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irr::core::triangle3d< T > Class Template Reference

3d triangle template class for doing collision detection and other things. More...

#include <triangle3d.h>

List of all members.

Public Member Functions

core::vector3d< T > closestPointOnTriangle (const core::vector3d< T > &p) const
 Get the closest point on a triangle to a point on the same plane.
getArea () const
 Get the area of the triangle.
bool getIntersectionOfPlaneWithLine (const vector3d< T > &linePoint, const vector3d< T > &lineVect, vector3d< T > &outIntersection) const
 Calculates the intersection between a 3d line and the plane the triangle is on.
bool getIntersectionWithLimitedLine (const line3d< T > &line, vector3d< T > &outIntersection) const
 Get an intersection with a 3d line.
bool getIntersectionWithLine (const vector3d< T > &linePoint, const vector3d< T > &lineVect, vector3d< T > &outIntersection) const
 Get an intersection with a 3d line.
vector3d< T > getNormal () const
 Get the normal of the triangle.
plane3d< T > getPlane () const
 Get the plane of this triangle.
bool isFrontFacing (const vector3d< T > &lookDirection) const
 Test if the triangle would be front or backfacing from any point.
bool isPointInside (const vector3d< T > &p) const
 Check if a point is inside the triangle (border-points count also as inside)
bool isPointInsideFast (const vector3d< T > &p) const
 Check if a point is inside the triangle (border-points count also as inside)
bool isTotalInsideBox (const aabbox3d< T > &box) const
 Determines if the triangle is totally inside a bounding box.
bool isTotalOutsideBox (const aabbox3d< T > &box) const
 Determines if the triangle is totally outside a bounding box.
bool operator!= (const triangle3d< T > &other) const
 Inequality operator.
bool operator== (const triangle3d< T > &other) const
 Equality operator.
void set (const core::vector3d< T > &a, const core::vector3d< T > &b, const core::vector3d< T > &c)
 sets the triangle's points
 triangle3d ()
 Constructor for an all 0 triangle.
 triangle3d (vector3d< T > v1, vector3d< T > v2, vector3d< T > v3)
 Constructor for triangle with given three vertices.

Public Attributes

vector3d< T > pointA
 the three points of the triangle
vector3d< T > pointB
vector3d< T > pointC

Detailed Description

template<class T>
class irr::core::triangle3d< T >

3d triangle template class for doing collision detection and other things.

Definition at line 20 of file triangle3d.h.


Constructor & Destructor Documentation

template<class T>
irr::core::triangle3d< T >::triangle3d ( ) [inline]

Constructor for an all 0 triangle.

Definition at line 25 of file triangle3d.h.

template<class T>
irr::core::triangle3d< T >::triangle3d ( vector3d< T >  v1,
vector3d< T >  v2,
vector3d< T >  v3 
) [inline]

Constructor for triangle with given three vertices.

Definition at line 27 of file triangle3d.h.


Member Function Documentation

template<class T>
core::vector3d<T> irr::core::triangle3d< T >::closestPointOnTriangle ( const core::vector3d< T > &  p) const [inline]

Get the closest point on a triangle to a point on the same plane.

Parameters:
pPoint which must be on the same plane as the triangle.
Returns:
The closest point of the triangle

Definition at line 68 of file triangle3d.h.

References irr::core::vector3d< T >::getDistanceFrom(), irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

template<class T>
T irr::core::triangle3d< T >::getArea ( ) const [inline]

Get the area of the triangle.

Definition at line 209 of file triangle3d.h.

References irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

template<class T>
bool irr::core::triangle3d< T >::getIntersectionOfPlaneWithLine ( const vector3d< T > &  linePoint,
const vector3d< T > &  lineVect,
vector3d< T > &  outIntersection 
) const [inline]

Calculates the intersection between a 3d line and the plane the triangle is on.

Parameters:
lineVectVector of the line to intersect with.
linePointPoint of the line to intersect with.
outIntersectionPlace to store the intersection point, if there is one.
Returns:
True if there was an intersection, else false.

Definition at line 166 of file triangle3d.h.

References irr::core::vector3d< T >::dotProduct(), irr::core::triangle3d< T >::getNormal(), irr::core::iszero(), and irr::core::triangle3d< T >::pointA.

Referenced by irr::core::triangle3d< T >::getIntersectionWithLine().

template<class T>
bool irr::core::triangle3d< T >::getIntersectionWithLimitedLine ( const line3d< T > &  line,
vector3d< T > &  outIntersection 
) const [inline]

Get an intersection with a 3d line.

Parameters:
lineLine to intersect with.
outIntersectionPlace to store the intersection point, if there is one.
Returns:
True if there was an intersection, false if not.

Definition at line 133 of file triangle3d.h.

References irr::core::line3d< T >::end, irr::core::triangle3d< T >::getIntersectionWithLine(), irr::core::line3d< T >::getVector(), irr::core::vector3d< T >::isBetweenPoints(), and irr::core::line3d< T >::start.

template<class T>
bool irr::core::triangle3d< T >::getIntersectionWithLine ( const vector3d< T > &  linePoint,
const vector3d< T > &  lineVect,
vector3d< T > &  outIntersection 
) const [inline]

Get an intersection with a 3d line.

