Subject:
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Re: Question about generating curves
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 10 Jan 2001 04:45:22 GMT
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Viewed:
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417 times
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In lugnet.cad.dat.parts, Franklin W. Cain writes:
<snip>
> Now, with regards to "conditional" (i.e., type-"5") lines,
> think about the 3-D ramifications of using multi-angled planes
> to simulate a curved plane (the 3-D extrapolation of the 2-D
> principle of using angles for curves mentioned above).
> A "true" curved plane doesn't really have "edges"
> (with regards to its curvature, that is), but when using
> these angled planes, sometimes one of the folds of the angled plane
> will also be an edge of the model/shape itself.
> For example, imagine the ubiquitous D20, a 20-sided die.
> Let's pretend we're using this to _simulate_ a sphere.
> A true sphere has a circular "edge" line (which we could call
> a horizon, perhaps), but the d20 does not have a nice, neat
> circular border, does it? Depending on which two points
> you're holding it by, and which face(s) are pointing towards you,
> that determines which of the actual edge-lines would need
> to be drawn in order to simulate our horizon.
> Does this help any?
<snip>
> Franklin
Franklin,
Your quite a humorus man. What the hell did you just say! Please allow
me to explain why I'm laughing. I didn't graduate high school, I don't have
a GED but even with an IQ of 168, I still don't know how to use the
conditional line.
I fully understand the concept of using large amounts of small lines to
simulate a curve. I can do that using a bunch of regular lines. How is the
conditional line special? I've noticed there are two lines. One is the
color I select and the other is a dark pink. If I move the primary line as a
whole, the secondary line stays stationary. If I rotate the line, they both
rotate.
I haven't picked apart any other parts, subparts, or primitives. Is
there any that I could use as an example?
Joe
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Message has 1 Reply:
 | | Re: Question about generating curves
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| "Joseph Cardana" <jcardanas@home.com> wrote in message news:G6xJvM.JIv@lugnet.com... (...) allow (...) have (...) to (...) the (...) Conditional lines are used to show the outer boundary of a curved _surface_. Consider a cylinder. Between each quad (...) (24 years ago, 10-Jan-01, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Question about generating curves
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| (Note: Please follow-up to ".cad.dev".) (...) OK, first you need to bear in mind that LDraw does _NOT_ draw true curves, it draws _angles_. If you have enough angles in a line, from a sufficient distance, this angled line will _appear_ to be a true (...) (24 years ago, 10-Jan-01, to lugnet.cad.dat.parts, lugnet.cad.dev)
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