Subject:
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Re: Type-5 conditional edge line
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 3 Apr 2000 13:43:48 GMT
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Viewed:
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5314 times
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Fredrik Glöckner <fredrik.glockner@bio.uio.no> wrote in message
news:m3pus9zd3x.fsf@crossblock.localdomain...
> I have a question about the type-5 conditional line. Assume I have four
> points in 3d space like this:
>
> (If you're reading LUGNET via the web interface, you must push "view raw
> message" to see my ASCII art.)
>
> 1---2
> | |
> | |
> | |
> 4---3
>
> Except that the points are _not_ in the same plane. This is difficult
> to illustrate with ASCII, so you'll have to trust me! ;-)
>
> Now, let's say I use two triangles to fill out the surface between the
> points like this:
>
> 1---2
> | /|
> | / |
> |/ |
> 4---3
>
> The code for the triangles would be something like this:
>
> 3 16 x1 y1 z1 x2 y2 z2 x4 y4 z4
> 3 16 x2 y2 z2 x3 y3 z3 x4 y4 z4
>
> But I also need a conditional edge line along the diagonal. I only have
> information about the four said points, so my question is this: Will a
> type-5 line like this work?
>
> 5 24 x2 y2 z2 x4 y4 z4 x1 y1 z1 x3 y3 z3
It looks good to me. I'm pretty sure this is how it is done on the sphere
primitives.
-John Van
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Message is in Reply To:
 | | Type-5 conditional edge line
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| I have a question about the type-5 conditional line. Assume I have four points in 3d space like this: (If you're reading LUGNET via the web interface, you must push "view raw message" to see my ASCII art.) 1---2 | | | | | | 4---3 Except that the (...) (26 years ago, 1-Apr-00, to lugnet.cad.dev)
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