Subject:
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Re: Filling closed shapes?
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 13 Oct 2009 14:12:47 GMT
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Viewed:
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9378 times
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In lugnet.cad, Philippe Hurbain wrote:
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Hi Santeri,
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Hi all - I’ve been working on the life
counter part, which is a patterned version of the sprocket wheel. I then
managed to make the flat pattern and did a projection of the pattern on the
3d former, only to find this 3d pattern contain numerous gaps and rougly 80
warped quads,- even worse, when I split these warped quads there then were
TONS of new tiny gaps, making the part look horrible. Not to mention I made
the pattern too small. :-(
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Size doesn’t look that bad !?
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It’s a little too small to annoy me.. the picture on Peeron seems like a
misprint to me.
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My problem probably was that I had made the fills in the pattern by making a
plane quad covering the shape (made of lines), making a cutter file from the
line shape and using Intersector on the quad, which isn’t the best way to go
but it was the only one I saw. I was aware of the gaps, thinking that they
were too small to really hinder the part’s quality. Additionally I used a
non-triangle-condensing cut when gaps showed up and scaling factor didn’t
work...
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I don’t see why you needed to re-do the surface? Why not use the top shape of
the part and flatten it? Or maybe there is something I missed?
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I mean that I first get a particular shape in its outlines (like a bunch of
lines forming a 2) and I need to make a flat quad that covers it all, extrude
the outlines to get a cutter and intersect the shape out. It’s like making
gingerbread men.
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So, now I plan to remake the pattern. And this time the right way. But first
I’d need a proper technique to make the fill for the line shape. Anybody
aware of something... ? Quad2Dat is out of the question because the
background image feature doesn’t work at all here.
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Why shouldn’t it work? Though Quad2Dat has a lot of issues, background image
feature always worked fine for me. See the method I describe here...
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I don’t know why shouldn’t it, but for some reason the background image always
appears all black in the main window (though in the preview it seems fine) :-(
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That said, I agree that having to align all quads of the pattern on underlying
surface can be a nightmare (especially considering the flimsiness of the
“align” tool of Quad2Dat). So I have created a new tool, Slicerpro
(slicer-projector) that not only projects the pattern on the former but also
slices it along the edges of the former. In addition, it may also do small
adjustments to vertices coordinates to make them match if previous rounding
errors occured. So there should be less gaps...
I have not yet written the documentation, but if you want to try it, get it
here: http://philohome.free.fr/xfer/Slicerpro.zip
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Hmm... when I do the projection with Slicerpro the main gaps seem to go away.
However (forgot to note), both Projector and Slicerpro leave some
“legs” in the 3d
pattern, like if some vertices were having bad Y-coordinates.
The picture in my first post has a projection done with a makeshift projector I
whipped up.. it doesn’t leave any legs but has the gaps.
One solution I see would be to slice the pattern with Slicerpro and projecting
with the makeshift projector. Slicerpro just leaves some gaps in the skull.. but
not too many that I couldn’t do it manually.
Now, is the
pattern too small? IMHO there’s a little too much main-colored area.
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Message has 1 Reply:
 | | Re: Filling closed shapes?
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| (...) Use Coverer? That should probably work here. (...) Weird. Strange image format? could you email it to me, as well as all files you have for this project, including intermediate ones if you kept them (I hope I'll figure out which is which). (...) (15 years ago, 13-Oct-09, to lugnet.cad)
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Message is in Reply To:
| | Re: Filling closed shapes?
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| Hi Santeri, (...) Size doesn't look that bad !? (...) I don't see why you needed to re-do the surface? Why not use the top shape of the part and flatten it? Or maybe there is something I missed? (...) Why shouldn't it work? Though Quad2Dat has a lot (...) (15 years ago, 13-Oct-09, to lugnet.cad)
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