how can i extract region to mesh or solid using eyeshot?

Question

i'm trying to create navigation mesh on autodesk naviswork using Eyeshot.

convert vertices and IndexTriangle to vertice triangles, after create solid using Solid.FromTriangles().

var solidList = new List();
var Solid = Solid.FromTriangles(item.vertices, item.triangles);

but it doesn't work to boolean operators at i thought.

so i want extract region for using boolean operators.

how can i extract region to mesh or solid (or vertices triangles)?

score 2 · Answer 1 · answered Jan 08 '19 at 12:10

It is very easy to do. You have to make sure your region vertese are sorted otherwise you might have some issues with it down the line but it's a simple parameter. If the shape isn't hollow here is an example :

// the verteses has to be in order and direction doesn't matter here 
// i simply assume it's drawn on X/Y for the purpose of the example
public static Region CreateRegion(List<Point3D> verteses)
{
    // create a curve list representing
    var curves = new List<ICurve>();

    // for each vertex we add them to the list
    for (int i = 1; i < verteses.Count; i++)
    {
        curves.Add(new Line(verteses[i - 1], verteses[i]));
    }

    // close the region
    curves.Add(new Line(verteses.Last(), verteses[0]));

     return new Region(new CompositeCurve(curves, true), Plane.XY, true);
}

// this extrude in Z the region
public static Solid CreateSolidFromRegion(Region region, double extrudedHeight)
{
    // extrude toward Z by the amount
    return region.ExtrudeAsSolid(new Vector3D(0, 0, 1), extrudedHeight);
}

a simple example of creating a cube of 10 by 10 by 10 from vertese (there are much easier method to make a cube but for sake of simplicity i'll make a cube)

// create the 4 verteses
var verteses = new List<Point3D>()
{
    new Point3D(0, 0, 0),
    new Point3D(10, 0, 0),
    new Point3D(10, 10, 0),
    new Point3D(0, 10, 0)
}

// create the region on the XY plane using the static method
var region = CreateRegion(verteses);

// extrude the region in Z by 10 units
var solid = CreateSolidFromRegion(region, 10d);

thank you for answer and code sample! but my model (shape) is hollow :’( — Twily, Jan 09 '19 at 08:03
@Twily this answer, answer exactly what you asked for. It create a solid from a region. now creating hollow solids is a totally different question that has nothing to do with regions. For that you create your solid then copy it, scale it down a bit and substract. — Franck, Jan 09 '19 at 15:35

how can i extract region to mesh or solid using eyeshot?

1 Answers1