CAD file format specifications?
anthra.norell at bluewin.ch
Thu Jun 18 07:39:28 EDT 2009
> Anthra Norell wrote:
>> Andres Acosta wrote:
>>> HI there Anthara have you checked out www.Blender.org, It is open
>>> source and accepts a lot of your formats. for import and export.
>>> Anthra Norell wrote:
>>>> Anyone working with CAD who knows about numeric data entry? I
>>>> have 3d coordinates of a construction site on a slope (borders,
>>>> setbacks and isometric elevation lines). Someone made me aware of
>>>> Google's Sketch Up. It looks very attractive for the purpose of
>>>> architectural planning, especially suited to create visual
>>>> impressions. Doodling seems easy. But I have to start with modeling
>>>> the terrain and the envelope and the only way to do that seems to
>>>> be in one of several CAD file formats (skp, dwg, dxf, 3ds, ddf and
>>>> dem). So I need to cast my numbers into one of these formats. Any
>> Thanks for the tip. I wasn't aware of Blender. The web page looks
>> promising. I downloaded it and am going to have a look at it.
> Could you be a little more specific about your data's current
> format and the format that seems to best suit your needs?
> Tabular source data and dxf output files for use in CAD are quite
> simple to write. But this assumes dxf suits your display program's
> I think, for display purposes, Microsoft Word still accepts dxf files.
> I run unix mostly and I don't keep up with Window$. ;(
> I suggest you Google for CAD (Computer Aided Drafting) programs. There
> are free ones out there. Most will take the DXF format. If the
> contours are pre-traced you can polyline them to make the contours
> look correct. If the 3D points are X-section or random you will need a
> contour generating program.... and so it goes.
> Let's start here - what is your area of expertise, how much math in
> your background, why are you attempting this exercise?
> In order to communicate properly I need to know. I can tailor my
> comments to suit.
> Steve Turner
> Licensed Land Surveyor CA 5197 (inactive)
> 1st order Photogrammetric Compiler (2D depctions from 3D photo sets)
> in short Map Maker, Master Grade
> norseman at hughes.net
Thank you for your support. In a nutshell: I have a patch of
constructible land and have the coordinates of its borders and a few
other parameters. The patch is on a slope, so I had a surveyor do the
isometric elevation lines. That's a lot more coordinates. The
coordinates are plain text. Plain text is a breeze to convert into
Python sequences. So I made a bitmap of the ground plan with the
elevation lines as a template to play around doing architecture. A
ground plan is 2d and as such is rather ill-suited to conceptualize the
vertical dimension. Then someone made me aware of Google Sketch Up. It
looks sort of like MS Paint in three dimensions: intuitive for doodling.
Before I waste time doodling a flying or a subterranean house I want to
make a three-dimensional template of the terrain and the constructible
volume. The way to import numeric data, for what I see, is as one of the
following CAD-file formats: skp, dwg, dxf, 3ds, ddf or dem. So I need to
convert my coordinates into one of them, preferably the
conversion-friendliest, but I don't have the specifications of any one.
I had a look at Blender. It looks impressive too. It might be an
alternative to Sketch Up. I'll worry about that later. My immediate need
is a file conversion utility. A cursory inspection of Blender's menu
tabs and the various help options didn't turn up a file-conversion
utility. So, my question is: How do I convert a bunch of
three-dimensional coordinates defining lines into a file format Sketch
Up can read (skp, dwg, dxf, 3ds, ddf or dem)?
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