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vtkTensorGlyph Class Reference
scale and orient glyph according to tensor eigenvalues and eigenvectors.
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#include <vtkTensorGlyph.h>
Inheritance diagram for vtkTensorGlyph:
[legend]Collaboration diagram for vtkTensorGlyph:
[legend]List of all members.
Detailed Description
scale and orient glyph according to tensor eigenvalues and eigenvectors.
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Date:
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2000/12/10 20:08:55
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Revision:
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1.33
vtkTensorGlyph is a filter that copies a geometric representation (specified as polygonal data) to every input point. The geometric representation, or glyph, can be scaled and/or rotated according to the tensor at the input point. Scaling and rotation is controlled by the eigenvalues/eigenvectors of the tensor as follows. For each tensor, the eigenvalues (and associated eigenvectors) are sorted to determine the major, medium, and minor eigenvalues/eigenvectors. The major eigenvalue scales the glyph in the x-direction, the medium in the y-direction, and the minor in the z-direction. Then, the glyph is rotated so that the glyph's local x-axis lies along the major eigenvector, y-axis along the medium eigenvector, and z-axis along the minor.
A scale factor is provided to control the amount of scaling. Also, you can turn off scaling completely if desired. The boolean variable ClampScaling controls the maximum scaling (in conjunction with MaxScaleFactor.) This is useful in certain applications where singularities or large order of magnitude differences exist in the eigenvalues.
Another instance variable, ExtractEigenvalues, has been provided to control extraction of eigenvalues/eigenvectors. If this boolean is false, then eigenvalues/eigenvectors are not extracted, and the columns of the tensor are taken as the eigenvectors (norm of column is eigenvalue). This allows additional capability over the vtkGlyph3D object. That is, the glyph can be oriented in three directions instead of one.
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See also:
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vtkGlyph3D vtkPointLoad vtkHyperStreamline
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Examples:
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vtkTensorGlyph (examples)
Definition at line 83 of file vtkTensorGlyph.h.
Constructor & Destructor Documentation
| vtkTensorGlyph::vtkTensorGlyph |
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| vtkTensorGlyph::~vtkTensorGlyph |
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| vtkTensorGlyph::vtkTensorGlyph |
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const vtkTensorGlyph & |
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Member Function Documentation
| virtual const char* vtkTensorGlyph::GetClassName |
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| int vtkTensorGlyph::IsTypeOf |
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const char * |
type |
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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 vtkDataSetToPolyDataFilter. |
| virtual int vtkTensorGlyph::IsA |
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const char * |
type |
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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 vtkDataSetToPolyDataFilter. |
| vtkTensorGlyph* vtkTensorGlyph::SafeDownCast |
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vtkObject * |
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| void vtkTensorGlyph::PrintSelf |
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ostream & |
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vtkIndent |
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Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.
Reimplemented from vtkSource. |
| vtkTensorGlyph* vtkTensorGlyph::New |
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Construct object with scaling on and scale factor 1.0. Eigenvalues are extracted, glyphs are colored with input scalar data, and logarithmic scaling is turned off.
Reimplemented from vtkPolyDataSource. |
| void vtkTensorGlyph::SetSource |
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vtkPolyData * |
source |
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Specify the geometry to copy to each point. |
| virtual void vtkTensorGlyph::SetScaling |
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int |
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Turn on/off scaling of glyph with eigenvalues. |
| virtual int vtkTensorGlyph::GetScaling |
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| virtual void vtkTensorGlyph::ScalingOn |
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| virtual void vtkTensorGlyph::ScalingOff |
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| virtual void vtkTensorGlyph::SetScaleFactor |
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float |
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Specify scale factor to scale object by. (Scale factor always affects output even if scaling is off.) |
| virtual float vtkTensorGlyph::GetScaleFactor |
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| virtual void vtkTensorGlyph::SetExtractEigenvalues |
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int |
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Turn on/off extraction of eigenvalues from tensor. |
| virtual void vtkTensorGlyph::ExtractEigenvaluesOn |
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| virtual void vtkTensorGlyph::ExtractEigenvaluesOff |
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[virtual] |
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| virtual int vtkTensorGlyph::GetExtractEigenvalues |
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[virtual] |
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| virtual void vtkTensorGlyph::SetColorGlyphs |
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int |
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Turn on/off coloring of glyph with input scalar data. If false, or input scalar data not present, then the scalars from the source object are passed through the filter. |
| virtual int vtkTensorGlyph::GetColorGlyphs |
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| virtual void vtkTensorGlyph::ColorGlyphsOn |
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| virtual void vtkTensorGlyph::ColorGlyphsOff |
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| virtual void vtkTensorGlyph::SetClampScaling |
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int |
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Turn on/off scalar clamping. If scalar clamping is on, the ivar MaxScaleFactor is used to control the maximum scale factor. (This is useful to prevent uncontrolled scaling near singularities.) |
| virtual int vtkTensorGlyph::GetClampScaling |
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| virtual void vtkTensorGlyph::ClampScalingOn |
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| virtual void vtkTensorGlyph::ClampScalingOff |
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[virtual] |
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| virtual void vtkTensorGlyph::SetMaxScaleFactor |
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float |
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Set/Get the maximum allowable scale factor. This value is compared to the combination of the scale factor times the eigenvalue. If less, the scale factor is reset to the MaxScaleFactor. The boolean ClampScaling has to be "on" for this to work. |
| virtual float vtkTensorGlyph::GetMaxScaleFactor |
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| void vtkTensorGlyph::operator= |
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const vtkTensorGlyph & |
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[inline, protected] |
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| void vtkTensorGlyph::Execute |
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[protected, virtual] |
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Member Data Documentation
int vtkTensorGlyph::Scaling [protected]
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float vtkTensorGlyph::ScaleFactor [protected]
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int vtkTensorGlyph::ExtractEigenvalues [protected]
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int vtkTensorGlyph::ColorGlyphs [protected]
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int vtkTensorGlyph::ClampScaling [protected]
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float vtkTensorGlyph::MaxScaleFactor [protected]
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The documentation for this class was generated from the following file:
Generated on Wed Nov 21 13:00:45 2001 for VTK by
1.2.11.1 written by Dimitri van Heesch,
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