Section: Visualization Toolkit Volume Rendering Classes
vtkUnstructuredGridPreIntegration performs ray integration by looking into a precomputed table. The result should be equivalent to that computed by vtkUnstructuredGridLinearRayIntegrator and vtkUnstructuredGridPartialPreIntegration, but faster than either one. The pre-integration algorithm was first introduced by Roettger, Kraus, and Ertl in "Hardware-Accelerated Volume And Isosurface Rendering Based On Cell-Projection."
Due to table size limitations, a table can only be indexed by independent scalars. Thus, dependent scalars are not supported.
To create an instance of class vtkUnstructuredGridPreIntegration, simply invoke its constructor as follows
obj = vtkUnstructuredGridPreIntegration
obj
is an instance of the vtkUnstructuredGridPreIntegration class.
string = obj.GetClassName ()
int = obj.IsA (string name)
vtkUnstructuredGridPreIntegration = obj.NewInstance ()
vtkUnstructuredGridPreIntegration = obj.SafeDownCast (vtkObject o)
obj.Initialize (vtkVolume volume, vtkDataArray scalars)
obj.Integrate (vtkDoubleArray intersectionLengths, vtkDataArray nearIntersections, vtkDataArray farIntersections, float color[4])
vtkUnstructuredGridVolumeRayIntegrator = obj.GetIntegrator ()
- The class used to fill the pre integration table. By default, a
vtkUnstructuredGridPartialPreIntegration is built.
obj.SetIntegrator (vtkUnstructuredGridVolumeRayIntegrator )
- The class used to fill the pre integration table. By default, a
vtkUnstructuredGridPartialPreIntegration is built.
obj.SetIntegrationTableScalarResolution (int )
- Set/Get the size of the integration table built.
int = obj.GetIntegrationTableScalarResolution ()
- Set/Get the size of the integration table built.
obj.SetIntegrationTableLengthResolution (int )
- Set/Get the size of the integration table built.
int = obj.GetIntegrationTableLengthResolution ()
- Set/Get the size of the integration table built.
double = obj.GetIntegrationTableScalarShift (int component)
- Get how an integration table is indexed.
double = obj.GetIntegrationTableScalarScale (int component)
- Get how an integration table is indexed.
double = obj.GetIntegrationTableLengthScale ()
- Get how an integration table is indexed.
int = obj.GetIncrementalPreIntegration ()
- Get/set whether to use incremental pre-integration (by default it's
on). Incremental pre-integration is much faster but can introduce
error due to numerical imprecision. Under most circumstances, the
error is not noticable.
obj.SetIncrementalPreIntegration (int )
- Get/set whether to use incremental pre-integration (by default it's
on). Incremental pre-integration is much faster but can introduce
error due to numerical imprecision. Under most circumstances, the
error is not noticable.
obj.IncrementalPreIntegrationOn ()
- Get/set whether to use incremental pre-integration (by default it's
on). Incremental pre-integration is much faster but can introduce
error due to numerical imprecision. Under most circumstances, the
error is not noticable.
obj.IncrementalPreIntegrationOff ()
- Get/set whether to use incremental pre-integration (by default it's
on). Incremental pre-integration is much faster but can introduce
error due to numerical imprecision. Under most circumstances, the
error is not noticable.