Detailed Description

A NurbsSurfaceMesh is a kind of Geometry.

We can navigate the NurbsSurfaceMesh using the generic terms such as Facets or Points or we can choose to use navigate using terms that are specific to the NurbsSurfaceMesh such as NurbsSurfaces, ControlPoints. There are some functions that do not fit with a generic terms such as Knots, which are specific to NURBS, this is why there are specific terms as well as generic terms.

See also:: Primitive::GetGeometry, X3DObject::AddGeometry, X3DObject::AddNurbsSurfaceMesh

Example:

        using namespace XSI;

        Application app;
        Model root = app.GetActiveSceneRoot();

        X3DObject mySphere;
        root.AddGeometry( L"Sphere", L"NurbsSurface", L"", mySphere );

        NurbsSurfaceMesh mySurfaceMesh(mySphere.GetActivePrimitive().GetGeometry());

#include <xsi_nurbssurfacemesh.h>

Inheritance diagram for NurbsSurfaceMesh:

[legend]

List of all members.

Public Member Functions
	NurbsSurfaceMesh ()
	~NurbsSurfaceMesh ()
	NurbsSurfaceMesh (const CRef &in_ref)
	NurbsSurfaceMesh (const NurbsSurfaceMesh &in_obj)
	NurbsSurfaceMesh (const Geometry &in_obj)
bool	IsA (siClassID in_ClassID) const
siClassID	GetClassID () const
NurbsSurfaceMesh &	operator= (const NurbsSurfaceMesh &in_obj)
NurbsSurfaceMesh &	operator= (const Geometry &in_geom)
NurbsSurfaceMesh &	operator= (const CRef &in_ref)
CNurbsSurfaceRefArray	GetSurfaces () const
CStatus	GetClosestSurfacePosition (MATH::CVector3 &in_vPosition, LONG &out_lSurfaceIndex, double &out_dSquaredDistance, double &out_dUValue, double &out_dVValue, MATH::CVector3 &out_vPosition) const
CStatus	Get (siNurbsFormat in_siNurbsFormat, CNurbsSurfaceDataArray &out_surfaces) const
CStatus	Set (const CNurbsSurfaceDataArray &in_surfaces, siNurbsFormat in_siNurbsFormat=siSINurbs)
CStatus	AddSurfaceWithTrim (const CNurbsSurfaceData &in_surface, const CTrimCurveDataArray &in_trims, siNurbsFormat in_siNurbsFormat, NurbsSurface &out_Surface)
CStatus	AddSurface (const CNurbsSurfaceData &in_surface, siNurbsFormat in_siNurbsFormat, NurbsSurface &out_Surface)
CStatus	GetSubSurfaceIndexArray (const PointLocatorData &in_ptLocators, LONG in_nbPointLocatorsIndices, const LONG in_pPointLocatorsIndices, LONG out_pIndices) const
CStatus	GetNormalizedUVArray (const PointLocatorData &in_ptLocators, LONG in_nbPointLocatorsIndices, const LONG in_pPointLocatorsIndices, float out_pNormalizedUVs) const
PointLocatorData	ConstructPointLocators (LONG in_nbPointLocators, const LONG in_pSubSurfaceIndices, const float in_pNormalizedUVs) const

Constructor & Destructor Documentation

NurbsSurfaceMesh ( )

Default constructor.

~NurbsSurfaceMesh ( )

Default destructor.

NurbsSurfaceMesh ( const CRef & in_ref )

Constructor.

Parameters:

in_ref constant reference object.

NurbsSurfaceMesh ( const NurbsSurfaceMesh & in_obj )

Copy constructor.

Parameters:

in_obj constant class object.

NurbsSurfaceMesh ( const Geometry & in_obj )

Copy constructor.

Parameters:

in_obj Geometry object.

Member Function Documentation

bool IsA ( siClassID in_ClassID ) const [virtual]

Returns true if a given class type is compatible with this API class.

Parameters:

in_ClassID class type.

Returns:: true if the class is compatible, false otherwise.

Reimplemented from Geometry.

siClassID GetClassID ( ) const [virtual]

Returns the type of the API class.

Returns:: The class type.

Reimplemented from Geometry.

