README

PascalCad

PascalCad is a Lazarus LCL component for creating, reading, writing and visualizing CAD entities in Free Pascal. It supports solid modeling (boolean operations on triangle meshes), surface modeling (NURBS, Bezier, mesh surfaces), and curve/point primitives.

Inspired by OpenCascade, Rhinoceros, xEagle, and OpenSCad.

Features

• 3D Primitives — Point, Vector, Line, PolyLine, Polygon, Triangle, Circle, Ellipse
• Curve Primitives — B-Spline curves with de Boor basis functions
• Surface Primitives — Bezier surfaces, NURBS surfaces (rational B-spline with weights and knot vectors)
• Solid Primitives — Box, Sphere, Cylinder (each generates a TriangleMesh)
• Triangle Meshes — TTriangleMesh with volume, area, centroid, clone, and solid/non-solid flag
• Solid Modeling — Union, Subtraction, Section (on solid meshes)
• Feature Operations — Extrude, Sweep, Pocket
• Surface Modeling — Trim, PunchHole, ExtendSurface
• Transformations — Scale, Rotate, Translate
• LCL Components — TPascalCadComponent (entity manager), TPascalCadViewport (with mouse orbit/pan/zoom), TPascalCadScripter (scripting support)
• Package — Delivered as a Lazarus package (PascalCad.lpk)

Installation

1. Open Lazarus
2. Package → Open Package File (.lpk)
3. Select PascalCad.lpk
4. Click Compile, then Install (or Use → Add to Project)
5. The PascalCad, PascalCadViewport, and PascalCadScripter components appear on the component palette

Quick Start

Drop a TPascalCadComponent and a TPascalCadViewport on a form, link the viewport's CadComponent property, then create entities:

CadComponent1.AddBox('Box1',
  TPoint3D.Create(0, 0, 0),
  TPoint3D.Create(10, 10, 10));

Project Structure

Src/
????????? Common/                  # Shared constants (PConstants.inc)
????????? CadPrimitives/           # Point, Vector, Line, Triangle, Circle, Ellipse,
???                            # PolyLine, Polygon, BSpline, BezierSurface,
???                            # NurbsSurface, TriangleMesh, Box, Sphere, Cylinder
????????? SolidModelingOperations/ # Union, Subtraction, Section
????????? FeatureOperations/       # Extrude, Sweep, Pocket
????????? SurfaceModelingOperations/ # SurfaceTrim, PunchHole, ExtendSurface
????????? Transformations/         # Scale, Rotate, Translate
????????? LCLComponents/           # PascalCadComponent, PascalCadViewport, PascalCadScripter

Dependencies

• Lazarus LCL
• Free Pascal 3.2+ / Lazarus 2.2+ (recommended)

License

MIT