[cad-linux-dev] Re: spec
- From: Chris Somerlot <csomerlot@xxxxxxxxx>
- To: Jim parker <jparker@xxxxxxxxxxxx>, cad-linux-dev@xxxxxxxxxxxxx
- Date: Wed, 25 Aug 2004 16:03:35 -0400
Is gtkCAD available? It seems its sourceforge page is down.
On Wed, 25 Aug 2004 15:56:19 -0400, Jim parker <jparker@xxxxxxxxxxxx> wrote:
> In GtkCAD, I have a global coordinate system for the complete model,
> then each part has a local coordinate system. Entities default to the
> current parts local coordinate system (At this stage of the game, the
> local and global coordinate systems are often the same).
>
> Entities do not have coordinate systems associated with them. Entities
> that need orientation information use normal vectors. Like Acad, they
> are normally drawn in the current plane, unless changed by the user.
> This might be limiting with respect to parametric modeling, but ...
>
> The goal here is to build parts individually, then assembly them into
> the model. This would be the equivalent of drawing in Acad with blocks
> from a part library. It also has the benefit of locating each part
> using parametric relations between the coordinate systems.
>
> cheers,
>
> H. James Parker
> Naval Architect
> Gibbs and Cox, Inc.
> office) 703-416-3625
> fax) 703-416-3679
> jparker@xxxxxxxxxxxx
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> >>> Chris Somerlot <csomerlot@xxxxxxxxx> 8/25/2004 3:15:30 PM >>>
> On Wed, 25 Aug 2004 14:13:28 -0400, Jim parker <jparker@xxxxxxxxxxxx>
> wrote:
> > As it currently stands ARCS and CIRCLES are not fully described.
> You
> > need at minimum a normal vector to define the orientation of the face
> in
> > 3-D space.
> >
> Yes, actually this brings up a whole other entity that I'm missing:
> coordinate systems. In acad circles are always drawn in the plane of a
> particular UCS. I'm wondering if I should just give a vector attribute
> to circles and arcs, or give every geometric entity a coordsys
> attribute and have the coordinate system defined as a separate entity,
> like layers. Listers?
>
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