AutoCAD Regions and 3D Solids

Use this skill when creating or manipulating regions (2D enclosed areas), 3D solids, surfaces, and bodies. Covers boolean operations, solid primitives, extrusion/revolution/sweep/loft, mass properties, sectioning, and sub-entity access via the Brep API.

Region Creation from Closed Curves

Regions are 2D enclosed areas created from closed curve boundaries. Region.CreateFromCurves accepts a DBObjectCollection of curves that form one or more closed loops (curves must meet end-to-end within tolerance).

using (Transaction tr = db.TransactionManager.StartTransaction())
{
    BlockTableRecord btr = (BlockTableRecord)tr.GetObject(
        db.CurrentSpaceId, OpenMode.ForWrite);