Subject:
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Re: LDDP current version - BUG?
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Newsgroups:
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lugnet.cad
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Date:
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Sun, 31 May 2009 21:37:12 GMT
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Viewed:
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14776 times
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In lugnet.cad, Orion Pobursky wrote:
> In lugnet.cad, Michael Heidemann wrote:
> > In lugnet.cad, Orion Pobursky wrote:
> > > In lugnet.cad, Michael Heidemann wrote:
> > > > I just came across the following problem.
> > > > For part http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/3069bpb1.dat LDDP
> > > > generate 2 error regarding planarity.
> > > > Planarcheck does not.
> > > >
> > > > Anybody with similar experience?
> > >
> > > I just checked this part. The 2 lines in question look to be concave in LDView.
> > >
> > > -Orion
> >
> > I just checked an LDView reports concave quads. Can somebody explain that to me,
> > as I believed it can be checked with planarcheck, but co-planarity is ok.
>
> Concave is not the same as co-planer. Co-planarity checks to see if all the
> points in the quad lie on the same plane (with in some tolerance). You can have
> a co-planer, concave quad.
>
> > One other thing.
> > At part http://www.ldraw.org/cgi-bin/ptdetail.cgi?f=parts/s/2859s01.dat LDDP
> > does not find any double lines. But there are double lines.
> > 2 24 155.00 -5.50 -41.00 155.00 -5.50 -27.00
> > 2 24 155.00 -5.50 -27.00 155.00 -5.50 -41.00
> > These two lines seems to me identical.
> > Also LDView does not report them!
>
> Those are illegal type 2 lines as they have 3 points defined instead of 2.
> Right now, LDDP just ignores illegal lines and doesn't complain about them.
>
> -Orion
I don't think so, as the official document
(http://www.ldraw.org/Article218.html#lt2) reads like this:
Line Type 2
Line type 2 is a line drawn between two points. The generic format is:
2 <colour> x1 y1 z1 x2 y2 z2
Where:
* <colour> is a number representing the colour of the part, typically this
is 24 - the edge colour. See the Colours section for allowable colour numbers.
* x1 y1 z1 is the coordinate of the first point
* x2 y2 z2 is the coordinate of the second point
What is illegal to the above mentioned lines??
I need for one point in 3D three values for x,y and z.
I am sorry, but this is a bug in LDDP!!
cu
mikeheide
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Message has 1 Reply:
Message is in Reply To:
 | | Re: LDDP current version - BUG?
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| (...) Concave is not the same as co-planer. Co-planarity checks to see if all the points in the quad lie on the same plane (with in some tolerance). You can have a co-planer, concave quad. (...) Those are illegal type 2 lines as they have 3 points (...) (17 years ago, 31-May-09, to lugnet.cad)
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