Grabbing Points from Layer and Casting Objects to Point3d in C#

Hello,

I am attempting to grab various geometries from layers in Rhino and using them as input in a C# component. I used code provided here on the forums in VB and translated it to C# to grab objects from layers:

String layer = "Points";

Int32 layer_index = doc.Layers.Find(layer, true);
if ((layer_index < 0))
return;

Rhino.DocObjects.Layer lay = doc.Layers[layer_index];
Rhino.DocObjects.RhinoObject[] objs = doc.Objects.FindByLayer(lay);
if ((objs == null))
return;

List<GeometryBase> geo = new List<GeometryBase>();
foreach (Rhino.DocObjects.RhinoObject obj in objs) {
geo.Add(obj.Geometry);
}

A = geo;

My issue here is that the grabbed "objects" should be casted to Point3d, and I can't figure out how this is done. Can someone help me with:

How to cast the grabbed objects to different geometry types (Point3d, curves, surfaces) Or,
How to grab geometry types in a certain layer using entirely different code that grabs Point3d, etc... rather than "objects"?

Thanks!

Tarek

Replies to This Discussion

Permalink Reply by Florian Frank on December 22, 2012 at 1:11pm

Hi Tarek,

You can use the Grasshopper Types to cast from GeometryBase to Rhinocommon types.

1. Method:

    List<Point3d> geo = new List<Point3d>();

    foreach (Rhino.DocObjects.RhinoObject obj in objs) {
      GH_Point p = new GH_Point();
      p.CastFrom(obj.Geometry);
      geo.Add(p.Value);
    }

2. Method:

    List<Point3d> geo = new List<Point3d>();

    foreach (Rhino.DocObjects.RhinoObject obj in objs) {
      GH_Point p = new GH_Point(obj.Id);
      p.LoadGeometry(doc);
      geo.Add(p.Value);
    }

Cheers FF

Permalink Reply by Tarek Rakha on December 22, 2012 at 1:21pm

Thanks a lot Florian!

See I am not sure where I can get this kind of information (specifically about GH Types and casts), this forum helps a lot and I am very grateful.

Quick fix just in case someone looks this up:

List<Point3d> geo = new List<Point3d>();

foreach (Rhino.DocObjects.RhinoObject obj in objs) {
GH_Point p = new GH_Point();
p.CastFrom(obj.Geometry);
geo.Add(p.Value);

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