CGAL 6.2 - 3D Mesh Generation: BisectionGeometricTraits_3 Concept Reference

CGAL 6.2 - 3D Mesh Generation

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BisectionGeometricTraits_3 Concept Reference
Reference Manual » Secondary Concepts

## Definition

The concept `BisectionGeometricTraits_3` describes a geometric traits class that provides the basic types and operations to implement a model of `MeshDomain_3` based solely on intersection detections. Points in the non-empty intersections are herein computed by bisection.

Such traits class is relevant when intersection detections can be performed efficiently. For instance, when bounding surfaces are implicitly described by a function (such as an isosurface of a 3D function from \( \mathbb{R}^3\) to \( \mathbb{R}\)), the do-intersect predicate with a segment is computed by evaluations of the function values at both end points of the segment.

Has models
  All models of the CGAL concept `Kernel`

See also
  `ImplicitSurfaceTraits_3`
  `IntersectionGeometricTraits_3`
  `CGAL::Labeled_mesh_domain_3<BGT>`

## Types
typedef unspecified_type | FT
| Numerical type.
typedef unspecified_type | Point_3
| The point type.
typedef unspecified_type | Segment_3
| Segment type.
typedef unspecified_type | Ray_3
| Ray type.
typedef unspecified_type | Line_3
| Line type.
typedef unspecified_type | Vector_3
| Vector type.
typedef unspecified_type | Sphere_3
| Sphere type.
typedef unspecified_type | Iso_cuboid_3
| Iso cuboid type.
typedef unspecified_type | Compute_scalar_product_3
| Model of `Kernel::ComputeScalarProduct_3`.
typedef unspecified_type | Compute_squared_distance_3
| Model of `Kernel::ComputeSquaredDistance_3`.
typedef unspecified_type | Compute_squared_radius_3
| Model of `Kernel::ComputeSquaredRadius_3`.
typedef unspecified_type | Construct_center_3
| Model of `Kernel::ConstructCenter_3`.
typedef unspecified_type | Construct_midpoint_3
| Model of `Kernel::ConstructMidpoint_3`.
typedef unspecified_type | Construct_point_on_3
| Model of `Kernel::ConstructPoint_3`.
typedef unspecified_type | Construct_segment_3
| Model of `Kernel::ConstructSegment_3`.
typedef unspecified_type | Construct_scaled_vector_3
| Model of `Kernel::ConstructScaledVector_3`.
typedef unspecified_type | Construct_translated_point_3
| Model of `Kernel::ConstructTranslatedPoint_3`.
typedef unspecified_type | Construct_vector_3
| Model of `Kernel::ConstructVertex_3`.
typedef unspecified_type | Has_on_bounded_side_3
| Model of `Kernel::HasOnBoundedSide_3`.

## Operations
The following functions give access to the predicate and construction objects:
Compute_scalar_product_3 | compute_scalar_product_3_object ()
Compute_squared_distance_3 | compute_squared_distance_3_object ()
Compute_squared_radius_3 | compute_squared_radius_3_object ()
Construct_center_3 | construct_center_3_object ()
Construct_midpoint_3 | construct_midpoint_3_object ()
Construct_point_on_3 | construct_point_on_3_object ()
Construct_scaled_vector_3 | construct_scaled_vector_3_object ()
Construct_segment_3 | construct_segment_3_object ()
Construct_translated_point_3 | construct_translated_point_3_object ()
Construct_vector_3 | construct_vector_3_object ()
Has_on_bounded_side_3 | has_on_bounded_side_3_object ()

## Member Typedef Documentation

## ◆ Compute_scalar_product_3

typedef unspecified_type BisectionGeometricTraits_3::Compute_scalar_product_3

Model of `Kernel::ComputeScalarProduct_3`.

That function object must provide the operator:

- `FT operator()(Vector_3 v, Vector_3 w)` which returns the scalar (inner) product of the two vectors `v` and `w`.

## ◆ Compute_squared_distance_3

typedef unspecified_type BisectionGeometricTraits_3::Compute_squared_distance_3

Model of `Kernel::ComputeSquaredDistance_3`.

That function object must provide the operator:

- `FT operator()(Point_3, Point_3)` which returns the squared distance between two points.

## ◆ Compute_squared_radius_3

typedef unspecified_type BisectionGeometricTraits_3::Compute_squared_radius_3

Model of `Kernel::ComputeSquaredRadius_3`.

That function object must provide the operator:

- `FT operator()(Sphere_3 s)` which returns the squared radius of `s`.

## ◆ Construct_center_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_center_3

Model of `Kernel::ConstructCenter_3`.

That function object must provide the operator:

- `Point_3 operator()(Sphere_3 s)` which returns the center of the sphere `s`.

## ◆ Construct_midpoint_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_midpoint_3

Model of `Kernel::ConstructMidpoint_3`.

That function object must provide the operator:

- `Point_3 operator()(Point_3 p, Point_3 q)` which computes the midpoint of the segment `pq`.

## ◆ Construct_point_on_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_point_on_3

Model of `Kernel::ConstructPoint_3`.

That function object must provide the following operators:

- `Point_3 operator()(Line_3 l,int i)` which returns an arbitrary point on `l`. It holds `point(i) == point(j)`, iff `i==j`. Furthermore, is directed from `point(i)` to `point(j)`, for all `i` < `j`.
- `Point_3 operator()(Ray_3 r,int i)` which returns a point on `r`. `point(0)` is the source, `point(i)`, with \( i>0\), is different from the source.
  Precondition
    \( i \geq0\).
- `Point_3 operator()(Segment_3 s,int i)` which returns either source or target of `s`: `point(0)` returns the source of `s`, `point(1)` returns the target of `s`. Parameter `i` is taken modulo 2, which gives easy access to the other end point.

## ◆ Construct_scaled_vector_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_scaled_vector_3

Model of `Kernel::ConstructScaledVector_3`.

That function object must provide the operator:

- `Vector_3 operator()(Vector_3 v, FT scale)` which returns the vector `v` scaled by a factor `scale`.

## ◆ Construct_segment_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_segment_3

Model of `Kernel::ConstructSegment_3`.

That function object must provide the operator:

- `Segment_3 operator()(Point_3 p, Point_3 q)` which returns a segment with source `p` and target `q`, directed from the source to the target.

## ◆ Construct_translated_point_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_translated_point_3

Model of `Kernel::ConstructTranslatedPoint_3`.

That function object must provide the operator:

- `Point_3 operator()(Point_3 p, Vector_3 v)` which returns the point obtained by translating `p` by the vector `v`.

## ◆ Construct_vector_3

typedef unspecified_type BisectionGeometricTraits_3::Construct_vector_3

Model of `Kernel::ConstructVertex_3`.

That function object must provide the operator:

- `Vector_3 operator()(Point_3 a, Point_3 b)` which returns the vector `b-a`.

## ◆ FT

typedef unspecified_type BisectionGeometricTraits_3::FT

Numerical type.

Must be a model of `FieldNumberType` and `FieldWithSqrt`, and constructible from a `double`.

## ◆ Has_on_bounded_side_3

typedef unspecified_type BisectionGeometricTraits_3::Has_on_bounded_side_3

Model of `Kernel::HasOnBoundedSide_3`.

That function object must provide the operator:

- `bool operator()(Sphere_3 s, Point_3 p)` which returns `true` iff `p` lies on the bounded side of `s`.

## ◆ Point_3

typedef unspecified_type BisectionGeometricTraits_3::Point_3

The point type.

Must have a constructor `Point_3(FT, FT, FT)`.