Subject:
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Re: 6056 - Brick 2 x 2 x 6 with Groove
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Thu, 5 Aug 1999 04:19:58 GMT
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Viewed:
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989 times
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Jeff Stembel <Dragonelf1@aol.com> wrote in message
news:FFy9q9.AJF@lugnet.com...
> In lugnet.cad.dat.parts, Steve Bliss writes:
> > On Wed, 4 Aug 1999 13:02:26 GMT, "Jeff Stembel" <Dragonelf1@aol.com> • wrote:
> >
> > > This is my second part, the 2x2x6 Brick with groove.
> > > One thing I didn't model on this part was the small hole in the bottom
> > > half-stud. Is this okay, or should it be there?
> >
> > I haven't looked at the part yet, if you mean one of those • underside-studs,
> > such as are found in 1x plates, the hole doesn't need to be there. And • if
> > you didn't use the appropriate stud primitive for that part of the part,
> > you should have.
>
> Good. A stud primitive wouldn't work there because it is only half a • stud. If
> you get a chance to render it, you'll see what I mean. You can also look • at
> part 4216, as it has the same underside.
I think you should put the hole in. I was going to start work on this after
working on another part and I had already taken the measurements for it.
Eventhough the hole is in the bottom and you can't imagine anyone ever
wanting to stick something in it, there are several pieces that could fit
within this hole (three of them are the helmet plumes, and I'm sure there
are other parts with that diameter.) If someone wanted they could set this
part up on its side and use the hole as a swivel point for another part (not
that I ever would). I don't know what the convention for this type of thing
has been in the past, but I feel we should duplicate parts as accurately as
possible.
> > CW means clockwise. A quad/triangle is considered CW if the points are
> > specified clockwise, while looking at the shape from the outside. A part
> > is CW-compliant if all its quads/triangles are CW. 'Not CW-compliant'
> > indicates the author is aware that the part is not CW-compliant.
> >
> > Rendering tools can take advantage of CW knowledge to speed up rendering.
> > But they also have to know when CW doesn't apply.
>
> Is it very important that I make it CW-compliant if possible? How do I • Make it
> CW-compliant, anyways?
There was a long discussion about this on LCAD last year. I believe the
consensus then was to start making new parts CW compliant. It takes a bit
more time when authoring the part, mainly because you just can't mirror one
side and use it for the other. You've got to make sure the points go in a
CW order when looking at the face from the outside of the part. I try to
make my parts CW compliant.
One method I have found is once you have one side conforming all you have to
do to make the other side conforming is:
EX.
If the following line is CW on the left side
4 16 x1 y1 z1 x2 y2 z2 x3 y3 z3 x4 y4 z4
then to get the CW right side you would use
4 16 x2 y2 z2 x1 y1 z1 x4 y4 z4 x3 y3 z3
The same can be applied to triangles, just swap the 2's with the 1's and
leave the 3's alone.
Adam
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Message is in Reply To:
 | | Re: 6056 - Brick 2 x 2 x 6 with Groove
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| (...) Good. A stud primitive wouldn't work there because it is only half a stud. If you get a chance to render it, you'll see what I mean. You can also look at part 4216, as it has the same underside. (...) Hmmm... I guess I could go with this then: (...) (25 years ago, 4-Aug-99, to lugnet.cad.dat.parts)
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