NurbsSurfaceMesh& operator= ( const NurbsSurfaceMesh & in_obj )

Creates an object from another object. The newly created object is set to empty if the input object is not compatible.

Parameters:

in_obj constant class object.

Returns:: The new NurbsCurveList object.

NurbsSurfaceMesh& operator= ( const Geometry & in_geom )

Creates a Polygon object from a Geometry object. The newly created object is set to empty if the input Geometry object is not compatible.

Parameters:

in_geom constant class object.

Returns:: The new NurbsCurveList object.

Reimplemented from Geometry.

NurbsSurfaceMesh& operator= ( const CRef & in_ref )

Creates an object from a reference object. The newly created object is set to empty if the input reference object is not compatible.

Parameters:

in_ref constant class object.

Returns:: The new NurbsCurveList object.

Reimplemented from Geometry.

CNurbsSurfaceRefArray GetSurfaces ( ) const

Returns an array of all NurbsSurface objects on this NurbsSurfaceMesh object.

Returns:: A NurbsSurface array.

CStatus GetClosestSurfacePosition	(	MATH::CVector3 &	in_vPosition,
		LONG &	out_lSurfaceIndex,
		double &	out_dSquaredDistance,
		double &	out_dUValue,
		double &	out_dVValue,
		MATH::CVector3 &	out_vPosition
	)		const

Returns the surface index, position of the point on it, UV values and distance from the given position.

Parameters:

in_vPosition A position expressed in the NurbsSurfaceMesh object frame of reference.

Return values:

out_lSurfaceIndex	The surface index to which the position is the closest.
out_dSquaredDistance	The distance of the input position to the curve point.
out_dUValue	The corresponding UValue on the NurbsSurface.
out_dVValue	The corresponding VValue on the NurbsSurface.
out_vPosition	The actual curve point position at U value.

Returns:: CStatus::OK success; CStatus::Fail other failure

CStatus Get	(	siNurbsFormat	in_siNurbsFormat,
		CNurbsSurfaceDataArray &	out_surfaces
	)		const

Returns a complete data description of a nurbs surface mesh.

Parameters:

in_siNurbsFormat Specifies how the data is formatted.

Return values:

out_surfaces The data description of all surfaces.

Returns:: CStatus::OK success; CStatus::Fail other failure

CStatus Set	(	const CNurbsSurfaceDataArray &	in_surfaces,
		siNurbsFormat	in_siNurbsFormat = `siSINurbs`
	)

Sets from a complete data description of the nurbs surface mesh. This is only available from compiled operators. For non-compiled operators this property can only be set if the object has been frozen.

Note:: If you use this function on an object with clusters and you change the topology the burden of updating the clusters is on the user.

Parameters:

in_surfaces	NurbsSurfaces data description.
in_siNurbsFormat	Specifies how the data is formatted.

Returns:: CStatus::OK success; CStatus::AccessDenied function used outside of a plug-in operator context.

CStatus AddSurfaceWithTrim	(	const CNurbsSurfaceData &	in_surface,
		const CTrimCurveDataArray &	in_trims,
		siNurbsFormat	in_siNurbsFormat,
		NurbsSurface &	out_Surface
	)

Adds a trimmed surface to the mesh.

Parameters:

in_surface	The surface descriptsion
in_trims	The trims data that will apply to this surface.
in_siNurbsFormat	The format of representation for the nurbs data.

Return values:

out_Surface The newly created surface.

Returns:: CStatus::OK success; CStatus::AccessDenied function used outside of a plug-in operator context.

CStatus AddSurface	(	const CNurbsSurfaceData &	in_surface,
		siNurbsFormat	in_siNurbsFormat,
		NurbsSurface &	out_Surface
	)

Adds a surface to the mesh.

Parameters:

in_surface	The surface description
in_siNurbsFormat	The format of representation for the nurbs data.

Return values:

out_Surface The newly created surface.

Returns:: CStatus::OK success; CStatus::AccessDenied function used outside of a plug-in operator context.

CStatus GetSubSurfaceIndexArray	(	const PointLocatorData &	in_ptLocators,
		LONG	in_nbPointLocatorsIndices,
		const LONG *	in_pPointLocatorsIndices,
		LONG *	out_pIndices
	)		const

Returns the subsurface indices on which point locators are defined. Notice that this information is part of the NURBS surface mesh point locator's definition, and depends on the topology only (won't change if the geometry is deformed).

