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 CAD / LDraw Files / Parts / Primitives / *409 (-20)
  CCW vs CW
 
The (URL) Language Extension for Clipping (BFC)> states in the Parts Library Guidelines section that Primitives should always use CCW winding. However some of the primitives use CW, for example (URL) rect.dat>. Should these be rewritten? Would it be (...) (19 years ago, 12-May-05, to lugnet.cad.dat.parts.primitives, FTX)
 
  Re: stud3 -- hollow vs filled
 
(...) Since this question crops up at regular intervals, I've added an explanatory note to the Primitives Reference : (URL) Chris (20 years ago, 23-Dec-04, to lugnet.cad.dat.parts.primitives)
 
  Re: stud3 -- hollow vs filled
 
(...) Note that FWIW, BrickLink and Peeron and other inventory resources tend not to get to this level of detail either, they typically do not differentiate this. (20 years ago, 23-Dec-04, to lugnet.cad.dat.parts.primitives)
 
  Re: stud3 -- hollow vs filled
 
(...) Hello, James! [snip description of situation leading up to the question] (...) The standard in the LDraw library is to use stud3.dat for all stud3-type anti-studs, regardless of whether they are actually hollow or solid. The reason is that (...) (20 years ago, 23-Dec-04, to lugnet.cad.dat.parts.primitives)
 
  stud3 -- hollow vs filled
 
Hello, everyone. When I was working on 71427 (expect a post on l.c.d.parts soon), I noticed that the two small underside studs were modeled with a pair of cyli4-4s and a disk1. When looking for the proper primitive to replace that with, I noticed (...) (20 years ago, 23-Dec-04, to lugnet.cad.dat.parts.primitives, FTX)
 
  Re: N-Fedge primitives
 
(...) I missed responding to this one specific point. In general, aliases amongst the primitives would be a bad thing. They would primarily add more files to an already too-large list of primitives, and would only provide duplicate function. In this (...) (20 years ago, 9-Dec-04, to lugnet.cad.dat.parts.primitives, FTX)
 
  Re: N-Fedge primitives
 
(...) The consistency is in the basic four fractions: 1-4, 2-4, 3-4, 4-4. The other measures are (more or less) deliberate inconsistencies to name files that don't fit the basic standard. (...) Yes, that would be an incorrect consideration. Part (...) (20 years ago, 9-Dec-04, to lugnet.cad.dat.parts.primitives, FTX)
 
  Re: N-Fedge primitives
 
(...) It's not really that hard, but my mind recoils at a senseless inconsistency, and this, and the following, are it. Note that I suggested an alias, not move, and certainly not removing the existing names. (...) "0 Circle 1.0". 5-8edge should be (...) (20 years ago, 9-Dec-04, to lugnet.cad.dat.parts.primitives, FTX)
 
  Re: N-Fedge primitives
 
(...) Great - we are always looking for constructive help. (...) I don't see the benefit from this - the naming convention is well established and existing part authors know how to work with it. Is it that hard to learn? (...) Yes - as I have (...) (20 years ago, 8-Dec-04, to lugnet.cad.dat.parts.primitives)
 
  N-Fedge primitives
 
Hello, everyone. This was posted with NNTP, but seems to have dissappeared somehow, so I'm re-posting with the http interface. My appolgies if it turns up twice. I'm just getting started with LDraw, and returning to the lego-driven days of my youth, (...) (20 years ago, 8-Dec-04, to lugnet.cad.dat.parts.primitives)
 
  Re: cylinders missing conditional lines?
 
(...) I don't get that last thing with tangent lines (probably because english is not my native language). At the moment the official library contains 25 partial cylinder and cone primitives, out of which 21 have conditional lines at both ends and 4 (...) (20 years ago, 4-Nov-04, to lugnet.cad.dat.parts.primitives)
 
  Re: cylinders missing conditional lines?
 
(...) Actually, if you use conditional lines that follow the red tangent lines, as in Travis' diagram, then you want them to overlap. You get partial coverage from each of them that adds up to the total coverage you'd get from the original style of (...) (20 years ago, 4-Nov-04, to lugnet.cad.dat.parts.primitives)
 
  Re: cylinders missing conditional lines?
 
(...) I checked a few official parts that use the 2-4cyli primitive. And all the parts I have checked so far are missing the conditional line at one end of the cylinder. So I suspect that part authors expect that all partial cylinder primitives have (...) (20 years ago, 4-Nov-04, to lugnet.cad.dat.parts.primitives)
 
  Re: cylinders missing conditional lines?
 
(...) This thread pops up from time to time and never seems to get resolved. (URL) think the problem is this: If you fix the all the primitives, then you really must check all the parts that use them. So we end up ignoring it and moving on. If (...) (20 years ago, 4-Nov-04, to lugnet.cad.dat.parts.primitives)
 
  cylinders missing conditional lines?
 
When using the 2-4cyli primitive I noticed one conditional line missing, so I compared all different cyli primitives. Some have conditional lines at both ends, some have not. 1-4cyli: conditional lines at both ends 1-8cyli: conditional line at one (...) (20 years ago, 4-Nov-04, to lugnet.cad.dat.parts.primitives)
 
  Re: "Clusters" of Studs?
 
(...) Yeah, they'd be just the studs. (...) I'm not opposed to that; I don't see a compelling choice between stug* and stus*. Because I had files that used them, I went ahead and submitted stug3, stug4, stug6 and stug8 to the PT. If people want (...) (20 years ago, 26-Oct-04, to lugnet.cad.dat.parts.primitives)
 
  Re: "Clusters" of Studs?
 
(...) Just to clarify, would these include the surface between the studs, or just the studs? I think logically they should include just the studs but just wanted to make sure. (...) Maybe, if that is a future possibility, the square ones should be (...) (20 years ago, 25-Oct-04, to lugnet.cad.dat.parts.primitives)
 
  Re: "Clusters" of Studs?
 
(...) ... Whoops; you're right. --Travis (20 years ago, 25-Oct-04, to lugnet.cad.dat.parts.primitives)
 
  Re: "Clusters" of Studs?
 
(...) From the way Steve explained it, it sounds like stug4 would be a 4x4 square, not a 2x2 square, in which case going from stugN to stugN+1 actually does give you another 2N+1 studs. When you think about it, by your reasoning, you'd never (...) (20 years ago, 25-Oct-04, to lugnet.cad.dat.parts.primitives)
 
  Re: "Clusters" of Studs?
 
Since I haven't authored any parts, I'm not going to go into this too deeply, but I think that square groups is a good idea. One minor note. Going from one group size to the next gives you 2 * sqrt(N) + 1 new studs, not 2N + 1. --Travis (20 years ago, 25-Oct-04, to lugnet.cad.dat.parts.primitives)


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