#include <vtkSelectPolyData.h>
Inheritance diagram for vtkSelectPolyData:
Public Methods | |
virtual const char * | GetClassName () |
virtual int | IsA (const char *type) |
void | PrintSelf (ostream &os, vtkIndent indent) |
virtual void | SetGenerateSelectionScalars (int) |
virtual int | GetGenerateSelectionScalars () |
virtual void | GenerateSelectionScalarsOn () |
virtual void | GenerateSelectionScalarsOff () |
virtual void | SetInsideOut (int) |
virtual int | GetInsideOut () |
virtual void | InsideOutOn () |
virtual void | InsideOutOff () |
virtual void | SetLoop (vtkPoints *) |
virtual vtkPoints * | GetLoop () |
virtual void | SetSelectionMode (int) |
virtual int | GetSelectionMode () |
void | SetSelectionModeToSmallestRegion () |
void | SetSelectionModeToLargestRegion () |
void | SetSelectionModeToClosestPointRegion () |
const char * | GetSelectionModeAsString () |
virtual void | SetGenerateUnselectedOutput (int) |
virtual int | GetGenerateUnselectedOutput () |
virtual void | GenerateUnselectedOutputOn () |
virtual void | GenerateUnselectedOutputOff () |
vtkPolyData * | GetUnselectedOutput () |
vtkPolyData * | GetSelectionEdges () |
unsigned long int | GetMTime () |
void | UnRegister (vtkObject *o) |
virtual int | InRegisterLoop (vtkObject *) |
Static Public Methods | |
vtkSelectPolyData * | New () |
int | IsTypeOf (const char *type) |
vtkSelectPolyData * | SafeDownCast (vtkObject *o) |
Protected Methods | |
vtkSelectPolyData () | |
~vtkSelectPolyData () | |
vtkSelectPolyData (const vtkSelectPolyData &) | |
void | operator= (const vtkSelectPolyData &) |
void | Execute () |
Protected Attributes | |
int | GenerateSelectionScalars |
int | InsideOut |
vtkPoints * | Loop |
int | SelectionMode |
float | ClosestPoint [3] |
int | GenerateUnselectedOutput |
vtkPolyData * | UnselectedOutput |
vtkPolyData * | SelectionEdges |
vtkSelectPolyData is a filter that selects polygonal data based on defining a "loop" and indicating the region inside of the loop. The mesh within the loop consists of complete cells (the cells are not cut). Alternatively, this filter can be used to generate scalars. These scalar values, which are a distance measure to the loop, can be used to clip, contour. or extract data (i.e., anything that an implicit function can do).
The loop is defined by an array of x-y-z point coordinates. (Coordinates should be in the same coordinate space as the input polygonal data.) The loop can be concave and non-planar, but not self-intersecting. The input to the filter is a polygonal mesh (only surface primitives such as triangle strips and polygons); the output is either a) a portion of the original mesh laying within the selection loop (GenerateSelectionScalarsOff); or b) the same polygonal mesh with the addition of scalar values (GenerateSelectionScalarsOn).
The algorithm works as follows. For each point coordinate in the loop, the closest point in the mesh is found. The result is a loop of closest point ids from the mesh. Then, the edges in the mesh connecting the closest points (and laying along the lines forming the loop) are found. A greedy edge tracking procedure is used as follows. At the current point, the mesh edge oriented in the direction of and whose end point is closest to the line is chosen. The edge is followed to the new end point, and the procedure is repeated. This process continues until the entire loop has been created.
To determine what portion of the mesh is inside and outside of the loop, three options are possible. 1) the smallest connected region, 2) the largest connected region, and 3) the connected region closest to a user specified point. (Set the ivar SelectionMode.)
Once the loop is computed as above, the GenerateSelectionScalars controls the output of the filter. If on, then scalar values are generated based on distance to the loop lines. Otherwise, the cells laying inside the selection loop are output. By default, the mesh lying within the loop is output; however, if InsideOut is on, then the portion of the mesh lying outside of the loop is output.
The filter can be configured to generate the unselected portions of the mesh as output by setting GenerateUnselectedOutput. Use the method GetUnselectedOutput to access this output. (Note: this flag is pertinent only when GenerateSelectionScalars is off.)
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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 vtkPolyDataToPolyDataFilter. |
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Return this object's modified time. Reimplemented from vtkObject. |
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Return the (mesh) edges of the selection region. |
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Return the method of determining in/out of loop as a string. |
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Return output that hasn't been selected (if GenreateUnselectedOutput is enabled). |
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Test to see if this object is in a reference counting loop. Reimplemented from vtkSource. |
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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 vtkPolyDataToPolyDataFilter. |
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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 vtkPolyDataToPolyDataFilter. |
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Instantiate object with InsideOut turned off, and GenerateSelectionScalars turned off. The unselected output is not generated, and the inside mode is the smallest region. Reimplemented from vtkPolyDataSource. |
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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. |
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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 vtkPolyDataToPolyDataFilter. |
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Set/Get the flag to control behavior of the filter. If GenerateSelectionScalars is on, then the output of the filter is the same as the input, except that scalars are generated. If off, the filter outputs the cells laying inside the loop, and does not generate scalars. |
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Control whether a second output is generated. The second output contains the polygonal data that's not been selected. |
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Set/Get the InsideOut flag. When off, the mesh within the loop is extracted. When on, the mesh outside the loop is extracted. |
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Set/Get the array of point coordinates defining the loop. There must be at least three points used to define a loop. |
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Control how inside/outside of loop is defined. |
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Handle the source/data loop. Reimplemented from vtkSource. |