Netgen mesh generator (ksugahar fork)

This fork adds APIs for externally imported mesh curving, enabling mesh.Curve(order) with any CAD kernel (e.g. Coreform Cubit / ACIS) without requiring OCC geometry or STEP files.

Set UV parametric coordinates on surface mesh elements. Required to provide initial UV hints for mesh.Curve(order).

el = ngmesh.Elements2D()[0] el.SetGeomInfo(0, u0, v0) # vertex 0 el.SetGeomInfo(1, u1, v1) # vertex 1 el.SetGeomInfo(2, u2, v2) # vertex 2

PR: NGSolve#232

Geometry backend with Python callbacks for surface projection. Replaces OCC geometry for mesh.Curve(order).

from netgen.meshing import CallbackGeometry def project(surfnr, x, y, z, u_hint, v_hint): # Project point onto surface, return (x, y, z, u, v) uv = cubit.surface(surfnr).u_v_from_position([x, y, z]) pos = cubit.surface(surfnr).position_from_u_v(uv[0], uv[1]) return pos[0], pos[1], pos[2], uv[0], uv[1] def normal(surfnr, x, y, z): n = cubit.surface(surfnr).normal_at([x, y, z]) return n[0], n[1], n[2] geo = CallbackGeometry(project, normal, cubit.get_surface_count()) ngmesh.SetGeometry(geo) mesh = Mesh(ngmesh) mesh.Curve(3) # High-order curving via ACIS — no OCC, no STEP

Rebuild surface element lookup tables after manually adding elements. Required for HDivSurface (BEM) on externally imported meshes.

Rebuild internal linked lists of surface elements per FaceDescriptor. Required for correct BEM assembly after manual mesh construction.

# 1. Install official ngsolve pip install ngsolve # 2. Replace netgen-mesher with this fork (from GitHub Releases) pip install <wheel-url> --force-reinstall

Wheels: https://github.com/ksugahar/netgen/releases

Based on Netgen 6.2.2602. Find the original at https://ngsolve.org