slf file format conversion

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 From:  bemfarmer
5410.1 
Does anyone know of a file conversion program for ths .slf file format, which is used by the old SLIDE program?
It is composed mostly of Faces, quad points, and some surface patch graphics. There is no vertex information.
It seems to be an old 3d format. There is very little google information.
I'm currently stripping away all but the quad points, with excel, for future point import to MoI. This may be all
that is necessary, so it is not worth spending much time on a translation program.
If an amateur programmer were to attempt a simple "translation," which 3d format would be easy to convert to, PLY, OBJ,
STL...?
(It is for a Genus_3 Tetrus, by (former) student SteveAn, at UC Berkeley.)

EDITED: 9 Aug 2013 by BEMFARMER

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 From:  futagoza (STEFAN)
5410.2 In reply to 5410.1 
Hi Ben,

i would PM Torolf aka Jotero (assuming he's visiting the forums here often) because he used SLIDE in the past as far as i remember.

Regards
Stefan
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 From:  futagoza (STEFAN)
5410.3 In reply to 5410.2 
Hi Ben, me again...

i just looked up the shape at Google Images and would thing if you have a poly modeler too, that you simply create a tetrahedron, make a thick frame out of the edges and than subdivide (Catmull-Clark) the shape. Well, just a thought.



Regards
Stefan

EDITED: 30 Oct 2016 by STEFAN

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 From:  bemfarmer
5410.4 In reply to 5410.3 
Thank you Stephen.
I did not know Catmull-Clark would do that.
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 From:  Frenchy Pilou (PILOU)
5410.5 
If you want a cool free subdivison modeler try the free Hexagon 2 ;) MAC and PC
http://www.daz3d.com/products/hexagon/hexagon-what-is-hexagon

extensive docs: PDF and videos Quick time!
http://docs.daz3d.com/doku.php/public/software/hexagon/start

it has different sorts of subdivisions!

For the little story it was created by a French team! ;)

Have fun modeling!

>>To enable even more precise and flexible modeling and texturing, Wintab-compatible tablets (such as the Wacom line) are now fully supported for 3D paint and displacement brushes.


EDITED: 18 Sep 2012 by PILOU

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 From:  futagoza (STEFAN)
5410.6 In reply to 5410.5 
...me again,

couldn't resist to run the mesh through T-Splines Demo. Maybe it's useful for you in the dimensions as it is?!



Regards
Stefan

EDITED: 4 Nov 2016 by STEFAN

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 From:  Frenchy Pilou (PILOU)
5410.7 
With Sketchup and Artisan ;)
http://artisan4sketchup.com/

---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  Michael Gibson
5410.8 In reply to 5410.1 
Hi Brian,

> If an amateur programmer were to attempt a simple "translation,"
> which 3d format would be easy to convert to, PLY, OBJ, STL...?

Any of those are not too complicated, I would probably recommend OBJ format since it's pretty widespread.

There seems to be a pretty decent explanation here: http://en.wikipedia.org/wiki/Wavefront_.obj_file

And a basic OBJ file can have a pretty simple structure - it's a text file and you'll put in a list of vertices, each vertex will be a line in the text file starting with v followed by x y z coordinates like:

v 0.123 0.234 0.345
v 2.552 5.223 0.251
v 4.223 5.652 2.611


and then to form polygons you make "face" entities after that in the text file. A face can refer to both regular vertices like listed above, and also can refer to texture coordinates and vertex normals. For just basic polygon transfer you can ignore the texture and vertex normals and in that case each face starts with f and then has a list of 1-based (note not zero based) vertex indices. So stuff like

f 1 4 2
f 4 5 1
f 2 5 2

etc...

So all those v lines followed by those f lines will make an OBJ file.

- Michael
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 From:  bemfarmer
5410.9 
Thank you Michael, Stephen, and Pilou.
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 From:  mariomarimba
5410.10 
top mod would be the way to do this kind of things
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 From:  futagoza (STEFAN)
5410.11 In reply to 5410.10 
After posting the .3dm file i thought maybe i should do a little bit with this shape. So i fired up MoI again and separated the shape and used "Inset" on each surface. Hope you like.



Regards
Stefan
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 From:  TpwUK
5410.12 In reply to 5410.11 
Well it gets a thumbs up from me ... Made from the right materials you could have a rehab toy there.

Nice job futagoza

Martin
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 From:  bemfarmer
5410.13 In reply to 5410.11 
How was this tetrus created? With T-Splines for Rhino?
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 From:  Frenchy Pilou (PILOU)
5410.14 
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 From:  bemfarmer
5410.15 In reply to 5410.14 
So Surface Evolver works by area or energy minimization..., which is what the tetrus is supposed to have.
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 From:  Frenchy Pilou (PILOU)
5410.16 
Little test :)

A rounded filleted triangle on the ground
Sweep a circle
Copy rotate
ArrayCircular *3
Union

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 From:  futagoza (STEFAN)
5410.17 In reply to 5410.16 
@Martin Thank you, much appreciated!

@Brian Yes, i used T-Splines Demo with Rhino Demo.

Well, i could try the Tetrus also with Surface Evolver, but i assume then it would be much thicker in some areas and then i'm not able to run it through T-Splines, because i have never tried to obtain quads out of Evolver...

Best regards
Stefan
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 From:  futagoza (STEFAN)
5410.18 
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