LEGO Elements/Parts : 5663


CAD / LDraw Files / Parts / 5663	5662 \| 5664

Special:	[DAT] (requires LDraw-compatible viewer)
Subject:	Re: Conditional lines on sloped wedge parts 43720 and 43721
Newsgroups:	lugnet.cad.dat.parts
Date:	Mon, 25 Apr 2005 08:05:32 GMT
Viewed:	4830 times

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. Niels Karsdorp

Message has 2 Replies:

		Re: Conditional lines on sloped wedge parts 43720 and 43721 [DAT]
(...) 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, (...) (20 years ago, 25-Apr-05, to lugnet.cad.dat.parts)

		Re: Conditional lines on sloped wedge parts 43720 and 43721 [DAT]
(...) 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>, (...) (20 years ago, 27-Apr-05, to lugnet.cad.dat.parts)

Message is in Reply To:

		Re: Conditional lines on sloped wedge parts 43720 and 43721
(...) 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>, (...) (20 years ago, 25-Apr-05, to lugnet.cad.dat.parts)

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