Does exist a possibility to select a loop on faceted objects ?

I use some complex files with many faces and I want to select a loop of continious egdes.
I don't seach for a loop of a single face but a loop of many edges which follows a path.
This sample is very simple but files are sometimes very much complex.

The goal is to redo a new path to have soft an clean nurbs at the end.

Seems there is that in the free Rocket 3F (I have not yet verifyed now)
https://rocket3f.com

As it's as direct Import Export to Moi in the 2 ways you will have the impression to not leave Moi! ;)

Sorry seems i had dreamed there are exotic selections but not that you want! :(

Hi Phiro, try putting this on a keyboard shortcut:

script: /* Extend edge selection one step */ var angle_degrees = 20; var cos_ang = Math.cos(angle_degrees * Math.PI / 180.0); var edges = moi.geometryDatabase.getSelectedObjects().getEdges(); for ( var i = 0; i < edges.length; ++i ) { var e = edges.item(i); var ptA = e.getStartPt(); var ptB = e.getEndPt(); var done = []; var faces = e.getFacesOfEdge(); while ( faces.length> 0 ) { var f = faces.item( faces.length-1 ); faces.removeObjectAt( faces.length-1 ); if ( done[f.id] ) continue; done[f.id] = true; var edges2 = f.getEdges(); for ( var j = 0; j < edges2.length; ++j ) { var e2 = edges2.item(j); var ptC = e2.getStartPt(); var ptD = e2.getEndPt(); var tol = 1.0e-6; var A = false, B = false, C = false, D = false; if ( moi.vectorMath.distance( ptA, ptC ) < tol ) { A = true; C = true; } else if ( moi.vectorMath.distance( ptA, ptD ) < tol ) { A = true; D = true; } else if ( moi.vectorMath.distance( ptB, ptC ) < tol ) { B = true; C = true; } else if ( moi.vectorMath.distance( ptB, ptD ) < tol ) { B = true; D = true; } if ( A || B ) { var tan_e = e.evaluateTangent( A ? e.domainMin : e.domainMax ); var tan_e2 = e2.evaluateTangent( C ? e2.domainMin : e2.domainMax ); if ( Math.abs( (tan_e.x * tan_e2.x) + (tan_e.y * tan_e2.y) + (tan_e.z * tan_e2.z) )> cos_ang ) e2.selected = true; var faces2 = e2.getFacesOfEdge(); for ( var k = 0; k < faces2.length; ++k ) { var f2 = faces2.item(k); if ( !done[f2.id] ) faces.addObject( f2 ); } } } } }

That should expand an edge selection to neighboring edges that are within a 20 degree angle.

- Michael

And here's a version that will grab a longer chain in one go:

script : /* Extend edge selection */ var angle_degrees = 20; var cos_ang = Math.cos( angle_degrees * Math.PI / 180.0 ); var done_edges =[]; while ( 1 ) { var any_change = false; var edges = moi.geometryDatabase.getSelectedObjects().getEdges(); for ( var i = 0; i < edges.length; ++i ) { var e = edges.item(i); if ( done_edges[e.id] ) continue; done_edges[e.id] = true; var ptA = e.getStartPt(); var ptB = e.getEndPt(); var done_faces = []; var faces = e.getFacesOfEdge(); while ( faces.length> 0 ) { var f = faces.item( faces.length-1 ); faces.removeObjectAt( faces.length-1 ); if ( done_faces[f.id] ) continue; done_faces[f.id] = true; var edges2 = f.getEdges(); for ( var j = 0; j < edges2.length; ++j ) { var e2 = edges2.item(j); var ptC = e2.getStartPt(); var ptD = e2.getEndPt(); var tol = 1.0e-6; var A = false, B = false, C = false, D = false; if ( moi.vectorMath.distance( ptA, ptC ) < tol ) { A = true; C = true; } else if ( moi.vectorMath.distance( ptA, ptD ) < tol ) { A = true; D = true; } else if ( moi.vectorMath.distance( ptB, ptC ) < tol ) { B = true; C = true; } else if ( moi.vectorMath.distance( ptB, ptD ) < tol ) { B = true; D = true; } if ( A || B ) { var tan_e = e.evaluateTangent( A ? e.domainMin : e.domainMax ); var tan_e2 = e2.evaluateTangent( C ? e2.domainMin : e2.domainMax ); if ( Math.abs( (tan_e.x * tan_e2.x) + (tan_e.y * tan_e2.y) + (tan_e.z * tan_e2.z) )> cos_ang ) { if ( !e2.selected ) { e2.selected = true; any_change = true; } } var faces2 = e2.getFacesOfEdge(); for ( var k = 0; k < faces2.length; ++k ) { var f2 = faces2.item(k); if ( !done_faces[f2.id] ) faces.addObject( f2 ); } } } } } if ( !any_change ) break; }

- Michael

Hi,

@Michael
Thanks a lot, Many time saved with this script... I knew it, but confirmed, you are a genious
It's very usefull to work with other soft or online services, like http://hypatiastudio.com/celticknots/ or to rework on exports.


@Pilou
I tested the Rocket3D loop, but Rocket3d is very cool but faces oriented, so i don't find how to export curves.

A before / After screenshot...

<< Export curve
I believe you must export object then extract curves in Moi! ;)

It's the limitation of the OBJ format

but you have the export DXF ! ;)

Seems not working inside Moi :(

So I use the free astonished PCONPlanner https://pcon-planner.com

Import inside the DXF from Rocket 3F then export inside Moi DXF that works! :)

Cool scripts !

@ Phiro
You don't want a selection of a loop edges one out of two ? Or i dreamed again ? :)

PS You have also Construct / Curve / Silhou who can give some interesting results! ;)
(just very few edges/points to erase /Add for have a complete loop)
with your file

http://www.entrelacs.net/-Celtic-Knotwork-The-ultimate- tutorial :)

@Phiro
Very cool prog the Hypatia onLine ! :)

Save as stl : Mesh mixer --> OBJ

Import in Moi by Native SUBD / Create from File or _importOBJ by Max SMirnov

http://moi3d.com/forum/index.php?webtag=MOI&msg=8665.195
_ExpandSelectionTangecy