The normalized UV parameters within the subsurface can be queried with NurbsSurfaceMesh::GetNormalizedUVArray.

Parameters:

in_ptLocators	Contains the point locations to be queried.
in_nbPointLocatorsIndices	Number of point locators to be queried (-1 if all)
in_pPointLocatorsIndices	Point locator indices to be queried (not used if in_nbPointLocatorsIndices is -1)

Return values:

out_pIndices Returned subsurface indices. Size must be in_ptLocators.GetCount() if in_nbPointLocatorsIndices is -1, in_nbPointLocatorsIndices otherwise.

Returns:: CStatus::OK success; CStatus::Fail failure

See also:: NurbsSurfaceMesh::GetNormalizedUVArray, NurbsSurfaceMesh::ConstructPointLocators

Since:: 5.0

Example:: This example topologically describes the point locators resulting from the shrink-wrapping of a cube onto a NURBS surface sphere.

        using namespace XSI;
        Application app;
        Model root = app.GetActiveSceneRoot();

        X3DObject meshCubeObj;
        root.AddGeometry( L"Cube", L"MeshSurface", L"", meshCubeObj );
        PolygonMesh meshCubeGeom( meshCubeObj.GetActivePrimitive().GetGeometry() );

        X3DObject NURBSSphereObj;
        root.AddGeometry( L"Sphere", L"NurbsSurface", L"", NURBSSphereObj );
        NurbsSurfaceMesh NURBSSphereGeom( NURBSSphereObj.GetActivePrimitive().GetGeometry() );

        MATH::CVector3Array posArray = meshCubeGeom.GetPoints().GetPositionArray();
        PointLocatorData cubeOnSpherePointLocators = NURBSSphereGeom.GetClosestLocations(posArray.GetCount(), (double*)&posArray[0]);

        LONG i;
        for(i = 0; i < cubeOnSpherePointLocators.GetCount(); i++)
        {
            LONG subsurface;
            NURBSSphereGeom.GetSubSurfaceIndexArray(
                            cubeOnSpherePointLocators,
                            1, &i, &subsurface);
            float UVs[2];
            NURBSSphereGeom.GetNormalizedUVArray(
                            cubeOnSpherePointLocators,
                            1, &i, UVs);
            app.LogMessage(L"Point locator " + CString(CValue(i)) + L" is on subsurface " + CString(CValue(subsurface)) +
                            L" at {U = " + CString(CValue(UVs[0])) + L" , V = " + CString(CValue(UVs[1])) + L"}.");
        }
        //Expected results:
        //INFO : Point locator 0 is on subsurface 0 at {U = 1.35528e-016 , V = 0.30423}.
        //INFO : Point locator 1 is on subsurface 0 at {U = 0.75 , V = 0.304065}.
        //INFO : Point locator 2 is on subsurface 0 at {U = 2.45219e-017 , V = 0.695454}.
        //etc.

CStatus GetNormalizedUVArray	(	const PointLocatorData &	in_ptLocators,
		LONG	in_nbPointLocatorsIndices,
		const LONG *	in_pPointLocatorsIndices,
		float *	out_pNormalizedUVs
	)		const

Returns the normalized UV surface parameters defining point locators. Notice that this information is part of NURBS surface mesh point locator's definition, and depends on the topology only (won't change if the geometry is deformed).

The subsurface index on which the normalized UVs apply can be queried with NurbsSurfaceMesh::GetSubSurfaceIndexArray.

Parameters:

in_ptLocators	Contains the point locations to be queried.
in_nbPointLocatorsIndices	Number of point locators to be queried (-1 if all)
in_pPointLocatorsIndices	Point locator indices to be queried (not used if in_nbPointLocatorsIndices is -1)

Return values:

out_pNormalizedUVs Returned UV normalized values. Size must be 2*in_ptLocators.GetCount() if in_nbPointLocatorsIndices is -1, 2*in_nbPointLocatorsIndices otherwise.

