Subject:
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Re: Why should parts not have vertices lying along edges?
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Newsgroups:
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lugnet.cad.dev
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Date:
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Thu, 12 Dec 2002 02:22:05 GMT
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Viewed:
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754 times
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In lugnet.cad.dev, Orion Pobursky writes:
> In lugnet.cad.dev, Tony Hafner writes:
> > How bad is this? Should I care at all? Which renderers have this problem,
> > or which have it the worst? Is this a rule that I can happily throw out if
> > there is much to be gained by doing so?
>
> My opinion is that this isn't a significant enough problem to worry about.
> Further more, I consider this is a renderer limitation and not a problem
> with the part itself. Therefore, feel free to ignore this if it suits your
> purposes.
I wouldn't ignore it lightly as it can have many adverse effects.
You get little holes from from the roundoff errors. You can also
see it in lighting problems with more advanced renderers such as
ldview and POV. Here's an old example of the lighting issue as
demonstrated by ldview.
http://www.brickshelf.com/gallery/dheyse/temp/6203ldview.png
In this example two half circles butt up against one rectangle.
If the rectangle had been broken up into 2 rectangles to match the
circle center points along it's edge there'd be no problem with
the lighting. I suppose you could blame this on the renderer for
not being smart enough to automatically tesselate the rectangle,
but I wouldn't.
Don
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