Convert planar surface to solid hatch while retaining display colour

Scripting
,
1

Hi,

I’d like some pointers on how to convert large numbers of planar surfaces into hatches, while retaining the surfaces properties such as display colour etc of each surface/hatch.

I need to do this so I can export the file into illustrator with the shape fills intact.

Thanks!

2

Hi @benjamin,

I have not tested this a whole lot. But this is the general idea:

import Rhino
import scriptcontext as sc

def test_surface_to_hatch():
    
    filter = Rhino.DocObjects.ObjectType.Surface
    rc, objref = Rhino.Input.RhinoGet.GetOneObject("Select planar surface", False, filter)
    if not objref or rc != Rhino.Commands.Result.Success: 
        return
    
    brep = objref.Brep()
    if not brep or not brep.Faces.Count == 1:
        return
    
    face = brep.Faces[0]
    tol = sc.doc.ModelAbsoluteTolerance
    if not face or not face.IsPlanar(tol):
        print("Not a planar surface.")
        return
        
    curves = []
    for loop in face.Loops:
        for trim in loop.Trims:
            if trim.TrimType == Rhino.Geometry.BrepTrimType.Seam:
                continue
            edge = trim.Edge
            if edge is None:
                continue
            curves.append(edge.EdgeCurve)
    
    borders = Rhino.Geometry.Curve.JoinCurves(curves, 2.1 * tol, False)
    if borders:
        hatches = Rhino.Geometry.Hatch.Create(borders, 0, 0.0, 1.0, tol);
        if hatches:
            for hatch in hatches:
                sc.doc.Objects.AddHatch(hatch, objref.Object().Attributes)
            sc.doc.Views.Redraw()
    
if __name__ == "__main__":
    test_surface_to_hatch()

Let me know if this helps.

– Dale

1 Like
3

Great! Seems to work for me on Rhino 7 for Mac.

The prompt only allows for single selected surfaces for me. Is it possible to make this work when selecting multiple surfaces?

Many thanks!

4

Hi @benjamin,

Instead of using RhinoGet.GetOneObject, just use RhinoGet.GetMultipleObjects and loop through the returned object references.

test_surface_to_hatch.py (1.3 KB)

– Dale

5

Apologies for the slow reply - this work great, thank you!