Objects that compute geometry-based error during cell tessellation according to some max angle.
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#include <vtkSmoothErrorMetric.h>
Inherits vtkGenericSubdivisionErrorMetric.
Objects that compute geometry-based error during cell tessellation according to some max angle.
It is a concrete error metric, based on a geometric criterium: a max angle between the chord passing through the midpoint and one of the endpoints and the other chord passing through the midpoint and the other endpoint of the edge. It is related to the flatness of an edge.
- See Also
- vtkGenericCellTessellator vtkGenericSubdivisionErrorMetric
- Tests:
- vtkSmoothErrorMetric (Tests)
Definition at line 41 of file vtkSmoothErrorMetric.h.
vtkSmoothErrorMetric::vtkSmoothErrorMetric |
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virtual vtkSmoothErrorMetric::~vtkSmoothErrorMetric |
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protectedvirtual |
Construct the error metric with a default flatness threshold of 90.1 degrees.
static int vtkSmoothErrorMetric::IsTypeOf |
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const char * |
type | ) |
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static |
Standard VTK type and error macros.
virtual int vtkSmoothErrorMetric::IsA |
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const char * |
type | ) |
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virtual |
Standard VTK type and error macros.
Standard VTK type and error macros.
virtual vtkObjectBase* vtkSmoothErrorMetric::NewInstanceInternal |
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const |
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Standard VTK type and error macros.
Standard VTK type and error macros.
void vtkSmoothErrorMetric::PrintSelf |
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ostream & |
os, |
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vtkIndent |
indent |
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Standard VTK type and error macros.
double vtkSmoothErrorMetric::GetAngleTolerance |
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Return the flatness threshold.
- Postcondition
- positive_result: result>90 && result<180
void vtkSmoothErrorMetric::SetAngleTolerance |
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double |
value | ) |
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Set the flatness threshold with an angle in degrees. Internally compute the cosine. value is supposed to be in ]90,180[, if not it is clamped in [90.1,179.9]. For instance 178 will give better result than 150.
int vtkSmoothErrorMetric::RequiresEdgeSubdivision |
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double * |
leftPoint, |
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double * |
midPoint, |
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double * |
rightPoint, |
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double |
alpha |
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Does the edge need to be subdivided according to the cosine between the two chords passing through the mid-point and the endpoints? The edge is defined by its `leftPoint' and its `rightPoint'. `leftPoint', `midPoint' and `rightPoint' have to be initialized before calling RequiresEdgeSubdivision(). Their format is global coordinates, parametric coordinates and point centered attributes: xyx rst abc de... `alpha' is the normalized abscissa of the midpoint along the edge. (close to 0 means close to the left point, close to 1 means close to the right point)
- Precondition
- leftPoint_exists: leftPoint!=0
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midPoint_exists: midPoint!=0
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rightPoint_exists: rightPoint!=0
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clamped_alpha: alpha>0 && alpha<1
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valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint) =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
double vtkSmoothErrorMetric::GetError |
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double * |
leftPoint, |
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double * |
midPoint, |
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double * |
rightPoint, |
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double |
alpha |
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Return the error at the mid-point. It will return an error relative to the bounding box size if GetRelative() is true, a square absolute error otherwise. See RequiresEdgeSubdivision() for a description of the arguments.
- Precondition
- leftPoint_exists: leftPoint!=0
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midPoint_exists: midPoint!=0
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rightPoint_exists: rightPoint!=0
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clamped_alpha: alpha>0 && alpha<1
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valid_size: sizeof(leftPoint)=sizeof(midPoint)=sizeof(rightPoint) =GetAttributeCollection()->GetNumberOfPointCenteredComponents()+6
- Postcondition
- positive_result: result>=0
double vtkSmoothErrorMetric::AngleTolerance |
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double vtkSmoothErrorMetric::CosTolerance |
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protected |
The documentation for this class was generated from the following file: