Subject:
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Re: Primitives to Hi-Res or not...
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 25 Jan 2000 14:14:50 GMT
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Viewed:
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603 times
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In lugnet.cad.dev, Imre Papp writes:
[snip]
> Further we might need even higher resolution primitives (96?, 120?) if we
> start modelling curved train tracks or road patterned baseplates. ( I remember
> that somebody had problems with that.)
[snip]
One note about those curved tracks:
Because of part details, circular primitives can't be used efficiently for
modelling curved tracks. I refer to the tapering at both ends and the saw-
theeth top of the oudside curve that one encounters with the old style
4.5V/12V track, and also to the gaps and partly tilted sides that are a
property of the new 9V track. Primitives with poligon sides based on a regular
subdevision of a (full) circle are simply "out of phase" with the dimensions
of teeth, tapered ends and gaps.
If you feel you don't agree with me, FCTT ! (First Count Those Teeth)
Currendly I've submitted 3 curved track parts, defined with faces, lines,
optional lines, and only a few bottom stud primitives. I've based the poligon
lentgth on the dimension of a row with 3 top-teeth, so this group of teeth and
the poligon side have the same "wavelength" and their endpoints in common.
I've calculated the poligon faces with a custom build Autolisp program, a
language belonging to the CAD program I use at work.
I expect the track parts will be in the upcomming vote. I'm still working on
#3230b, being the slotted version of the 4,5V/12V inside curve.
Ofcourse, Hi-Res primitives will still be needed in other cases.
Greetings, M. Moolhuysen.
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Message is in Reply To:
 | | Re: Primitives to Hi-Res or not...
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| (...) My opinion is that we do need high res circular primitives (edge, disc, cyli, etc) in cases where the part includes curves/surfaces with a significantly larger diameter than 'usual'. The good old STUD.dat (and its familiy) looks OK with 16 (...) (25 years ago, 25-Jan-00, to lugnet.cad.dev)
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