Irrlicht 3D Engine
irr::core::triangle3d< T > Class Template Reference

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

#include <triangle3d.h>

Public Member Functions

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

Public Attributes

vector3d< T > pointA
 the three points of the triangle More...
 
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

§ triangle3d() [1/2]

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

Constructor for an all 0 triangle.

Definition at line 25 of file triangle3d.h.

§ triangle3d() [2/2]

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

§ closestPointOnTriangle()

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.

§ getArea()

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

Get the area of the triangle.

Definition at line 224 of file triangle3d.h.

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

§ getIntersectionOfPlaneWithLine()

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 169 of file triangle3d.h.

References irr::core::vector3d< T >::dotProduct(), irr::core::triangle3d< T >::getNormal(), irr::core::iszero(), irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, irr::core::triangle3d< T >::pointC, irr::core::vector3d< T >::X, irr::core::vector3d< T >::Y, and irr::core::vector3d< T >::Z.

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

§ getIntersectionWithLimitedLine()

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 136 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.

§ getIntersectionWithLine()

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 154 of file triangle3d.h.

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

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

§ getNormal()

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 199 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().

§ getPlane()

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

Get the plane of this triangle.

Definition at line 218 of file triangle3d.h.

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

§ isFrontFacing()

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 210 of file triangle3d.h.

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

§ isPointInside()

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

§ isPointInsideFast()

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 108 of file triangle3d.h.

References irr::core::vector3d< T >::dotProduct(), irr::core::triangle3d< T >::pointA, irr::core::triangle3d< T >::pointB, irr::core::triangle3d< T >::pointC, and irr::core::ROUNDING_ERROR_f32.

§ isTotalInsideBox()

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.

§ isTotalOutsideBox()

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.

§ operator!=()

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.

§ operator==()

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

§ set()

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 231 of file triangle3d.h.

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

Member Data Documentation

§ pointA

§ pointB

§ pointC


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