[REQ] triangulation ruby

solo · 5 Dec 2009, 21:15

I have no idea how easy this is to make, but I'd really appreciate if anyone could take a stab at creating a ruby that can triangulate all rectangular polygons to triangles.

If possible to have a few different triangulation options, see image.

If possible can it triangulate with say 1,2,3 iriterations as well as 3 different patterns?

The reason I'd like this is for a new 'organic' modeling method I have brewing.

thanks for consideration.

Chris Fullmer · 5 Dec 2009, 21:17

Could you guarantee that all quads are truly quads in your process? ie, not actually triangles with an inner edge smoothed so it just looks like a quad?

If this really only needed to be developed for quads, then yes, it should be quite do-able I think.

Chris

remus · 5 Dec 2009, 21:20

i think TIGs written such a plugin already, called something like triangulate.rb im sure a quick search will throw up some results. It wouldnt do your different methods of triangulation but its a start.

TIG · 5 Dec 2009, 21:23

My triangulateQuadFaces.rb already triangulates quad faces successfully but always from vertex[0] to vertex[2].
It's here http://forums.sketchucation.com/viewtopic.php?p=201025#p201025
You seem to want a subdivide option on top of that?
My [and CJP's and TT's!] triangulateFaces.rb triangulates any face successfully but is 'messy', just like auto-fold ! http://forums.sketchucation.com/viewtopic.php?p=175613#p175613

solo · 5 Dec 2009, 21:29

TIG, you are correct, I want to use it with the SDS plugin, the current triangulation does not work well on all shapes, so if I had more ways to triangulate before subdivision the better and smoother results I can accomplish.

solo · 5 Dec 2009, 21:41

TIG, I downloaded both the ruby's and they work great for triangulating quads, and they seem to triangulate differently from each other (I did a test with a box), however they only split the quad, so they can only do 1 iriteration. Now id another ruby can be added to split a triangle into two, that would be awesome.
Or... one ruby with an options panel, thus incorporating all triangulation/splitting ruby's into one.

TIG · 5 Dec 2009, 22:13

The 'basic quad' version always divides a four-sided face from its vertex[0] to its vertex[2] wherever they are.
The 'general' version triangulates quads and upwards, but this uses the API mesh methods to divide the faces - this seems to take a face and divides it up from the first vertex it finds - which might be nearest the camera ? Therefore the results can differ...

They have a built in check and ignore any three-sided faces as they are already triangulated.

You could run [a yet to be invented script] 'subdivideAndTrianglulateQuadFaces()'...
Which subdivides each quad-face into a triangle [AND beyond], which is overlaid so that you have your 3/4/5th option for the subdivision: however, your 6th version needs to be done to the quad first as it becomes 4 quads then subdivided [its sibling is type-4]...

It's quite possible - any other ideas before I sleep on it ?

solo · 5 Dec 2009, 22:18

Yea, that sounds awesome.

If it can group after triangulation that would be very handy when you need to SDS just parts of a model/mesh.

DIEGO-RODRIGUEZ · 5 Dec 2009, 23:38

other opcion is subdivideSelected.rb (in English) of wikii.

has two options.

division triangular
division rectangular

TIG · 5 Dec 2009, 23:48

Solo
So, if your Mandarin is up to it, then it might already exist ?

solo · 5 Dec 2009, 23:55

ooooh!

Anyone able to translate that ruby? is it free? how can I get an English version?

jeff hammond · 6 Dec 2009, 00:03

hey Pete,

wikii is a member here and i think that tool is included in SUtools?

http://forums.sketchucation.com/viewtopic.php?f=180&t=14480

the download link is missing now though.. maybe PM him?

[edit] oops, fixed link.

DIEGO-RODRIGUEZ · 6 Dec 2009, 00:13

the plugin is free and simple of traslate

http://forums.sketchucation.com/viewtopic.php?f=323&t=24207

tallbridgeguy · 6 Dec 2009, 01:09

Could somebody post a link to the ruby? It looks like a plugin I could use as well.

thanks!
s

TIG · 6 Dec 2009, 15:18

Here's a tweaked version of it, I've given it a Plugins submenu 'Subdivide Selected' with the two options of 'At Vertices' and 'At Mid-Points'.
I also made a few minor adjustments and moved the midpoints def inside of the main def wrapper to avoid clashes with others...
Seems to work fine.
Hope wikii doesn't mind...
subdivideSelected.rb

DIEGO-RODRIGUEZ · 6 Dec 2009, 15:36

exelente tig. thank you very much.

Maybe, Jim can add this option to plug protrudes, NO?

EarthMover · 6 Dec 2009, 16:59

Thanks TIG. Plugin works great for me. Curious to see Pete's new SDS method.

solo · 6 Dec 2009, 17:31

Thanks a bunch TIG, this should do the trick.

Adam, I am planning to use this division with Sculpt tools and SDS. Sculpt tools works great for moving vertices on pre-divided meshes, I feel like I have more control over what to expect from the subdivision now.

thomthom · 8 Dec 2009, 21:05

Moved the thread to the Developer's forum. We have reorganized so that the Plugin section is only a list of plugins you can download and use.