#include <MNurbsIntersector.h>
Nurbs intersector.
The MNurbsIntersector class contains methods for efficiently finding the closest point to a NURBS surface. A treebased algorithm is used to find the closest point.
The create() method builds the internal data required for the algorithm. As a result, calls to it should be minimized as it is a heavy operation. If the NURBS surface or matrix changes, you will need to recreate the tree based data to correspond, again using the create() method.
This class is not threadsafe.
Public Member Functions  
MNurbsIntersector (void)  
Constructor.  
virtual  ~MNurbsIntersector (void) 
Destructor.  
MStatus  create (MObject &nurbsObject, const MMatrix &matrix=MMatrix::identity) 
This method creates the data required by the intersector. More...  
bool  isCreated (void) const 
This method returns true if the intersector is created. More...  
MStatus  getClosestPoint (const MPoint &point, MPointOnNurbs &nurbsPoint, double maxDistance=DBL_MAX) const 
This method finds the closest point. More...  
MStatus  getIntersects (const MPoint &rayStartingPoint, const MVector &alongThisDirection, MDoubleArray &uArray, MDoubleArray &vArray, MPointArray &points, double tolerance) const 
This method finds all the points of intersection of the NURBS surface with a ray (a vector at a point). More...  
MStatus  getIntersect (const MPoint &rayStartingPoint, const MVector &alongThisDirection, double &u, double &v, MPoint &pntOfIntersection, double tolerance) const 
This method finds the first point of intersection of the NURBS surface with a ray (a vector at a point). More...  
Static Public Member Functions  
static const char *  className () 
Returns the name of this class. More...  
MStatus create  (  MObject &  nurbsObject, 
const MMatrix &  matrix = MMatrix::identity 

) 
This method creates the data required by the intersector.
It is a heavy operation that should be called only when necessary, such as when the underlying NURBS surface or the matrix changes.
[in]  nurbsObject  a NURBS surface object . 
[in]  matrix  specify the mapping to apply for transforming points that are specified in the getClosestPoint method into the object space of the NURBS surface. 
bool isCreated  (  void  )  const 
This method returns true if the intersector is created.
False is returned otherwise.
MStatus getClosestPoint  (  const MPoint &  point, 
MPointOnNurbs &  nurbsPoint,  
double  maxDistance = DBL_MAX 

)  const 
This method finds the closest point.
Information is returned in the nurbsPoint object.
[in]  point  Specifies the location for which to evaluate the closest point on the NURBS surface. `point' is transformed using the matrix parameter passed to the create() method, so for example if your matrix maps world to object space, then `point' should be specified in world space. 
[out]  nurbsPoint  Resulting closest point in object space. 
[in]  maxDistance  Maximum distance to consider in object space. 
MStatus getIntersects  (  const MPoint &  rayStartingPoint, 
const MVector &  alongThisDirection,  
MDoubleArray &  uArray,  
MDoubleArray &  vArray,  
MPointArray &  points,  
double  tolerance  
)  const 
This method finds all the points of intersection of the NURBS surface with a ray (a vector at a point).
The points are returned in the points object, and the U and V parameters of the points are returned in the uArray and vArray objects respectively.
[in]  rayStartingPoint  Starting location of ray to test 
[in]  alongThisDirection  Direction of ray to test 
[in]  uArray  U parameters of intersection (if any) 
[in]  vArray  V parameters of intersection (if any) 
[out]  points  Storage for points of intersection (if any) 
[in]  tolerance  The epsilon value in the calculation 
MStatus getIntersect  (  const MPoint &  rayStartingPoint, 
const MVector &  alongThisDirection,  
double &  u,  
double &  v,  
MPoint &  pntOfIntersection,  
double  tolerance  
)  const 
This method finds the first point of intersection of the NURBS surface with a ray (a vector at a point).
The point is returned in the pntOfIntersection object, and the U and V parameters of the point are returned in the u and v variables respectively.
[in]  rayStartingPoint  Starting location of ray to test 
[in]  alongThisDirection  Direction of ray to test 
[in]  u  U parameter of intersection (if any) 
[in]  v  V parameter of intersection (if any) 
[out]  pntOfIntersection  Storage for closest point of intersection (if any) 
[in]  tolerance  The epsilon value in the calculation 

static 
Returns the name of this class.