Section: Visualization Toolkit Graphics Classes
The algorithm works by determining normals for each polygon and then averaging them at shared points. When sharp edges are present, the edges are split and new points generated to prevent blurry edges (due to Gouraud shading).
To create an instance of class vtkPolyDataNormals, simply invoke its constructor as follows
obj = vtkPolyDataNormals
obj
is an instance of the vtkPolyDataNormals class.
string = obj.GetClassName ()
int = obj.IsA (string name)
vtkPolyDataNormals = obj.NewInstance ()
vtkPolyDataNormals = obj.SafeDownCast (vtkObject o)
obj.SetFeatureAngle (double )
- Specify the angle that defines a sharp edge. If the difference in
angle across neighboring polygons is greater than this value, the
shared edge is considered "sharp".
double = obj.GetFeatureAngleMinValue ()
- Specify the angle that defines a sharp edge. If the difference in
angle across neighboring polygons is greater than this value, the
shared edge is considered "sharp".
double = obj.GetFeatureAngleMaxValue ()
- Specify the angle that defines a sharp edge. If the difference in
angle across neighboring polygons is greater than this value, the
shared edge is considered "sharp".
double = obj.GetFeatureAngle ()
- Specify the angle that defines a sharp edge. If the difference in
angle across neighboring polygons is greater than this value, the
shared edge is considered "sharp".
obj.SetSplitting (int )
- Turn on/off the splitting of sharp edges.
int = obj.GetSplitting ()
- Turn on/off the splitting of sharp edges.
obj.SplittingOn ()
- Turn on/off the splitting of sharp edges.
obj.SplittingOff ()
- Turn on/off the splitting of sharp edges.
obj.SetConsistency (int )
- Turn on/off the enforcement of consistent polygon ordering.
int = obj.GetConsistency ()
- Turn on/off the enforcement of consistent polygon ordering.
obj.ConsistencyOn ()
- Turn on/off the enforcement of consistent polygon ordering.
obj.ConsistencyOff ()
- Turn on/off the enforcement of consistent polygon ordering.
obj.SetAutoOrientNormals (int )
- Turn on/off the automatic determination of correct normal
orientation. NOTE: This assumes a completely closed surface
(i.e. no boundary edges) and no non-manifold edges. If these
constraints do not hold, all bets are off. This option adds some
computational complexity, and is useful if you don't want to have
to inspect the rendered image to determine whether to turn on the
FlipNormals flag. However, this flag can work with the FlipNormals
flag, and if both are set, all the normals in the output will
point "inward".
int = obj.GetAutoOrientNormals ()
- Turn on/off the automatic determination of correct normal
orientation. NOTE: This assumes a completely closed surface
(i.e. no boundary edges) and no non-manifold edges. If these
constraints do not hold, all bets are off. This option adds some
computational complexity, and is useful if you don't want to have
to inspect the rendered image to determine whether to turn on the
FlipNormals flag. However, this flag can work with the FlipNormals
flag, and if both are set, all the normals in the output will
point "inward".
obj.AutoOrientNormalsOn ()
- Turn on/off the automatic determination of correct normal
orientation. NOTE: This assumes a completely closed surface
(i.e. no boundary edges) and no non-manifold edges. If these
constraints do not hold, all bets are off. This option adds some
computational complexity, and is useful if you don't want to have
to inspect the rendered image to determine whether to turn on the
FlipNormals flag. However, this flag can work with the FlipNormals
flag, and if both are set, all the normals in the output will
point "inward".
obj.AutoOrientNormalsOff ()
- Turn on/off the automatic determination of correct normal
orientation. NOTE: This assumes a completely closed surface
(i.e. no boundary edges) and no non-manifold edges. If these
constraints do not hold, all bets are off. This option adds some
computational complexity, and is useful if you don't want to have
to inspect the rendered image to determine whether to turn on the
FlipNormals flag. However, this flag can work with the FlipNormals
flag, and if both are set, all the normals in the output will
point "inward".
obj.SetComputePointNormals (int )
- Turn on/off the computation of point normals.
int = obj.GetComputePointNormals ()
- Turn on/off the computation of point normals.
obj.ComputePointNormalsOn ()
- Turn on/off the computation of point normals.
obj.ComputePointNormalsOff ()
- Turn on/off the computation of point normals.
obj.SetComputeCellNormals (int )
- Turn on/off the computation of cell normals.
int = obj.GetComputeCellNormals ()
- Turn on/off the computation of cell normals.
obj.ComputeCellNormalsOn ()
- Turn on/off the computation of cell normals.
obj.ComputeCellNormalsOff ()
- Turn on/off the computation of cell normals.
obj.SetFlipNormals (int )
- Turn on/off the global flipping of normal orientation. Flipping
reverves the meaning of front and back for Frontface and Backface
culling in vtkProperty. Flipping modifies both the normal
direction and the order of a cell's points.
int = obj.GetFlipNormals ()
- Turn on/off the global flipping of normal orientation. Flipping
reverves the meaning of front and back for Frontface and Backface
culling in vtkProperty. Flipping modifies both the normal
direction and the order of a cell's points.
obj.FlipNormalsOn ()
- Turn on/off the global flipping of normal orientation. Flipping
reverves the meaning of front and back for Frontface and Backface
culling in vtkProperty. Flipping modifies both the normal
direction and the order of a cell's points.
obj.FlipNormalsOff ()
- Turn on/off the global flipping of normal orientation. Flipping
reverves the meaning of front and back for Frontface and Backface
culling in vtkProperty. Flipping modifies both the normal
direction and the order of a cell's points.
obj.SetNonManifoldTraversal (int )
- Turn on/off traversal across non-manifold edges. This will prevent
problems where the consistency of polygonal ordering is corrupted due
to topological loops.
int = obj.GetNonManifoldTraversal ()
- Turn on/off traversal across non-manifold edges. This will prevent
problems where the consistency of polygonal ordering is corrupted due
to topological loops.
obj.NonManifoldTraversalOn ()
- Turn on/off traversal across non-manifold edges. This will prevent
problems where the consistency of polygonal ordering is corrupted due
to topological loops.
obj.NonManifoldTraversalOff ()
- Turn on/off traversal across non-manifold edges. This will prevent
problems where the consistency of polygonal ordering is corrupted due
to topological loops.