Re: [Update REQ 6232]: Geomview

[R.Wardle at sheffield.ac.uk]

Hello,

Thanks for the quick (and comprehensive!) reply. I've got a couple of
further questions.


On Thu, 26 Jun 1997, daemons wrote:

> Date: Thu, 26 Jun 1997 13:41:12 -0500 (CDT)
> From: Stuart Levy <slevy>
> Message-Id: <199706261841.NAA04305 at geom.umn.edu>
> To: software@geom.umn.edu
> Subject: Re:  [ REQ 6232]: Geomview
> 
> Sorry -- there's no really nice way to do edit the properties of a geometric
> primitive (e.g. an OFF object), short of re-sending the entire primitive.
> The replace-geometry command won't do what you'd like here.


Ideas for the next release, perhaps ;)


> 
> However, you can replace portions of a hierarchy, like a member
> of a LIST, or the transformation-matrix or geom object of an INST.
> There are a couple of ways to do this, the easiest one being the use of
> "handles". 
> 
> ... explanation cut ...
> 
> Hope this is a tolerable solution.
> 


Hmm, I can think of a messy way around this that isn't quite what I'd
imagined at first. I suppose another way would be to just draw a new
polygon (face) in exactly the same location as a picked one, in a
different colour (creating two overlapping geoms); or even just use the
existing Nose program and keep drawing little cubes all over the surface
of the model instead of moving the existing geom. The colouring is just to
aid a user in remembering which parts of a model have already been
selected (once satisfied, the user feeds the selected surface spec into an
external program for some analysis).

I've had a look at Crayola, but this seems to use a lot of Geomview
internals and looks to be quite a complicated way of achieving a pretty
simple effect. However, this is along the lines of what I want to do. Is
there any point in trying to figure this out, and if yes, do you make
internals reference material available?

Again, thanks for your time and help.


Regards,
Robin.


--
Robin Wardle <r.wardle at sheffield.ac.uk>
Dynamics Research Group, Department of Mechanical Engineering,
Mappin Building, Mappin Street, University of Sheffield, UK
tel: (0114) 22 27760   ...   fax: (0114) 275 3671