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View Full Version : "Reverse Untangle" -- exists? // Meanwhile, there's this... // reference table



jeric_synergy
07-04-2014, 02:53 AM
...couldn't find my previous post on this topic, and I'm very afeared there's a simple procedure to do this, but....

So, UNTANGLE takes a polygon and turns it into a circle. The more points the better, the more circular.

Does there exist a "Reverse Untangle", that will take a circle and change it into a square grid? So, if you need to transition from a circle to a square grid, this can be done via a click? Thinking of subd modeling here.

For instance, in this picture:

122779

The hole in the bigger disk has 24 points. Rather than making another boring MAKE POLE cap here, I just want a nice flat grid of rectangles.

Ideally, a REVERSE UNTANGLE could either take a series of Points, or a series of Edges, or one big polygon, and give the user a choice of a variety of grids. In this case, a 6x6 grid=24 border points.

122781 122782

+++
But until that day, you can use this table to find a rectangular matrix that will work for borders of up to 40 points:



122780

jeric_synergy
07-04-2014, 03:02 AM
Oh, right.... search term= "perimeter".... last asked 2/2013.


And instead of REVERSE UNTANGLE, which only makes sense to veteran LWM users, another name could be http://forums.newtek.com/showthread.php?142437-quot-Reverse-Untangle-quot-exists-Meanwhile-there-s-this-reference-table.

probiner
07-04-2014, 03:13 AM
It's called Bridge...
I use Weld Strip though (Thanks Kev) https://app.box.com/s/qxq0y5zycrfph9q9z3kl

jeric_synergy
07-04-2014, 03:27 AM
It's called Bridge...
I use Weld Strip though (Thanks Kev) https://app.box.com/s/qxq0y5zycrfph9q9z3kl

How does Bridge create the grid?
122783
+++
Here's what happens when you Bridge two Edge Loops (eg, a mess):
122784


ED: clarification: in the first picture of the OP, I inserted that grid by hand.

ED2: don't see "Weld Strip" as a plugin, just a video. Not seeing a DL page on http://www.kevman3d.com/

probiner
07-04-2014, 03:38 AM
Check the video in the link :foreheads

sampei
07-04-2014, 06:19 AM
ED2: don't see "Weld Strip" as a plugin, just a video. Not seeing a DL page on http://www.kevman3d.com/

here (http://kevman3d.blogspot.co.nz/2013/12/free-lw-scripts-just-in-time-for.html)

Every4thPixel
07-04-2014, 07:30 AM
A "fill hole with grid tool" would be a nice one click solution, especially useful when the hole that needs to be filled is rotated. But modeling this by hand isn't that hard either.

jeric_synergy
07-04-2014, 10:01 AM
Check the video in the link :foreheads

??? All I get is an MP4. No link in the video.

Sampei: thanks!


A "fill hole with grid tool" would be a nice one click solution, especially useful when the hole that needs to be filled is rotated. But modeling this by hand isn't that hard either.
One click solutions are convenient, that's the whole point. Pour moi, it is quite time consuming (apparently Weld Strip is going to cure that) and determining the proper grid x-by-y surprisingly painful. But the PDF table solves that-- just inelegantly.

Ha, maybe my first Python script should be a "Hello World!" type thing that just displays the table.

jeric_synergy
07-04-2014, 03:20 PM
OH, and I spent an EMBARRASSING amount of time noodling with different arrangements of quads and was never able to get a neat, contiguous quad mesh with an ODD number of perimeter points.

BUT, you can always add 3 perimeter points to any arrangement by connecting a new quad by the corner, like so:
122791 122792 122793 122794

I think you're always going to be stuck with one tri when you close an odd-numbered hole, but at least you can get a nice mesh in there.


---gahd I hate puzzles.

JoePoe
07-04-2014, 05:20 PM
QuadSkinPatcher (http://thespread.faulknermano.com/index2.html) comes very very close to the OP issue. The edges just aren't perfectly square when coming in from a circular start. I wish it had an Absolute/Percentage option like BandSaw Ex does.

But it does "fill a hole with a grid" :thumbsup:

As far as the odd # issue goes..... I'll let you keep playing :D.

jeric_synergy
07-04-2014, 05:57 PM
QuadSkinPatcher seems to be the ticket!

djwaterman
07-05-2014, 12:27 AM
Where do you people find this stuff! QuadSkinPatcher is now added to my tool set.

jeric_synergy
07-05-2014, 01:07 AM
Where do you people find this stuff! QuadSkinPatcher is now added to my tool set.

DJ, I think the same thing every time! :beerchug:

Sadly, for me the , I'm not kidding, difficult part is remembering these hundreds of tools. :twak::eek: :stumped: