茂之钳
55 lines
2.0 KiB
C++
55 lines
2.0 KiB
C++
#pragma once
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#include "vde/curves/nurbs_surface.h"
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#include "vde/curves/nurbs_curve.h"
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#include "vde/core/point.h"
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#include "vde/core/aabb.h"
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#include <optional>
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#include <vector>
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namespace vde::brep {
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/// A p-curve: 2D curve in the parameter space of a surface
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/// We reuse NurbsCurve with Z=0 — only X (u) and Y (v) are meaningful.
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using PCurve = curves::NurbsCurve;
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/// Trimming loop: closed contour in parameter space (u, v)
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/// An outer loop defines the boundary; inner loops define holes.
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struct TrimLoop {
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std::vector<PCurve> p_curves; ///< parameter-space curves forming the loop
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bool is_outer = true; ///< true = outer boundary, false = hole
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};
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/// A trimmed surface: base NURBS surface + trimming loops in parameter space
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///
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/// Point classification: a parameter (u, v) is INSIDE if it lies within
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/// the outer loop AND outside all inner loops.
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///
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/// This is the fundamental B-Rep primitive used by all industrial CAD kernels
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/// (Parasolid, ACIS, CGM).
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///
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/// @ingroup brep
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struct TrimmedSurface {
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curves::NurbsSurface base_surface; ///< Underlying geometry
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std::vector<TrimLoop> loops; ///< Trimming loops (first = outer boundary if marked)
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/// Evaluate the surface at (u, v).
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/// Returns the 3D point only if (u, v) is inside the trimmed region.
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/// @return Point3D if inside, std::nullopt if outside
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[[nodiscard]] std::optional<core::Point3D> evaluate(double u, double v) const;
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/// Check if a parameter point is inside the trimmed region
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[[nodiscard]] bool is_inside(double u, double v) const;
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/// Get the axis-aligned bounding box of the trimmed surface
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[[nodiscard]] core::AABB3D bounds() const;
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/// Create an untrimmed surface (full parameter domain)
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static TrimmedSurface from_surface(const curves::NurbsSurface& surf);
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/// Create a rectangular trimmed surface
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static TrimmedSurface from_rect(const curves::NurbsSurface& surf,
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double u0, double u1, double v0, double v1);
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};
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} // namespace vde::brep
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