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VTK-m
2.2
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Retrieves field values from a neighborhood. More...
#include <FieldNeighborhood.h>
Public Types | |
| using | ValueType = typename FieldPortalType::ValueType |
Public Member Functions | |
| FieldNeighborhood (const FieldPortalType &portal, const vtkm::exec::BoundaryState &boundary) | |
| ValueType | Get (vtkm::IdComponent i, vtkm::IdComponent j, vtkm::IdComponent k) const |
| Retrieve a field value relative to the visited element. More... | |
| ValueType | GetUnchecked (vtkm::IdComponent i, vtkm::IdComponent j, vtkm::IdComponent k) const |
| Retrieve a field value relative to the visited element without bounds checking. More... | |
| ValueType | Get (const vtkm::Id3 &ijk) const |
| Retrieve a field value relative to the visited element. More... | |
| ValueType | GetUnchecked (const vtkm::Id3 &ijk) const |
| Retrieve a field value relative to the visited element without bounds checking. More... | |
Public Attributes | |
| vtkm::exec::BoundaryState const *const | Boundary |
The vtkm::exec::BoundaryState used to find field values from local indices. More... | |
| FieldPortalType | Portal |
| The array portal containing field values. More... | |
Retrieves field values from a neighborhood.
FieldNeighborhood manages the retrieval of field values within the neighborhood of a vtkm::worklet::WorkletPointNeighborhood worklet. The Get methods take ijk indices relative to the neighborhood (with 0, 0, 0 being the element visted) and return the field value at that part of the neighborhood. If the requested neighborhood is outside the boundary, the value at the nearest boundary will be returned. A vtkm::exec::BoundaryState object can be used to determine if the neighborhood extends beyond the boundary of the mesh.
This class is typically constructed using the FieldInNeighborhood tag in an ExecutionSignature. There is little reason to construct this in user code.
| using vtkm::exec::FieldNeighborhood< FieldPortalType >::ValueType = typename FieldPortalType::ValueType |
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Retrieve a field value relative to the visited element.
The index is given as three dimensional i, j, k indices. These indices are relative to the currently visited element. So, calling Get(0, 0, 0) retrieves the field value at the visited element. Calling Get(-1, 0, 0) retrieves the value to the "left" and Get(1, 0, 0) retrieves the value to the "right."
If the relative index points outside the bounds of the mesh, Get will return the value closest to the boundary (i.e. clamping behvior). For example, if the visited element is at the leftmost index of the mesh, Get(-1, 0, 0) will refer to a value outside the bounds of the mesh. In this case, Get will return the value at the visited index, which is the closest element at that boundary.
When referring to values in a mesh of less than 3 dimensions (such as a 2D structured), simply use 0 for the unused dimensions.
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inline |
Retrieve a field value relative to the visited element.
The index is given as three dimensional i, j, k indices. These indices are relative to the currently visited element. So, calling Get(0, 0, 0) retrieves the field value at the visited element. Calling Get(-1, 0, 0) retrieves the value to the "left" and Get(1, 0, 0) retrieves the value to the "right."
If the relative index points outside the bounds of the mesh, Get will return the value closest to the boundary (i.e. clamping behvior). For example, if the visited element is at the leftmost index of the mesh, Get(-1, 0, 0) will refer to a value outside the bounds of the mesh. In this case, Get will return the value at the visited index, which is the closest element at that boundary.
When referring to values in a mesh of less than 3 dimensions (such as a 2D structured), simply use 0 for the unused dimensions.
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inline |
Retrieve a field value relative to the visited element without bounds checking.
GetUnchecked behaves the same as Get except that no bounds checking is done before retrieving the field value. If the relative index is out of bounds of the mesh, the results are undefined.
GetUnchecked is useful in circumstances where the bounds have already be checked. This prevents wasting time repeating checks.
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inline |
Retrieve a field value relative to the visited element without bounds checking.
GetUnchecked behaves the same as Get except that no bounds checking is done before retrieving the field value. If the relative index is out of bounds of the mesh, the results are undefined.
GetUnchecked is useful in circumstances where the bounds have already be checked. This prevents wasting time repeating checks.
| vtkm::exec::BoundaryState const* const vtkm::exec::FieldNeighborhood< FieldPortalType >::Boundary |
The vtkm::exec::BoundaryState used to find field values from local indices.
| FieldPortalType vtkm::exec::FieldNeighborhood< FieldPortalType >::Portal |
The array portal containing field values.
1.8.17