Please note that also points are returned as intersection which are on the line, but not between the start and end point of the line. If you want the returned point be between start and end use getIntersectionWithLimitedLine().

Parameters:
linePointPoint of the line to intersect with.
lineVectVector of the line to intersect with.
outIntersectionPlace to store the intersection point, if there is one.
Returns:
True if there was an intersection, false if there was not.

Definition at line 151 of file triangle3d.h.

References irr::core::triangle3d< T >::getIntersectionOfPlaneWithLine(), and irr::core::triangle3d< T >::isPointInside().

Referenced by irr::core::triangle3d< T >::getIntersectionWithLimitedLine().

template<class T>
vector3d<T> irr::core::triangle3d< T >::getNormal ( ) const [inline]

Get the normal of the triangle.

Please note: The normal is not always normalized.

Definition at line 184 of file triangle3d.h.

References irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

Referenced by irr::core::triangle3d< T >::getIntersectionOfPlaneWithLine(), and irr::core::triangle3d< T >::isFrontFacing().

template<class T>
plane3d<T> irr::core::triangle3d< T >::getPlane ( ) const [inline]

Get the plane of this triangle.

Definition at line 203 of file triangle3d.h.

References irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

template<class T>
bool irr::core::triangle3d< T >::isFrontFacing ( const vector3d< T > &  lookDirection) const [inline]

Test if the triangle would be front or backfacing from any point.

Thus, this method assumes a camera position from which the triangle is definitely visible when looking at the given direction. Do not use this method with points as it will give wrong results!

Parameters:
lookDirectionLook direction.
Returns:
True if the plane is front facing and false if it is backfacing.

Definition at line 195 of file triangle3d.h.

References irr::core::vector3d< T >::dotProduct(), F32_LOWER_EQUAL_0, and irr::core::triangle3d< T >::getNormal().

template<class T>
bool irr::core::triangle3d< T >::isPointInside ( const vector3d< T > &  p) const [inline]

Check if a point is inside the triangle (border-points count also as inside)

NOTE: When working with T='int' you should prefer isPointInsideFast, as isPointInside will run into number-overflows already with coordinates in the 3-digit-range.

Parameters:
pPoint to test. Assumes that this point is already on the plane of the triangle.
Returns:
True if the point is inside the triangle, otherwise false.

Definition at line 90 of file triangle3d.h.

References irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

Referenced by irr::core::triangle3d< T >::getIntersectionWithLine().

template<class T>
bool irr::core::triangle3d< T >::isPointInsideFast ( const vector3d< T > &  p) const [inline]

Check if a point is inside the triangle (border-points count also as inside)

This method uses a barycentric coordinate system. It is faster than isPointInside but is more susceptible to floating point rounding errors. This will especially be noticable when the FPU is in single precision mode (which is for example set on default by Direct3D).

Parameters:
pPoint to test. Assumes that this point is already on the plane of the triangle.
Returns:
True if point is inside the triangle, otherwise false.

Definition at line 105 of file triangle3d.h.

References irr::core::vector3d< T >::dotProduct(), irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

template<class T>
bool irr::core::triangle3d< T >::isTotalInsideBox ( const aabbox3d< T > &  box) const [inline]

Determines if the triangle is totally inside a bounding box.

Parameters:
boxBox to check.
Returns:
True if triangle is within the box, otherwise false.

Definition at line 44 of file triangle3d.h.

References irr::core::aabbox3d< T >::isPointInside(), irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

template<class T>
bool irr::core::triangle3d< T >::isTotalOutsideBox ( const aabbox3d< T > &  box) const [inline]

Determines if the triangle is totally outside a bounding box.

Parameters:
boxBox to check.
Returns:
True if triangle is outside the box, otherwise false.

Definition at line 54 of file triangle3d.h.

References irr::core::aabbox3d< T >::MaxEdge, irr::core::aabbox3d< T >::MinEdge, irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.

template<class T>
bool irr::core::triangle3d< T >::operator!= ( const triangle3d< T > &  other) const [inline]

Inequality operator.

Definition at line 36 of file triangle3d.h.

template<class T>
bool irr::core::triangle3d< T >::operator== ( const triangle3d< T > &  other) const [inline]
template<class T>
void irr::core::triangle3d< T >::set ( const core::vector3d< T > &  a,
const core::vector3d< T > &  b,
const core::vector3d< T > &  c 
) [inline]

sets the triangle's points

Definition at line 216 of file triangle3d.h.

References irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, and irr::core::triangle3d< T >::pointC.


Member Data Documentation

template<class T>
vector3d<T> irr::core::triangle3d< T >::pointA
template<class T>
vector3d<T> irr::core::triangle3d< T >::pointB
template<class T>
vector3d<T> irr::core::triangle3d< T >::pointC

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

The Irrlicht Engine
The Irrlicht Engine Documentation © 2003-2010 by Nikolaus Gebhardt. Generated on Thu May 31 2012 10:57:46 by Doxygen (1.7.6.1)