PolygonIntersection Namespace Reference

Classes
struct	Cube
struct	Edge

Functions
std::vector< QVector3D >	calcPolygon (QVector4D normal, Cube &cube, int index)
bool	inside (QVector3D vertex, QVector4D normal)
bool	cross (QVector3D a, QVector3D b, QVector4D normal)
QVector3D	intersect (QVector3D a, QVector3D b, QVector4D normal)
QVector3D	interpolate (QVector3D a, QVector3D b, float t)

Function Documentation

calcPolygon()

std::vector< QVector3D > PolygonIntersection::calcPolygon	(	QVector4D	normal,
		Cube &	cube,
		int	index
	)

Calculates the intersection points between a cube and a plane

Parameters

normal	plane equation
cube	the cube to intersect with
index	holds the index for which edge ordering should be used

Returns

a list of points ordered (counter-)clockwise

cross()

bool PolygonIntersection::cross	(	QVector3D	a,
		QVector3D	b,
		QVector4D	normal
	)

checks if a line segment intersects a plane

Parameters

a	first point of line segment
b	second point of line segment
normal	plane equation

Returns

true if line segment intersects the plane, false otherwise

inside()

bool PolygonIntersection::inside	(	QVector3D	vertex,
		QVector4D	normal
	)

tests if a point lies infront or behind a plane

Parameters

vertex	vertex to be tested
normal	plane equation

Returns

true if vertex lies infront of plane, false otherwise

interpolate()

QVector3D PolygonIntersection::interpolate	(	QVector3D	a,
		QVector3D	b,
		float	t
	)

interpolates two vectors

Parameters

a	first vector
b	second vector
t	interpolation value

Returns

interpolated vector

intersect()

QVector3D PolygonIntersection::intersect	(	QVector3D	a,
		QVector3D	b,
		QVector4D	normal
	)

calculates the intersection point of a line segment and a plane call this method only if cross(a, b, normal) returns true;

Parameters

a	first point of line segment
b	second point of line segment
normal	plane equation

Returns

intersection point