Returns:: CStatus::OK success; CStatus::Fail failure

See also:: NurbsSurfaceMesh::GetSubSurfaceIndexArray, NurbsSurfaceMesh::ConstructPointLocators

Since:: 5.0

Example:: Another example using this function can be found in NurbsSurfaceMesh::GetSubSurfaceIndexArray method's description.

Example:: This example creates point locators at random surface locations, and positions a Null at each of these point locators.

        using namespace XSI;

        void CreateNullsAtPointLocations( X3DObject& inObj, const PointLocatorData& inPointLocators )
        {
            Geometry geom( inObj.GetActivePrimitive().GetGeometry() );

            std::vector<double> posData, normData;
            posData.resize(inPointLocators.GetCount()*3);
            normData.resize(inPointLocators.GetCount()*3);

            geom.EvaluatePositions(inPointLocators, -1, 0, &posData.front());
            geom.EvaluateNormals(inPointLocators, siInterpolatedVertexGeometricNormals, -1, 0, &normData.front());

            MATH::CVector3 trans;
            MATH::CRotation rot;

            LONG i;
            for (i = 0; i < (LONG)posData.size(); i+=3)
            {
                Null nullObj;
                inObj.AddNull(L"",nullObj);

                trans.Set(posData[i], posData[i+1], posData[i+2]);
                nullObj.PutLocalTranslation(trans);

                trans.Set(normData[i], normData[i+1], normData[i+2]);
                rot.SetFromXYZAxes( trans, trans, trans );
                nullObj.PutLocalRotation(rot);
            }
        }

        float GetNormalizedRandom(){return float(rand())/RAND_MAX;}

        LONG RandInRange(LONG in_bound)
        {
            float fRand = GetNormalizedRandom()*0.99999f;
            return (LONG)(in_bound*fRand);
        }

        void main()
        {
            Application app;
            Model root = app.GetActiveSceneRoot();

            X3DObject NURBSSphereObj;
            root.AddGeometry( L"Sphere", L"NurbsSurface", L"", NURBSSphereObj );
            NurbsSurfaceMesh NURBSSphereGeom( NURBSSphereObj.GetActivePrimitive().GetGeometry() );

            LONG nbPtLocators = 50;

            std::vector<LONG> subSurfaceIndexArray;
            std::vector<float> normalizedUVArray;

            subSurfaceIndexArray.resize(nbPtLocators);
            normalizedUVArray.resize(nbPtLocators*2);

            LONG i;
            for(i = 0; i < nbPtLocators; i++)
            {
                subSurfaceIndexArray[i] = 0;
                normalizedUVArray[i*2] = NormalizedRand();
                normalizedUVArray[i*2+1] = NormalizedRand();
            }
            PointLocatorData randomPointLocators = NURBSSphereGeom.ConstructPointLocators(nbPtLocators, &subSurfaceIndexArray.front(), &normalizedUVArray.front());

            CreateNullsAtPointLocations(NURBSSphereObj, randomPointLocators);
        }

PointLocatorData ConstructPointLocators	(	LONG	in_nbPointLocators,
		const LONG *	in_pSubSurfaceIndices,
		const float *	in_pNormalizedUVs
	)		const

Builds a PointLocatorData from NurbsSurfaceMesh-specific topological information. Subsurface indices and normalized UV surface parameters are required in order to define each point locator. The UV array should contain two values for each specified subsurface index.

Notice that the returned point locators can be evaluated on any NurbsSurfaceMesh instance having the same topology.

Parameters:

in_nbPointLocators	Number of points locators to be constructed
in_pSubSurfaceIndices	Subsurface indices (size must be in_nbPoints)
in_pNormalizedUVs	Normalized UV coordinates on the subsurface (size must be in_nbPoints*2)

Returns:: A new PointLocatorData object (.IsValid() == false if failed)

See also:: NurbsSurfaceMesh::GetNormalizedUVArray, NurbsSurfaceMesh::GetSubSurfaceIndexArray, Geometry::GetSurfacePointLocatorsFromPoints, PolygonMesh::ConstructPointLocators

Since:: 5.0

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

xsi_nurbssurfacemesh.h

Detailed Description

Public Member Functions

Constructor & Destructor Documentation

Member Function Documentation