UGrids Tools
This article describes tools from the SMS toolbox that are used to edit, create, and otherwise modify UGrids.
UGrids Tools
2D Data from 3D Data
The 2D Data from 3D Data tool is used to convert 3D cell data to a 2D UGrid with datasets. The user selects a 3D cell dataset as input to the tool (the dataset may have multiple time steps). Then the user may choose to output multiple datasets from the tool; the following datasets may be computed by the tool: highest active value, average, maximum, minimum, value for each layer. The 3D UGrid cells are organized into columns of cells to compute the various output datasets. Examples follow that explain how the tool works for different types of UGrids.
This tool will only work on UGrids that are made up of 3D cells and those cells must all be prisms (the side faces of the cells must be vertical). Further, the grid must have layers assigned to the cells. The tool will return an error if any of these conditions are not met.
Input parameters
- Cell data set – The input 3D dataset that will be converted to 2D datasets
- Name of the output grid – Name for the newly created 2D UGrid. If this value is left blank then the name of the output grid will be set to be the name of the input cell dataset.
- Compute highest active value in column – Option to output a 2D dataset where the value will come from the highest active cell in the 3D column of cells.
- Compute average value in column – Option to output a 2D dataset of the average value in the 3D column of cells.
- Compute maximum value in column – Option to output a 2D dataset of the maximum value in the 3D column of cells.
- Compute minimum value in column – Option to output a 2D dataset of the minimum value in the 3D column of cells.
- Compute value for each layer in column – Option to output 2D datasets of the value for each layer in the 3D column of cells.
Output parameters
- The output is a 2D UGrid and datasets.
Current location in Toolbox
Unstructured Grids/2D Data from 3D Data
Examples
Files for example 1 and example 3 can be downloaded here.
Example 1
The first example is a simple structured 3D Grid. The grid is made up of 4 rows, 4 columns, and 3 layers.
The dataset “elev” has constant values for each layer of the grid: layer 1 – 41.6, layer 2 – 25.0, and layer 3 – 8.3. Running the tool on this dataset produces the following 2D UGrid and datasets.
In this example the datasets are straight forward.
The "elev_highest_active" creates a dataset with values from the top of the 3D UGrid. All of the values are 41.6. The "elev_average" dataset gives the average value in each cell column and in this case that will match the values from layer 2 of the 3D UGrid (25.0). The elev_max dataset matches the values of the top layer of the 3D UGrid (41.6). The "elev_min" dataset matches the values from the bottom layer of the 3D UGrid (8.3). The "elev_layer_1", "elev_layer_2", and "elev_layer_3" match the values from the respective layer of the 3D UGrid.
Example 2
The second example is the same 3D Grid from example 1 except in this case the 3D dataset has activity. That is to say, some of the values in the dataset are considered inactive. The cells with inactive values are shown in red in the following figure.
Typically, these values are not contoured on the 3D UGrid.
When the tool runs with this example the following datasets are created. First, examine the layer datasets and notice the effect that activity has on the created datasets.
The "active_layer_1" dataset shows the 2 cells with inactive values.
The "active_layer_2" dataset show the 1 cell with an inactive value.
The "active_layer_3" dataset shows the 1 cell with an inactive value.
The "active_highest_active" has values from 2 of the lower layers in the 3D UGrid.
The "active_average" has 3 values that are affected by the dataset activity. The "active_maximum" and "active_minimum" datasets are similar to the "active_average".
Example 3
The third example is a 3D UGrid with variable number of cells per layer and variable refinement in each layer. A figure of the entire grid is shown, followed by figures of individual layers.
Layer 2 of the 3D UGrid:
Layer 3 of the 3D UGrid:
Layer 4 of the 3D UGrid:
Layer 5 of the 3D UGrid:
When the tool is run with this example the following datasets are created.
The next figure shows the resulting 2D UGrid with the "elev_highest_active" dataset contoured.
Notice that the 2D cells are defined by the smallest 3D cells in any column. The 2 cells that are not pink have values that came from layer 2 of the 3D Grid. The "elev_average", "elev_maximum", "elev_minimum" are computed in a straight forward manner and are not shown here.
The "elev_layer" datasets are shown next. Notice that some layer datasets have inactive values because there were no cells defined in those cell columns.
The "elev_layer_1" dataset:
The "elev_layer_2" dataset:
The "elev_layer_3" dataset:
The "elev_layer_4" dataset:
The "elev_layer_5" dataset:
Example 4
The fourth example uses the same 3D UGrid as example 3 and the dataset now includes activity. The orange cells in the grid have a value of 5. The red cells have inactive dataset values.
