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vtkImplicitSelectionLoop Class Reference
implicit function for a selection loop.
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#include <vtkImplicitSelectionLoop.h>
Inheritance diagram for vtkImplicitSelectionLoop:
[legend]Collaboration diagram for vtkImplicitSelectionLoop:
[legend]List of all members.
Detailed Description
implicit function for a selection loop.
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Date:
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2000/12/10 20:08:39
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Revision:
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1.14
vtkImplicitSelectionLoop computes the implicit function value and function gradient for a irregular, cylinder-like object whose cross section is defined by a set of points forming a loop. The loop need not be convex nor its points coplanar. However, the loop must be non-self-intersecting when projected onto the plane defined by the accumulated cross product around the loop (i.e., the axis of the loop). (Alternatively, you can specify the normal to use.)
The following procedure is used to compute the implicit function value for a point x. Each point of the loop is first projected onto the plane defined by the loop normal. This forms a polygon. Then, to evaluate the implicit function value, inside/outside tests are used to determine if x is inside the polygon, and the distance to the loop boundary is computed (negative values are inside the loop).
One example application of this implicit function class is to draw a loop on the surface of a mesh, and use the loop to clip or extract cells from within the loop. Remember, the selection loop is "infinite" in length, you can use a plane (in boolean combination) to cap the extent of the selection loop. Another trick is to use a connectivity filter to extract the closest region to a given point (i.e., one of the points used to define the selection loop).
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See also:
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vtkImplicitFunction vtkImplicitBoolean vtkExtractGeometry vtkClipPolyData vtkConnectivityFilter vtkPolyDataConnectivityFilter
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Examples:
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vtkImplicitSelectionLoop (examples)
Definition at line 83 of file vtkImplicitSelectionLoop.h.
Constructor & Destructor Documentation
| vtkImplicitSelectionLoop::vtkImplicitSelectionLoop |
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[protected] |
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| vtkImplicitSelectionLoop::~vtkImplicitSelectionLoop |
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[protected] |
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| vtkImplicitSelectionLoop::vtkImplicitSelectionLoop |
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const vtkImplicitSelectionLoop & |
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[inline, protected] |
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Member Function Documentation
| virtual const char* vtkImplicitSelectionLoop::GetClassName |
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[virtual] |
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| int vtkImplicitSelectionLoop::IsTypeOf |
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const char * |
type |
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[static] |
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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 vtkImplicitFunction. |
| virtual int vtkImplicitSelectionLoop::IsA |
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const char * |
type |
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[virtual] |
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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 vtkImplicitFunction. |
| vtkImplicitSelectionLoop* vtkImplicitSelectionLoop::SafeDownCast |
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vtkObject * |
o |
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[static] |
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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 vtkImplicitFunction. |
| void vtkImplicitSelectionLoop::PrintSelf |
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ostream & |
os, |
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vtkIndent |
indent |
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[virtual] |
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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 vtkImplicitFunction. |
| vtkImplicitSelectionLoop* vtkImplicitSelectionLoop::New |
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[static] |
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Instantiate object with no initial loop.
Reimplemented from vtkObject. |
| float vtkImplicitSelectionLoop::EvaluateFunction |
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float |
x[3] |
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[virtual] |
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| float vtkImplicitSelectionLoop::EvaluateFunction |
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float |
x, |
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float |
y, |
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float |
z |
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[inline] |
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| void vtkImplicitSelectionLoop::EvaluateGradient |
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float |
x[3], |
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float |
n[3] |
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[virtual] |
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| virtual void vtkImplicitSelectionLoop::SetLoop |
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vtkPoints * |
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[virtual] |
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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. |
| virtual vtkPoints* vtkImplicitSelectionLoop::GetLoop |
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[virtual] |
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| virtual void vtkImplicitSelectionLoop::SetAutomaticNormalGeneration |
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int |
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[virtual] |
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Turn on/off automatic normal generation. By default, the normal is computed from the accumulated cross product of the edges. You can also specify the normal to use. |
| virtual int vtkImplicitSelectionLoop::GetAutomaticNormalGeneration |
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[virtual] |
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| virtual void vtkImplicitSelectionLoop::AutomaticNormalGenerationOn |
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[virtual] |
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| virtual void vtkImplicitSelectionLoop::AutomaticNormalGenerationOff |
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[virtual] |
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| virtual void vtkImplicitSelectionLoop::SetNormal |
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float |
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float |
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float |
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[virtual] |
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Set / get the normal used to determine what is inside and what is outside. |
| virtual void vtkImplicitSelectionLoop::SetNormal |
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float |
[3] |
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[virtual] |
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| virtual float* vtkImplicitSelectionLoop::GetNormal |
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[virtual] |
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| virtual void vtkImplicitSelectionLoop::GetNormal |
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float |
data[3] |
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[virtual] |
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| unsigned long vtkImplicitSelectionLoop::GetMTime |
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[virtual] |
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| void vtkImplicitSelectionLoop::operator= |
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const vtkImplicitSelectionLoop & |
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[inline, protected] |
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Member Data Documentation
vtkPoints* vtkImplicitSelectionLoop::Loop [protected]
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float vtkImplicitSelectionLoop::Normal[3] [protected]
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int vtkImplicitSelectionLoop::AutomaticNormalGeneration [protected]
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The documentation for this class was generated from the following file:
Generated on Wed Nov 21 12:49:11 2001 for VTK by
1.2.11.1 written by Dimitri van Heesch,
© 1997-2001