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vtkLoopSubdivisionFilter Class Reference

generate a subdivision surface using the Loop Scheme. More...

#include <vtkLoopSubdivisionFilter.h>

Inheritance diagram for vtkLoopSubdivisionFilter:

[legend]Collaboration diagram for vtkLoopSubdivisionFilter:

[legend]List of all members.

[NOHEADER]
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
vtkLoopSubdivisionFilter *	New ()
int	IsTypeOf (const char *type)
vtkLoopSubdivisionFilter *	SafeDownCast (vtkObject *o)
Protected Methods
	vtkLoopSubdivisionFilter ()
	~vtkLoopSubdivisionFilter ()
void	GenerateSubdivisionPoints (vtkPolyData *inputDS, vtkIntArray *edgeData, vtkPoints *outputPts, vtkPointData *outputPD)
void	GenerateEvenStencil (vtkIdType p1, vtkPolyData *polys, vtkIdList *stencilIds, float *weights)
void	GenerateOddStencil (vtkIdType p1, vtkIdType p2, vtkPolyData *polys, vtkIdList *stencilIds, float *weights)
void	ComputeInputUpdateExtents (vtkDataObject *output)

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Detailed Description

generate a subdivision surface using the Loop Scheme.

Date:

2001/10/11 13:37:08

Revision:

1.11

Thanks:

This work was supported bt PHS Research Grant No. 1 P41 RR13218-01 from the National Center for Research Resources

vtkLoopSubdivisionFilter is an approximating subdivision scheme that creates four new triangles for each triangle in the mesh. The user can specify the NumberOfSubdivisions. Loop's subdivision scheme is described in: Loop, C., "Smooth Subdivision surfaces based on triangles,", Masters Thesis, University of Utah, August 1987. For a nice summary of the technique see, Hoppe, H., et. al, "Piecewise Smooth Surface Reconstruction,:, Proceedings of Siggraph 94 (Orlando, Florida, July 24-29, 1994). In COmputer Graphics Proceedings, Annual COnference Series, 1994, ACM SIGGRAPH, pp. 295-302.

The filter only operates on triangles. Users should use the vtkTriangleFilter to triangulate meshes that contain polygons or triangle strips.

The filter approximates point data using the same scheme. New triangles create at a subdivision step will have the cell data of their parent cell.

See also:

vtkApproximatingSubdivisionFilter

Tests:

vtkLoopSubdivisionFilter (Tests)

Definition at line 82 of file vtkLoopSubdivisionFilter.h.

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Constructor & Destructor Documentation

vtkLoopSubdivisionFilter::vtkLoopSubdivisionFilter (    )  [inline, protected]

Definition at line 92 of file vtkLoopSubdivisionFilter.h.

vtkLoopSubdivisionFilter::~vtkLoopSubdivisionFilter (    )  [inline, protected]

Definition at line 93 of file vtkLoopSubdivisionFilter.h.

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Member Function Documentation

vtkLoopSubdivisionFilter* vtkLoopSubdivisionFilter::New (    )  [static]

Construct object with NumberOfSubdivisions set to 1. Reimplemented from vtkPolyDataSource.

virtual const char* vtkLoopSubdivisionFilter::GetClassName (    )  [virtual]

Return the class name as a string. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkApproximatingSubdivisionFilter.

int vtkLoopSubdivisionFilter::IsTypeOf (  const char *    type )  [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkApproximatingSubdivisionFilter.

virtual int vtkLoopSubdivisionFilter::IsA (  const char *    type )  [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkApproximatingSubdivisionFilter.

vtkLoopSubdivisionFilter* vtkLoopSubdivisionFilter::SafeDownCast (  vtkObject *    o )  [static]

Will cast the supplied object to vtkObject* is this is a safe operation (i.e., a safe downcast); otherwise NULL is returned. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h. Reimplemented from vtkApproximatingSubdivisionFilter.

void vtkLoopSubdivisionFilter::GenerateSubdivisionPoints (  vtkPolyData *    inputDS, vtkIntArray *    edgeData, vtkPoints *    outputPts, vtkPointData *    outputPD )  [protected, virtual]

Reimplemented from vtkApproximatingSubdivisionFilter.

void vtkLoopSubdivisionFilter::GenerateEvenStencil (  vtkIdType    p1, vtkPolyData *    polys, vtkIdList *    stencilIds, float *    weights )  [protected]

void vtkLoopSubdivisionFilter::GenerateOddStencil (  vtkIdType    p1, vtkIdType    p2, vtkPolyData *    polys, vtkIdList *    stencilIds, float *    weights )  [protected]

void vtkLoopSubdivisionFilter::ComputeInputUpdateExtents (  vtkDataObject *    output )  [protected, virtual]

What is the input update extent that is required to produce the desired output? By default, the whole input is always required but this is overridden in many subclasses. Reimplemented from vtkPolyDataSource.

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

• Graphics/vtkLoopSubdivisionFilter.h

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