The ray forms (see RayForm) of the mesh SDFs. TriMeshSDF: its BVH walked along the ray (PackedBVH::traverse() with BVH::RayQuery), and its triangles crossed exactly (TriangleRay::crossing()). MeshSDF: the same walk, its polygon faces crossed exactly (DCEL::FaceT::rayCrossing()). FlatMeshSDF: every face, without a BVH. With this header included, firstHit() and intersects() on a mesh SDF are exact instead of marched, and so are compositions of mesh SDFs (see EBGeometry_CSGRayForms.hpp), through spans(): the crossings along the ray, nearest first, paired into spans by the side of the face the ray crosses from. A closed mesh is needed for the spans to mean inside and outside. More...

#include <cstddef>
#include <cstdint>
#include "EBGeometry_MeshDistanceFunctions.hpp"
#include "EBGeometry_Ray.hpp"

Include dependency graph for EBGeometry_MeshRayForms.hpp:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Classes
struct	EBGeometry::RayForm< TriMeshSDF< T, K, W > >
	TriMeshSDF's ray form: the nearest triangle the ray crosses, found by walking the BVH nearest box first and stopping at boxes farther than the nearest crossing so far. Exact, and callable on a device. More...

struct	EBGeometry::RayForm< MeshSDF< T, K > >
	MeshSDF's ray form: the nearest polygon face the ray crosses, found by walking the BVH nearest box first and stopping at boxes farther than the nearest crossing so far. Exact, and callable on a device. More...

struct	EBGeometry::RayForm< FlatMeshSDF< T > >
	FlatMeshSDF's ray form: every face tested, as FlatMeshSDF's signed distance tests every face (no BVH). Exact, and callable on a device; as for MeshSDF otherwise. More...

struct	EBGeometry::RayDetail::NearestCrossings< T >
	The nearest crossings of a mesh along a ray, in order, as a BVH walk finds them: at most Capacity, enough for the spans a list holds and one more. More...

struct	EBGeometry::RayDetail::NearestCrossings< T >::Crossing
	A crossing. More...

Namespaces
namespace	EBGeometry
	Namespace containing all of EBGeometry's functionality.

Functions
template<class T >
HitT< T >	EBGeometry::RayDetail::faceHit (const RayT< T > &a_ray, const T a_t, const uint32_t a_face, const Vec3T< T > &a_normal) noexcept
	A crossing of a mesh face as a HitT.

Detailed Description

The ray forms (see RayForm) of the mesh SDFs. TriMeshSDF: its BVH walked along the ray (PackedBVH::traverse() with BVH::RayQuery), and its triangles crossed exactly (TriangleRay::crossing()). MeshSDF: the same walk, its polygon faces crossed exactly (DCEL::FaceT::rayCrossing()). FlatMeshSDF: every face, without a BVH. With this header included, firstHit() and intersects() on a mesh SDF are exact instead of marched, and so are compositions of mesh SDFs (see EBGeometry_CSGRayForms.hpp), through spans(): the crossings along the ray, nearest first, paired into spans by the side of the face the ray crosses from. A closed mesh is needed for the spans to mean inside and outside.

Author: Robert Marskar

Function Documentation

◆ faceHit()

template<class T >

HitT< T > EBGeometry::RayDetail::faceHit	(	const RayT< T > &	a_ray,
		const T	a_t,
		const uint32_t	a_face,
		const Vec3T< T > &	a_normal
	)

inlinenoexcept

A crossing of a mesh face as a HitT.

Internal helper; not part of the public API.

Template Parameters

T	Floating-point precision.

Parameters

[in]	a_ray	Ray.
[in]	a_t	Distance along the ray, or +infinity for none.
[in]	a_face	The face's id.
[in]	a_normal	The face's outward unit normal.

Returns: The hit, or a miss.

Classes

Namespaces

Functions

Detailed Description

Function Documentation

◆ faceHit()