Subject:
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Re: DAT to DXF again
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 7 Oct 2002 21:23:15 GMT
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Viewed:
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647 times
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In lugnet.cad.dev, Don Heyse writes:
> Personally, I wish someone would follow the directions on this page to
> create a 2x2 brick in autocad and then make it into an AutoCAD block.
>
> http://homepage.dtn.ntl.com/terry.rawkins/acad/solids/lego.htm
>
> Then export the block as a DXF and post it to lugnet so we can see
> what the DXF file contains. Finally build a little wall with 2 or 3
> bricks and export that as a DXF file so we can see how DXF uses the
> blocks in a file to build something. It's one thing to read some DXF
> specs, but a real world example is so much easier to take apart and
> understand.
I would like to discuss this because I'm not sure that would be the best
path to follow. Translating (AutoCad) volume models into (Ldraw) face models
could proove to be difficult. Maybe you're better off to build the Autocad
model with faces also, and make a set of AutoCad Blocks that have a 1 on 1
relationship with Ldraw Primitives, preferably with identical names. Just
like Primitives, AutoCad Blocks can be scaled along all three axels
indepenently and rotated in any direction. In Autocad the orientation of a
block in space is described with a origin point and a normal vector, so I
guess you could calculate a complete Ldraw matix from those two components.
Also, when you are coverting the other way round (from Ldraw to AutoCad) it
would store all repeating elements as AutoCad blocks, in a more efficient
way than in a volume model generation tree. A volume model generation tree
has a limited depth (I still have to look up how much branches).
With friendly greetings, M. Moolhuysen.
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Message has 1 Reply:
 | | Re: DAT to DXF again
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| (...) Can you make an AutoCAD block out of more primitive AutoCAD blocks? I don't know. That's why I'd like see some simple examples exported to DXF from AutoCAD. I don't really care whether an AutoCAD version of the parts uses volumes or faces, (...) (22 years ago, 7-Oct-02, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: DAT to DXF again
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| (...) You're not the only one who wants that. See here: (URL) we have a few utilities, but no comprehensive system that I know of which could be used to design models in AutoCAD. There are programs that seem geared to creating parts in AutoCAD and (...) (22 years ago, 7-Oct-02, to lugnet.cad.dev)
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