Subject:
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Re: Cone primitives
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 11 May 1999 21:41:26 GMT
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Viewed:
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589 times
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Karim <knassar@mindspring.com> wrote in message
news:3738A084.5D752760@mindspring.com...
> Steve Bliss wrote:
> >
> > On Mon, 10 May 1999 20:30:51 GMT, "John VanZwieten"
> > <john_vanzwieten@email.msn.com> wrote:
> >
> > > I just realized the 1-4con3.dat and 1-4con4.dat don't have optional lines • in
> > > them. Is there a reason for this, or is it just an oversight?
>
> Hmm, I'm using the cone primitives in 30384... How do the cone
> primitives work? The geometry of the canopy doesn't match either the
> con3 or the con4 primitive... right now I am scaling 1-4con4 to create
> part of the half-cone, and then using it again to extend it, but I'm
> afraid it is going to be a Pain to line up the edges. Has anyone else
> run into this problem using the con primitives? What's the best way
> around this? Should I just make my own primitives that match the
> geometry and submit them for voting?
Glad you asked. I just did this for the cone on the SW laser piece. You have
the correct idea, using multiple cone primitives. Remeber it's OK if the cones
overlap as long as they are coincident. Here's an example:
Suppose I need a cone from radius 6 to radius 9.
A con3 X 2 gets me from radius 6 to radius 8, then a con3 X 2.25 gets me from
6.75 to 9, with overlap from 6.75 to 8. This is the same thing you would do
with ring primitives.
Of course with cones you also need to scale the depth of the cones so the slope
of each matches the desired slope of the total cone section. I use Steve
Bliss's interpolation spreadsheet to make this part go much faster.
Hope this makes sense.
-John Van
P.S. I wouldn't mind a few more cone primitives, maybe con2 and con5?
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Message has 1 Reply:
 | | Re: Cone primitives
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| (...) (URL), or go to (URL) and click the link. I don't think I uploaded the version with the cone-sizing page... (...) Especially in 1-4 and 1-8 versions. (25 years ago, 12-May-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Cone primitives
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| (...) Hmm, I'm using the cone primitives in 30384... How do the cone primitives work? The geometry of the canopy doesn't match either the con3 or the con4 primitive... right now I am scaling 1-4con4 to create part of the half-cone, and then using it (...) (25 years ago, 11-May-99, to lugnet.cad.dev)
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