No constructor for Vertex object ?

Didier Bur

Hi,
Apparently there is no Vertex.new() method.
How would you (if it is possible) create a vertex object otherwise than creating an edge that starts from this vertex.position ?
Given v a vertex, v.position.set!(x,y,z) doesn't update the vertex too.

My problem is that I have to move vertices at the "vertex level" to deform shapes and faces. Any idea ?

thomthom

Either one of these work - I use them for Vertex Tools:
entities.transform_entities( transformation, array_of_vertices )
entities.transform_by_vectors( array_of_vertices, array_of_vectors )

It would have been convenient if Vertex had a transform! method, or a setter for position.

@didier bur said:

How would you (if it is possible) create a vertex object otherwise than creating an edge that starts from this vertex.position ?

No way to create vertices. Probably because SketchUp doesn't have native vertex editing capabilities. Other software let yo create single unconnected vertices. But I'm not sure how much use it'd have in SketchUp.

Didier Bur

@unknownuser said:

Either one of these work - I use them for Vertex Tools

TIG

If you think about it a Vertex can't exist without an Edge !
That's what a Vertex is - the .start/ .end of an Edge.
Although there is a verts=face.vertices method it's effectively shorthand to verts=[]; face.edges.vertices.each{|v|verts << v if not verts.include?(v)} - a Face can't have Vertices without it having at least one Loop of Edges - as you know all too well... when you accidentally erase one such Edge the Face erases with it...

So to add a new Vertex you need either to make a new Edge starting from the required vertex.position - then you'll have the new Vertex as newedge.start; or if you want a new Vertex on an existing Edge... here let's assume half way along it... then new_vertex=edge.split(0.5).start will add it.

If you want the new Vertex to be associated with an existing Face then it must be on one of the face.outer_loop.edges [or any of the .edges from [ruby:1rgyg24s]face.loops[i][/ruby:1rgyg24s] if it's to be on the perimeter of a 'hole'].

To make a new Vertex associated with a new Face you'll need three Vertices - the [ruby:1rgyg24s]face=entities.add_face(p0, p1, p3)[/ruby:1rgyg24s] will make a triangular Face from any three [ruby:1rgyg24s]Points[/ruby:1rgyg24s] [if there are more [ruby:1rgyg24s]Points[/ruby:1rgyg24s] they must be coplanar]... These three+ [ruby:1rgyg24s]Points[/ruby:1rgyg24s] can be made using vertex.position for an existing Vertex if you are adding to it, OR if new, using [ruby:1rgyg24s]Point3d[/ruby:1rgyg24s] where you want a new Vertex at that [ruby:1rgyg24s]Point[/ruby:1rgyg24s].

As already explained the [ruby:1rgyg24s]entities.transform_entities(transformation, entsarray)[/ruby:1rgyg24s] and [ruby:1rgyg24s]entities.transform_by_vectors(entsarray, vecsarray)[/ruby:1rgyg24s] will transform [ruby:1rgyg24s]vertices[/ruby:1rgyg24s] en mass, if pass them as the [ruby:1rgyg24s]entsarray[/ruby:1rgyg24s]...

thomthom

@tig said:

If you think about it a Vertex can't exist without an Edge !

No in SketchUp world - but you can create stand-alone vertices in 3DsMax.

TIG

@thomthom said:

@tig said:

If you think about it a Vertex can't exist without an Edge !

No in SketchUp world - but you can create stand-alone vertices in 3DsMax.

I was talking "in Sketchup World"... where else are we?
You can make a 'guide-point' in Sketchup - cpt=entities.add.cpoint(pt) but it isn't a vertex - cpt.position will return its Point3d though... cpoints don't 'stick' to anything so they are relatively useless as 'vertices' but can form useful 'markers for future vertices - like 3d-mesh made from a points cloud...