Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Conditional lines on sloped wedge parts 43720 and 43721
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Wed, 22 Sep 2010 03:37:20 GMT
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Viewed:
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21392 times
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In lugnet.cad.dat.parts, Lars C. Hassing wrote:
> > > I have made a 43720.inc for the test of the coming L3PPARTS.
> > > The mathematical description of the surface is:
> > > 80x + 40y + yz = 0
> > > and I have used the POV primitive quadric:
> > > quadric {
> > > <0,0,0>, <0,0,1>, <80,40,0>, 0
> > > clipped_by { box { <-20,0,-40>, <0,20,40> } }
> > > }
> >
> >
> > Looks good.
> > Should we create a new primitive with the next dimensions:?
> > 2 24 0 0 1 0 1 1
> > 2 24 1 0 -1 0 1 -1
> > 2 24 0 0 1 1 0 -1
> > 2 24 0 1 1 0 1 -1
> > and a POV-quadric version in the coming L3PPARTS.
> >
> > As the outer twisted surface of the parts with this shape are
> > pretty the same size, the inner surface differs among these parts
> > (in 43720/43721 the inner surface has a z-size of 72,
> > in 45407 the inner suface has a z-size of 76).
> > With a general primitive it can be stretched to any dimension.
>
> Good idea with a twist primitive (twist.dat ?).
> Perhaps it would be simpler if it were only in one octant:
> 2 24 0 0 0 0 0 1
> 2 24 0 0 1 1 1 1
> 2 24 1 1 1 0 1 0
> 2 24 0 1 0 0 0 0
> POV code would be:
> //x - yz = 0
> quadric {
> <0,0,0>, <0,0,-1>, <1,0,0>, 0
> clipped_by { box { <0,0,0>, <1,1,1> } }
> }
> /Lars
Ok so it's been a few years, but I took another look at this.
Did anybody ever make a twist primitive? It appears like all
you need to do is something like this.
Don
0 Wedge 4 x 2 Sloped Left
0 Name: 43721.dat
0 Author: Donald Sutter
0 LDRAW_ORG Part UPDATE 2004-04
0 Unofficial hack for testing purposes.
0
1 16 0 0 0 -1 0 0 0 1 0 0 0 1 s\43720s01.dat
0
1 16 -10 0 30 0 0 1 0 1 0 -1 0 0 stud.dat
1 16 -10 0 10 0 0 1 0 1 0 -1 0 0 stud.dat
1 16 -10 0 -10 0 0 1 0 1 0 -1 0 0 stud.dat
1 16 -10 0 -30 0 0 1 0 1 0 -1 0 0 stud.dat
0
0 // Begin 4 quadrant twist patch.
0 // Is each quadrant actually the same part?
0 // Scale down to 1x1 for reuse in other parts.
0 // Can break each quadrant into 4 parts for
0 // an even finer mesh.
3 16 11.25 15 20 5 10 0 10 20 0
3 16 11.25 15 20 10 20 0 20 20 40
3 16 11.25 15 20 20 20 40 10 10 40
3 16 11.25 15 20 10 10 40 5 10 0
0
3 16 3.75 5 20 0 0 0 5 10 0
3 16 3.75 5 20 5 10 0 10 10 40
3 16 3.75 5 20 10 10 40 0 0 40
3 16 3.75 5 20 0 0 40 0 0 0
0
3 16 1.25 5 -20 0 0 -40 0 10 -40
3 16 1.25 5 -20 0 10 -40 5 10 0
3 16 1.25 5 -20 5 10 0 0 0 0
3 16 1.25 5 -20 0 0 0 0 0 -40
0
3 16 3.75 15 -20 0 10 -40 0 20 -40
3 16 3.75 15 -20 0 20 -40 10 20 0
3 16 3.75 15 -20 10 20 0 5 10 0
3 16 3.75 15 -20 5 10 0 0 10 -40
0 // End 4 quadrant twist patch.
0
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