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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Tue, 26 Apr 2005 13:14:48 GMT
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Viewed:
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18528 times
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In lugnet.cad.dat.parts, Travis Cobbs wrote:
> In lugnet.cad.dat.parts, Don Heyse wrote:
> > 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.
>
> The following are the appropriate conditionals for Don's surface.
> Playing with it you can have angles where the conditionals seem to
> go too far, but it's certainly much better than the current ones.
Hey, thanks testing it out. You're right about the conditionals
zig-zagging a bit. I still have the feeling that if the surface
were pinned down to the concave green line those zig-zags would
go away. But I couldn't decide whether to divvy it up with cuts
sorta parallel to the convex green line (like the torus primitives)
or with another fan outta one (or two) of the other corners. I
was kinda hoping that maybe with your superior math intuition, you'd
just know the right answer... ;^)
> (Note that the last 4 conditionals are only there to keep the surface
> smooth in LDView. I'm not sure if that's appropriate or not, but it
> looks a whole lot better in LDView with them present. It looks
> positively wretched without them.)
I'd keep 'em for now. But maybe this weekend I'll try and scale it
down to the 1x1x1 primitive size and pin the surfaces down to that
concave curve. Then it'll need a whole new set of conditionals.
Don
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