#include <Triangle.h>

Inheritance diagram for Triangle:

Public Member Functions
	Triangle ()=default

	Triangle (const libMesh::Point &p0, const libMesh::Point &p1, const libMesh::Point &p2)

	~Triangle () override=default

libMesh::Point	normal () const
	Normal vector of the triangle.

bool	intersect (const LineSegment &l, libMesh::Point &intersect_p) const
	Check if a line segment intersects this triangle.

bool	intersect (const LineSegment &line_segment) const override
	Check if a line segment intersects this triangle, without returning the intersection point.

Ball	computeBoundingBall () const override
	Compute a bounding ball for this triangle.

Private Attributes
libMesh::Point	_p0

libMesh::Point	_p1

libMesh::Point	_p2

Detailed Description

Triangle geometry helper.

Definition at line 21 of file Triangle.h.

Constructor & Destructor Documentation

◆ Triangle() [1/2]

Triangle::Triangle ( )

default

◆ Triangle() [2/2]

Triangle::Triangle	(	const libMesh::Point &	p0,
		const libMesh::Point &	p1,
		const libMesh::Point &	p2
	)

◆ ~Triangle()

Triangle::~Triangle ( )

overridedefault

Member Function Documentation

◆ computeBoundingBall()

Ball Triangle::computeBoundingBall ( ) const

overridevirtual

Compute a bounding ball for this triangle.

Implements GeometryBase.

Definition at line 88 of file Triangle.C.

{
  const Point centroid = (_p0 + _p1 + _p2) / 3.0;
 
  Real max_sq_dist = 0.0;
  for (const auto * p : {&_p0, &_p1, &_p2})
  {
    const Real dist_sq = (*p - centroid).norm_sq();
    if (dist_sq > max_sq_dist)
      max_sq_dist = dist_sq;
  }
 
  const Real radius = std::sqrt(max_sq_dist);
  return Ball(centroid, radius);
}

Referenced by SurfaceTri3::computeBoundingBall().

◆ intersect() [1/2]

bool Triangle::intersect	(	const LineSegment &	l,
		libMesh::Point &	intersect_p
	)		const

Check if a line segment intersects this triangle.

Referenced by SurfaceTri3::intersect(), and intersect().

◆ intersect() [2/2]

bool Triangle::intersect ( const LineSegment & line_segment ) const

overridevirtual

Check if a line segment intersects this triangle, without returning the intersection point.

Implements GeometryBase.

Definition at line 81 of file Triangle.C.

{
  libMesh::Point p;
  return intersect(line_segment, p);
}

◆ normal()

Point Triangle::normal ( ) const

Normal vector of the triangle.

Definition at line 21 of file Triangle.C.

{
  const auto v1 = _p1 - _p0;
  const auto v2 = _p2 - _p0;
 
  const auto n = v1.cross(v2);
  const Real norm = n.norm();
  if (norm == 0.0)
    mooseError("Triangle: cannot compute the normal of a degenerate triangle.");
 
  return n / norm;
}