Subject:
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Re: Problem with Primitive Generator
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 29 Jan 2008 06:11:00 GMT
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Viewed:
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3719 times
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In lugnet.cad, Philippe Hurbain wrote:
> > I think a solution that mostly works was invented around this
> > time frame:
> >
> > http://news.lugnet.com/cad/dat/parts/?n=3375
> >
> > Instead of using cylinder primitives with an optional line at one end
> > that expects to be mated with a similar cylinder primitive, you use
> > optional lines at both ends that share the work by dividing the curve
> > angle in half. This puts the optional line control points on the
> > tangent plane, which allows you to mate a cylinder primitive with
> > another cylinder or with a quad in the tangent plane.
> Yes, that's the way cylinder primitives are done, and it seems to work very
> well. I think other primitives could be improved that way.
>
> > But it doesn't
> > work for S curves made of two cylinder primitives mated in the
> > opposite direction.
>
> That case is not that bad - the angle where the middle line appears is divided
> by two, so it is an improvement. Moreover the line is better accepted in that
> case since the surface is locally tangent to the eye direction.
>
> > I don't think this was ever implemented for cylinders, but it might
> > have made it into some of the sphere primitives. More info here,
> > with pictures and some discussion of the primitive generator.
> >
> > http://news.lugnet.com/cad/dat/parts/primitives/?n=350&t=i&v=a
>
> This thread perfectly describes the problem. Unfortunately Paul didn't update
> PrimGen...
>
> Philo
I believe this was corrected back in November of 2003. There have been other
updates to PrimGen since then.
Look under options, 'original style cyli and cones'.
I do not recall a discussion where it was ever decided to change to the "newer"
configuration so I set the option 'on' at start. (it does not save this setting)
Cheers,
Paul Easter
http://www.geocities.com/pneaster/prim-gen.htm
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Message has 2 Replies:
 | | Re: Problem with Primitive Generator
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| Paul, (...) Shame on me for these words! I should wear better glasses. (...) Thanks a lot, Paul. Indeed it solves that issue. The official cylinder primitives are now new style so I guess the option could be set to off now (though most cone (...) (17 years ago, 29-Jan-08, to lugnet.cad)
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Message is in Reply To:
| | Re: Problem with Primitive Generator
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| (...) Yes, that's the way cylinder primitives are done, and it seems to work very well. I think other primitives could be improved that way. (...) That case is not that bad - the angle where the middle line appears is divided by two, so it is an (...) (17 years ago, 26-Sep-07, to lugnet.cad)
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