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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Mon, 25 Apr 2005 14:52:13 GMT
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Viewed:
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4438 times
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In lugnet.cad.dat.parts, Niels Karsdorp wrote:
> In lugnet.cad.dat.parts, Lars C. Hassing wrote:
> > In lugnet.cad.dat.parts, Steve Bliss wrote:
> > > I'm pretty sure that's going to be the problem with *any* partition
> > > of this surface into polygons. Having a mathematical description
> > > of the surface would be good, because then we could potentially
> > > create a primitive for the surface, and rendering programs could
> > > substitute a smooth-curve construct for the primitive.
> >
> > 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.
Nice, I like the idea of the quadric primitive, but we want to
add some curvature to the LDRAW version, right? I fiddled a bit
with the part a few days ago, starting with the two triangles
outlined by your primitive. I didn't exactly finish, but I think
if you take this and make a surface that follows the green X and
also follows the red stripes, you end up with something pretty
decent where the optional lines work.
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 -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
2 4 5 20 -20 0 0 -20
2 4 10 20 0 0 0 0
2 4 15 20 20 0 0 20
0
2 2 0 20 -40 3.75 15 -20
2 2 3.75 15 -20 5 10 0
2 2 5 10 0 3.75 5 20
2 2 3.75 5 20 0 0 40
0
2 2 0 0 -40 1.25 5 -20
2 2 1.25 5 -20 5 10 0
2 2 5 10 0 11.25 15 20
2 2 11.25 15 20 20 20 40
0
3 46 0 0 -40 0 20 -40 3.75 15 -20
3 46 0 0 -40 3.75 15 -20 5 10 0
3 46 0 0 -40 5 10 0 3.75 5 20
3 46 0 0 -40 3.75 5 20 0 0 40
0
3 45 20 20 40 0 20 -40 3.75 15 -20
3 45 20 20 40 3.75 15 -20 5 10 0
3 45 20 20 40 5 10 0 3.75 5 20
3 45 20 20 40 3.75 5 20 0 0 40
0
1 16 0 0 0 -1 0 0 0 1 0 0 0 1 s\43720s01.dat
0
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