茂之钳
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
#pragma once
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/**
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* @file brep_face_split.h
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* @brief B-Rep face splitting by plane
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*
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* Splits faces that partially intersect a cutting plane, producing
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* cleanly separated face fragments. Used to improve boolean operation
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* quality by replacing coarse centroid-based IN/OUT classification
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* with precise geometric splitting.
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*
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* @ingroup brep
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*/
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#include "vde/brep/brep.h"
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#include "vde/core/point.h"
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#include <vector>
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namespace vde::brep {
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/**
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* @brief Split a face by a plane
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*
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* Cuts a single B-Rep face with an infinite plane, producing up to
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* two face fragments (one on each side of the plane). Each fragment
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* is a valid BrepModel with proper loop topology.
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*
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* **Algorithm:**
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* 1. Get the face's ordered vertices by traversing the outer loop
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* 2. Classify each vertex as positive (distance ≥ 0) or negative (distance < 0)
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* 3. If all vertices are on the same side: return the face as a single fragment
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* 4. Otherwise: build two new faces:
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* - Face A: vertices on the positive side + intersection points
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* - Face B: vertices on the negative side + intersection points
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*
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* @param body Source B-Rep body containing the face
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* @param face_id Index of the face to split
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* @param plane_point A point on the cutting plane
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* @param plane_normal Normal vector of the cutting plane (need not be unit-length)
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* @return Vector of 0, 1, or 2 face fragment BrepModels
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*
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* @code{.cpp}
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* auto box = make_box(2, 2, 2);
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* // Split face 0 of the box with the YZ plane (x=0)
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* auto frags = split_face_by_plane(box, 0, Point3D(0,0,0), Vector3D(1,0,0));
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* // frags.size() == 2: left half and right half
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* for (auto& f : frags) {
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* // Each fragment has its own vertices, edges, loop, and surface
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* assert(f.is_valid());
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* }
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* @endcode
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*/
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[[nodiscard]] std::vector<BrepModel> split_face_by_plane(
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const BrepModel& body, int face_id,
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const core::Point3D& plane_point,
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const core::Vector3D& plane_normal);
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} // namespace vde::brep
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