AZ::Intersect::SegmentTriangleHitTester Class Reference

#include <IntersectSegment.h>

Public Member Functions
	SegmentTriangleHitTester (const AZ::Vector3 &p, const AZ::Vector3 &q)
bool	IntersectSegmentTriangleCCW (const AZ::Vector3 &a, const AZ::Vector3 &b, const AZ::Vector3 &c, AZ::Vector3 &normal, float &t) const
bool	IntersectSegmentTriangle (const AZ::Vector3 &a, const AZ::Vector3 &b, const AZ::Vector3 &c, AZ::Vector3 &normal, float &t) const
AZ::Vector3	GetIntersectionPoint (float t) const

Detailed Description

SegmentTriangleHitTester is an optimized form of "watertight" segment/triangle collisions that is designed to compare a single segment against multiple triangles. Construction of the class pre-computes information about the segment itself so that each triangle intersection API call can perform less setup work. Usage: SegmentTriangleHitTester hitTester(rayStart, rayEnd); for (auto& tri : triangles) if (hitTester.IntersectSegmentTriangle(tri.a, tri.b, tri.c, outNormal, outT)) hitPoint = rayStart + (rayEnd - rayStart) * outT;

Constructor & Destructor Documentation

SegmentTriangleHitTester()

AZ::Intersect::SegmentTriangleHitTester::SegmentTriangleHitTester	(	const AZ::Vector3 &	p,
		const AZ::Vector3 &	q
	)

Construct a hit tester for segment pq that can be used to compare against multiple triangles.

Parameters

p	Segment start point.
q	Segment end point.

Member Function Documentation

GetIntersectionPoint()

AZ::Vector3 AZ::Intersect::SegmentTriangleHitTester::GetIntersectionPoint ( float  t ) const

inline

Gets the segment intersection point for a given Time of intersection 't'.

Parameters

t	Time of intersection along the segment [0.0 (p), 1.0 (q)].

Returns

The point on the segment where the intersection occurred.

IntersectSegmentTriangle()

bool AZ::Intersect::SegmentTriangleHitTester::IntersectSegmentTriangle ( const AZ::Vector3 &  a, const AZ::Vector3 &  b, const AZ::Vector3 &  c, AZ::Vector3 &  normal, float &  t  ) const

inline

Same as IntersectSegmentTriangleCCW without respecting the triangle (a,b,c) vertex order (i.e. double sided).

Parameters

a	Triangle vertex 1.
b	Triangle vertex 2.
c	Triangle vertex 3.
normal	Triangle normal at the intersection point if segment intersects triangle.
t	Time of intersection along the segment [0.0 (p), 1.0 (q)] if segment intersects triangle.

Returns

true if the segment intersects the triangle otherwise false.

IntersectSegmentTriangleCCW()

bool AZ::Intersect::SegmentTriangleHitTester::IntersectSegmentTriangleCCW ( const AZ::Vector3 &  a, const AZ::Vector3 &  b, const AZ::Vector3 &  c, AZ::Vector3 &  normal, float &  t  ) const

inline

For the given segment pq and a triangle abc (CCW), returns whether the segment intersects the triangle and if so, also returns the time of intersection along the segment and the triangle normal.

Parameters

a	Triangle vertex 1.
b	Triangle vertex 2.
c	Triangle vertex 3.
normal	Triangle normal at the intersection point if segment intersects triangle.
t	Time of intersection along the segment [0.0 (p), 1.0 (q)] if segment intersects triangle.

Returns

true if the segment intersects the triangle otherwise false.

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The documentation for this class was generated from the following file:

• Code/Framework/AzCore/AzCore/Math/IntersectSegment.h