Subject:
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Re: part 2951, more questions, nearly done
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 13 Jan 2000 11:36:03 GMT
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Viewed:
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506 times
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"John Jensen" <skurt@vip.cybercity.dk> writes:
> In case this is legal (see below) I'll let a 1-4cyli connect to the
> back flat part and a 1-8 cyli connect to the front flat part and
> connect the two cylinders with a polygon. That way I don't have to
> redo that much:)
I think that would be perfectly ok. At least as long as you do the
same thing with discs that connect to either end of the cylinder. (I
hope you understand what I mean by this. If not, ask more!)
Of course, with this approach, there may be a problem with the
conditional 5-type lines, because you need to add one manually where
you add the polygon. This is a bit involved to explain, but I would
recommend that you look at the 1-8cyli primitive to see how the type-5
lines are used. Ask us more questions (or look in the FAQ if you
don't know what type-5 lines are). (Preferably the last :-)
> After seeing this post (something about parts creating) I have a few
> questions: What exactly is a large cylinder? The cylinders I'm
> working with here are about 40 LDu's in radius.
There is a recent addition to the LDraw parts library, the 4x4
circular cylinder brick with centre cross axle hole and side peg
holes. (Sorry, I don't have the number.) This has a 40 LDU
radius, and I believe it uses the 16 sided primitives. (But check for
yourself, 'cause I don't know for sure.)
> After looking at Glöckner's renderings of his sketch, the round
> parts looks very round, does POVRay render theese 16agons as
> circles?
Yes, this is why you should use circular primitives where possible:
They get transformed to real circular shapes. There are other reasons
as well, but in general, circular primitives should be used where
possible.
> If I'm about to do my own cylinder with, say, 32 faces (I'll only do
> 1/4 or 1/8 of them) is it then possible to create a sort of personal
> primitive, that can be used in parts aspiring to be made official?
I don't think you should do that. There does exist high res 48 edged
primitives, which you can use if you have to. I believe they are
under ldraw/p/48/.
> I'm later planning on doing an even bigger bucket (the one from set
> 8459, does anyone know the part number for this one?), so it would
> be quite useful to have such a "high-res" cylinder for later
> use. Unless, ofcourse, that it doesn't make any difference.
Wow! The bucket from 8459 would be great! (Dunno about your
question, though, so I'll leave that for the rest to answer.)
Fredrik
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Message is in Reply To:
 | | Re: part 2951, more questions, nearly done
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| (...) (I corrected the above from 2-4cyli to 1-4 cyli:)) (...) In case this is legal (see below) I'll let a 1-4cyli connect to the back flat part and a 1-8 cyli connect to the front flat part and connect the two cylinders with a polygon. That way I (...) (25 years ago, 13-Jan-00, to lugnet.cad.dev)
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