49 lines
2 KiB
C
49 lines
2 KiB
C
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// This source code is property of the Computer Graphics and Visualization
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// chair of the TU Dresden. Do not distribute!
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// Copyright (C) CGV TU Dresden - All Rights Reserved
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#pragma once
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#include "Box.h"
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#include "util/OpenMeshUtils.h"
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/*
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a triangle primitive which can be used with the AABBTree and the HashGrid data structure
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*/
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class Triangle
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{
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//internal storage of the first vertex position of the triangle
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Eigen::Vector3f v0;
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//internal storage of the second vertex position of the triangle
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Eigen::Vector3f v1;
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//internal storage of the third vertex position of the triangle
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Eigen::Vector3f v2;
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//internal storage of the optional face handle to identify the originating face in a half edge mesh instance
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OpenMesh::FaceHandle h;
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public:
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//default constructor
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Triangle();
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//constructs a triangle using the vertex positions v0,v1 and v2
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Triangle(const Eigen::Vector3f& v0, const Eigen::Vector3f& v1,const Eigen::Vector3f& v2);
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//constructs a triangle from the face f of the given halfedge mesh m
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Triangle(const HEMesh&m, const OpenMesh::FaceHandle& f);
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//returns the axis aligned bounding box of the triangle
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Box ComputeBounds() const;
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//returns true if the triangle overlaps the given box b
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bool Overlaps(const Box& b) const;
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//returns the barycentric coordinates of the point with thesmallest distance to point p which lies on the triangle
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void ClosestPointBarycentric(const Eigen::Vector3f& p, float& l0, float& l1, float& l2) const;
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//returns the point with smallest distance to point p which lies on the triangle
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Eigen::Vector3f ClosestPoint(const Eigen::Vector3f& p) const;
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//returns the squared distance between point p and the triangle
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float SqrDistance(const Eigen::Vector3f& p) const;
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//returns the euclidean distance between point p and the triangle
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float Distance(const Eigen::Vector3f& p) const;
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//returns a reference point which is on the triangle and is used to sort the primitive in the AABB tree construction
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Eigen::Vector3f ReferencePoint() const;
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};
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