Feature Request: True Swept Solid for Tool Paths

[gsdali]

Background

PadCAM needs to represent cutting tools as 3D objects for:

1. Generating tool shapes for visualization
2. Creating swept volumes for WIP (Work In Progress) simulation
3. Collision detection

The current Shape.toolSweep() function works well for flat end mills but uses an approximation (cylinders + box). This is conservative and safe for CAM.

Current Capabilities (Sufficient for All Phases)

OCCTSwift already has everything needed for tool geometry:

Feature	Method	Use Case
Cylinder	Shape.cylinder()	Tool body, flat end mill
Sphere	Shape.sphere()	Ball nose tip
Torus	Shape.torus()	Corner radius construction
Revolution	Shape.revolve()	Tool from 2D profile
Tool Sweep	Shape.toolSweep()	Swept volume (approximation)
Booleans	union, subtracting, intersection	Constructing complex shapes

Nice-to-Have Feature (Low Priority)

True Swept Solid Along Path

For more accurate tool engagement simulation with complex toolpaths:

extension Shape {
    /// Create a swept solid by moving a profile along a path
    /// Uses BRepOffsetAPI_MakePipeShell for accurate swept volumes
    static func sweep(
        profile: Shape,
        along path: Wire,
        keepContact: Bool = true
    ) -> Shape?
}

OCCT Class: BRepOffsetAPI_MakePipeShell

This would enable:

• Exact swept volumes for curved toolpaths
• Better tool engagement analysis
• More accurate collision detection

Priority: Low

This feature is not blocking. The existing toolSweep() approximation is:

• Conservative (removes slightly more material than actual)
• Safe for CAM (real tool will always fit in simulated WIP)
• Sufficient for all planned operations

References

• ISO 13399 - Cutting Tool Data
• OCCT BRepOffsetAPI_MakePipeShell
• PadCAM research: Documentation/Tool_Geometry_Reference.md