Subject:
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Re: Question: polygons filling a t-shape
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Newsgroups:
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lugnet.cad
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Date:
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Thu, 4 Dec 2003 03:16:06 GMT
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Viewed:
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473 times
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In lugnet.cad, Niels Karsdorp wrote:
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Hi,
I read somewhere (forgot where) that quads and triangles should not pass by
vertices, because this may cause gaps in some renderers.
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I suspect they will create artifacts in just about any renderer, but the
severity will vary from one to another.
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For L-shapes, the poligons should be created as on the right image:
But how should T-shapes (and H-shapes, too) be created?
(The black lines are edges, the red lines are seperators between polygons)
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The above looks fine. You could do it with one less LDraw primitive while still
preventing artifacts if you did it like so instead:
Note that all three shapes in the above diagram would be quads, with the fourth
point for quad number 2 being at the point the arrow points to. My program
LDView currently incorrectly removes that extra point, but I’ve already updated
the code to stop doing that, and the next release will act correctly.
--Travis Cobbs
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Message has 1 Reply:
 | | Re: Question: polygons filling a t-shape
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| (...) Great diagrams, thanks! But I thought that (rgarding quad 2 in the last diagram) collinear points were considered an error by the checkers, so that when you submit your part to parts tracker it would be flagged??? (21 years ago, 4-Dec-03, to lugnet.cad, FTX)
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Message is in Reply To:
| | Question: polygons filling a t-shape
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| Hi, I read somewhere (forgot where) that quads and triangles should not pass by vertices, because this may cause gaps in some renderers. For L-shapes, the poligons should be created as on the right image: (URL) But how should T-shapes (and H-shapes, (...) (21 years ago, 3-Dec-03, to lugnet.cad, FTX)
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