Geometry Visualization

OCC (OpenCascade) geometries can be rendered directly without meshing. The GeometryRenderer displays faces, edges, and vertices with proper colors.

Rendering an OCC Shape

from netgen.occ import *
from ngsolve_webgpu import GeometryRenderer
from webgpu.jupyter import Draw

box = Box((-1, -1, -1), (1, 1, 1))
sphere = Sphere((1, 1, 1), 0.4)
shape = box + sphere

geo = OCCGeometry(shape)
renderer = GeometryRenderer(geo)
scene = Draw([renderer])

GeometryRenderer wraps three sub-renderers: faces (solid surfaces), edges (wireframe lines), and vertices (points). Each can be toggled independently.

Using the Draw Shortcut

The convenience Draw function from ngsolve_webgpu.jupyter accepts shapes and geometries directly:

from netgen.occ import *
from ngsolve_webgpu.jupyter import Draw

shape = Box((-1, -1, -1), (1, 1, 1)) - Cylinder((0, 0, -2), Z, r=0.5, h=4)
Draw(shape)

When passed a TopoDS_Shape or OCCGeometry, Draw creates a GeometryRenderer automatically.

Geometry with Clipping

from netgen.occ import *
from ngsolve_webgpu import GeometryRenderer
from webgpu.clipping import Clipping
from webgpu.jupyter import Draw

shape = Box((-1, -1, -1), (1, 1, 1)) - Sphere((0, 0, 0), 1.2)
geo = OCCGeometry(shape)
clipping = Clipping()
renderer = GeometryRenderer(geo, clipping=clipping)
Draw([renderer])

Pass a Clipping object to GeometryRenderer to enable interactive clipping of the geometry.