G3D::MeshAlg::Face Class Reference

Oriented, indexed triangle. More...

Public Member Functions
	Face ()
bool	containsDirectedEdge (int e) const
	Contains the forward edge e if e >= 0 and the backward edge ~e otherwise. More...
bool	containsEdge (int e) const
bool	containsVertex (int v) const

Public Attributes
int	edgeIndex [3]
	Edge indices in counter-clockwise order. More...
int	vertexIndex [3]
	Vertices in the face in counter-clockwise order. More...

Static Public Attributes
static const int	NONE
	Used by Edge::faceIndex to indicate a missing face. More...

Detailed Description

Oriented, indexed triangle.

Constructor & Destructor Documentation

Face()

G3D::MeshAlg::Face::Face

(

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Member Function Documentation

containsDirectedEdge()

bool G3D::MeshAlg::Face::containsDirectedEdge ( int  e ) const

inline

Contains the forward edge e if e >= 0 and the backward edge ~e otherwise.

containsEdge()

bool G3D::MeshAlg::Face::containsEdge ( int  e ) const

inline

containsVertex()

bool G3D::MeshAlg::Face::containsVertex ( int  v ) const

inline

Member Data Documentation

edgeIndex

int G3D::MeshAlg::Face::edgeIndex[3]

Edge indices in counter-clockwise order.

Edges are undirected, so it is important to know which way each edge is pointing in a face. This is encoded using negative indices.

If edgeIndex[i] >= 0 then this face contains the directed edge between vertex indices
edgeArray[face.edgeIndex[i]].vertexIndex[0] and edgeArray[face.edgeIndex[i]].vertexIndex[1].

If edgeIndex[i] < 0 then ~edgeIndex[i] (i.e. the two's complement of) is used and this face contains the directed edge between vertex indices edgeArray[~face.edgeIndex[i]].vertexIndex[0] and edgeArray[~face.edgeIndex[i]].vertexIndex[1].

Degenerate faces may include the same edge multiple times.

Referenced by containsDirectedEdge(), and containsEdge().

NONE

const int G3D::MeshAlg::Face::NONE

static

Used by Edge::faceIndex to indicate a missing face.

This is a large negative value.

Referenced by G3D::MeshAlg::Edge::boundary().

vertexIndex

int G3D::MeshAlg::Face::vertexIndex[3]

Vertices in the face in counter-clockwise order.

Degenerate faces may include the same vertex multiple times.

Referenced by containsVertex().