MMeshIntersector Class Reference

This reference page is linked to from the following overview topics: スレッド化と Maya.

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Detailed Description

Mesh intersector.

The MMeshIntersector class contains methods for efficiently finding the closest point to a mesh. An octree 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.

This class allows multiple threads to evaluate closest points simultaneously as the method getClosestPoint is threadsafe.

Examples:

closestPointCmd.cpp.

#include <MMeshIntersector.h>

List of all members.

Public Member Functions
	MMeshIntersector (void)
	Constructor.
virtual	~MMeshIntersector (void)
	Destructor.
MStatus	create (MObject &meshObject, const MMatrix &matrix=MMatrix::identity)
	This method creates the data required by the intersector.
bool	isCreated (void)
	This method returns true if the intersector is created.
MStatus	getClosestPoint (MPoint &point, MPointOnMesh &meshPoint, double maxDistance=DBL_MAX)
	This method finds the closest point.
Static Public Member Functions
static const char *	className ()
	Returns the name of this class.

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Member Function Documentation

MStatus create	(	MObject &	meshObject,
		const MMatrix &	matrix = MMatrix::identity
	)

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This method creates the data required by the intersector.

It is a heavy operation that should be called only when necessary.

Parameters:

[in]	meshObject	a kMesh or kMeshData object
[in]	matrix	specify the mapping to apply for transforming points that are specified in the getClosestPoint method into the object space of the mesh.

Returns:

Status code

Status Codes:

• MS::kSuccess The mesh intersector was created
• MS::kInvalidParameter object is not a kMesh or kMeshData
• MS::kFailure other internal failure

Examples:

closestPointCmd.cpp.

bool isCreated

(

void

)

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This method returns true if the intersector is created.

False is return otherwise.

MStatus getClosestPoint	(	MPoint &	point,
		MPointOnMesh &	meshPoint,
		double	maxDistance = DBL_MAX
	)

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This method finds the closest point.

Information is returned in the meshPoint object.

This method is threadsafe.

Parameters:

[in]	point	Specifies the location for which to evaluate the closest point on the mesh. `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]	meshPoint	Resulting closest point in object space.
[in]	maxDistance	Maximum distance to consider in object space.

Returns:

Status code

Status Codes:

• MS::kSuccess The mesh point was found
• MS::kFailure object error, create not called

Examples:

closestPointCmd.cpp.

const char * className

(

)

[static]

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Returns the name of this class.

Returns:

Name of this class.