implicit function for a selection loop More...
#include <vtkImplicitSelectionLoop.h>
Detailed Description
implicit function for a selection loop
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).
- See also:
- vtkImplicitFunction vtkImplicitBoolean vtkExtractGeometry vtkClipPolyData vtkConnectivityFilter vtkPolyDataConnectivityFilter
Definition at line 59 of file vtkImplicitSelectionLoop.h.
Member Typedef Documentation
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
Definition at line 64 of file vtkImplicitSelectionLoop.h.
Constructor & Destructor Documentation
| vtkImplicitSelectionLoop::vtkImplicitSelectionLoop | ( | ) | [protected] |
| vtkImplicitSelectionLoop::~vtkImplicitSelectionLoop | ( | ) | [protected] |
Member Function Documentation
| static int vtkImplicitSelectionLoop::IsTypeOf | ( | const char * | type | ) | [static] |
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
| virtual int vtkImplicitSelectionLoop::IsA | ( | const char * | type | ) | [virtual] |
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
| static vtkImplicitSelectionLoop* vtkImplicitSelectionLoop::SafeDownCast | ( | vtkObjectBase * | o | ) | [static] |
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
| virtual vtkObjectBase* vtkImplicitSelectionLoop::NewInstanceInternal | ( | ) | const [protected, virtual] |
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
| void vtkImplicitSelectionLoop::PrintSelf | ( | ostream & | os, |
| vtkIndent | indent | ||
| ) | [virtual] |
Standard VTK methods for printing and type information.
Reimplemented from vtkImplicitFunction.
| static vtkImplicitSelectionLoop* vtkImplicitSelectionLoop::New | ( | ) | [static] |
Instantiate object with no initial loop.
Reimplemented from vtkObject.
| double vtkImplicitSelectionLoop::EvaluateFunction | ( | double | x[3] | ) | [virtual] |
Evaluate selection loop returning a signed distance.
Implements vtkImplicitFunction.
| double vtkImplicitSelectionLoop::EvaluateFunction | ( | double | x, |
| double | y, | ||
| double | z | ||
| ) | [inline] |
Evaluate selection loop returning a signed distance.
Reimplemented from vtkImplicitFunction.
Definition at line 74 of file vtkImplicitSelectionLoop.h.
| void vtkImplicitSelectionLoop::EvaluateGradient | ( | double | x[3], |
| double | n[3] | ||
| ) | [virtual] |
Evaluate selection loop returning the gradient.
Implements vtkImplicitFunction.
| virtual void vtkImplicitSelectionLoop::SetLoop | ( | vtkPoints * | ) | [virtual] |
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 | ( | ) | [virtual] |
Set/Get the array of point coordinates defining the loop. There must be at least three points used to define a loop.
| virtual void vtkImplicitSelectionLoop::SetAutomaticNormalGeneration | ( | int | ) | [virtual] |
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 | ( | ) | [virtual] |
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 void vtkImplicitSelectionLoop::AutomaticNormalGenerationOn | ( | ) | [virtual] |
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 void vtkImplicitSelectionLoop::AutomaticNormalGenerationOff | ( | ) | [virtual] |
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 void vtkImplicitSelectionLoop::SetNormal | ( | double | , |
| double | , | ||
| double | |||
| ) | [virtual] |
Set / get the normal used to determine whether a point is inside or outside the selection loop.
| virtual void vtkImplicitSelectionLoop::SetNormal | ( | double | [3] | ) | [virtual] |
Set / get the normal used to determine whether a point is inside or outside the selection loop.
| virtual double* vtkImplicitSelectionLoop::GetNormal | ( | ) | [virtual] |
Set / get the normal used to determine whether a point is inside or outside the selection loop.
| virtual void vtkImplicitSelectionLoop::GetNormal | ( | double | data[3] | ) | [virtual] |
Set / get the normal used to determine whether a point is inside or outside the selection loop.
| unsigned long vtkImplicitSelectionLoop::GetMTime | ( | ) | [virtual] |
Overload GetMTime() because we depend on the Loop
Reimplemented from vtkImplicitFunction.
Member Data Documentation
vtkPoints* vtkImplicitSelectionLoop::Loop [protected] |
Definition at line 111 of file vtkImplicitSelectionLoop.h.
double vtkImplicitSelectionLoop::Normal[3] [protected] |
Definition at line 112 of file vtkImplicitSelectionLoop.h.
Definition at line 113 of file vtkImplicitSelectionLoop.h.
The documentation for this class was generated from the following file:
- dox/Common/DataModel/vtkImplicitSelectionLoop.h
