.
Hopefully, someone here can come up with a better solution.
--Steve
On Fri, 18 Jun 2004 08:36:12 +1000 (GMT+10:00) Peter McKellar
<submckellar@earthlink.net> writes:
> 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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