This page was generated from unit-4.4-occ/workplane.ipynb.

4.4.2 Workplanes

Workplanes allow 2D construction on planes in 3D space.

from netgen.occ import *
from netgen.webgui import Draw as DrawGeo

wp = WorkPlane()
wp.Rectangle(5,2)
face = wp.Face()
DrawGeo(face);

A workplane is defined by a local coordinate system given by an ‘Axes’ object. This is specified by its origin, the normal vector to the plane, and the horizontal direction (i.e. the local x direction).

f1 = WorkPlane(Axes((0,0,0), n=Z, h=X)).Rectangle(2,1).Face()
f2 = WorkPlane(Axes((0,1,0), n=-Y, h=X)).Rectangle(2,1).Face()
f3 = WorkPlane(Axes((0,0,0), n=X, h=Y)).Rectangle(1,1).Face()
DrawGeo (f1+f2+f3);

The workplane stores the current position and direction. With Line we draw a straight line of given length in the current direction, with Arc we draw a tangential arc of given radius and angle.

wp = WorkPlane()
for i in range(6):
    wp.Line(1).Rotate(60)
wp.MoveTo(3,0)
for i in range(6):
    wp.Line(0.6).Arc(0.4, 60)
face = wp.Face()
DrawGeo(face);

We can draw several wires. Holes a defined by reveriting the orientation of an wire:

wp=WorkPlane().RectangleC(2,1) \
    .Circle(0.5,0,0.2).Reverse() \
    .Circle(-0.5,0,0.2).Reverse()
DrawGeo(Compound(wp.Wires()))
DrawGeo(wp.Face());

no edge mesh, do my own sampling
no edge mesh, do my own sampling

no edge mesh, do my own sampling
no edge mesh, do my own sampling
no edge mesh, do my own sampling
no edge mesh, do my own sampling

Faces can be extruded

face = WorkPlane().RectangleC(2,1).RectangleC(1.8,0.8).Reverse().Face()
frame = face.Extrude(1)
DrawGeo(frame);

and also revolved:

face = WorkPlane().MoveTo(10,0).Line(18).Arc(2,90).Line(6).Arc(2,90) \
    .Line(18).Rotate(90).Line(2).Rotate(90).Line(10) \
    .Arc(3,-180).Line(10).Close().Face()
p = face.Revolve(Axis((0,0,0),Y),180)
DrawGeo(p);