Layer 2 values for 3D UGrid:
When the tool is executed the following results are generated from the tool.
The "active_highest_active" dataset result:
The "active_layer_1" dataset:
The "active_layer_2" dataset:
The "active_layer_3" dataset:
The "active_layer_4" dataset:
The "active_layer_5" dataset:
Example 5
The fifth example is a voronoi 3D UGrid. This grid has a variable number of cells in each layer. This example comes from the MODFLOW-USG Complex Stratigraphy tutorial.
Layer 2 of 3D UGrid:
Layer 3 of 3D UGrid:
Layer 4 of 3D UGrid:
Layer 5 of 3D UGrid:
When the tool is run the following figure shows the output 2D UGrid:
2D UGrid from 3D UGrid
The 2D UGrid from 3D UGrid tool is used to create a 2D UGrid from the top or bottom of a 3D UGrid, preserving the order of the points and cells. The point and cell numbers in the 2D UGrid may not exactly match the top (or bottom) of the 3D UGrid because the 2D numbering must start at 1 and have no gaps, but the order will be the same (see examples below). The user selects a 3D UGrid as input to the tool, selects whether to use the top or the bottom, and, optionally, provides a name for the 2D UGrid that will be created. This tool will only work on UGrids that are made up of 3D cells.
The tool uses layer information to determine the top and bottom of the UGrid. If there is no layer information, the tool will create the 2D UGrid from upward (if 'Top' is selected) or downward (if 'Bottom' is selected) oriented faces that have no adjacent cell above (or below). This could result in a incorrect 2D UGrid if there are cells in the middle of the 3D UGrid which do not have an adjacent cell above (or below).
Input parameters
- 3D UGrid – The input 3D UGrid that will be used.
- Top or bottom – Option to use the top or bottom of the 3D UGrid.
- 2D UGrid name – Name of the 2D UGrid that will be created.
Output parameters
- The output is a 2D UGrid.
Current location in Toolbox
Unstructured Grids/2D UGrid from 3D UGrid
Examples
Files for example 1 can be downloaded here.
Example 1
The following figure shows a 3D UGrid with three layers in oblique view.
The next two figures show the numbering of the points and cells on the top of the 3D UGrid, and on the 2D UGrid that would get generated by the tool if the "Top" option is selected. Notice the 2D UGrid numbering happens to match exactly with that of the 3D UGrid because the top points and cells start at one and there are no gaps in the numbering.
Example 1: 3D UGrid top numbering
Example 1: 2D UGrid from selecting "Top"
The next two figures show the numbering of the points and cells on the bottom of the 3D UGrid, and on the 2D UGrid that would get generated by the tool if the "Bottom" option is selected. Notice the 2D UGrid numbering differs from the bottom of the 3D UGrid but the order for both points and cells is the same.
Example 1: 3D UGrid bottom numbering
Example 1: 2D UGrid from selecting "Bottom"
Export Curvilinear Grid
The Export Curvilinear Grid tool is used to create a curvilinear (boundary fitted) grid file (or files) for a curvilinear compatible mesh, scatter set or UGrid that is loaded into SMS. This can make use of user provided I,J index data sets if they exist. It also supports the option to compute I,J data indices. In this case, the orientation of the first cell in the surface will define the orientation of the I,J axes of the grid.
For EFDC grid files it may also use provided cell based datasets to populate the additional properties of the grid. These can include:
- Depth
- Z Roughness
- Vegetation type
- Wind shelter
Input Parameters
The format of the data file will be in either CH3D (also referred to as GSMB) or EFDC (also referred to as LTFATE). The input parameters include:
- Generate cell i-j datasets toggle.
- Cell i-coordinate dataset (optional) – Select the cell based dataset that defines the I index of each cell. This is required if the toggle to generate I-J is not selected.
- Cell j-coordinate dataset (optional) – Select the cell based dataset that defines the J index of each cell. This is required if the toggle to generate I-J is not selected.
Datasets that are available if the format is EFDC:
- Depth dataset (optional) – Select the cell based dataset to define the depth of each cell.
- Z Roughness dataset (optional) – Select the cell based to define the roughness of each cell.
- Vegetation type dataset (optional) – Select the cell based to define the vegetation type of each cell.
- Wind shelter dataset (optional) – Select the cell based to define the wind shelter value of each cell.
Output Parameters
The path to where files will be saved defaults to the project directory if one is defined in the instance of SMS. The path can be cut/paste from a file browser in windows to this edit field.
- CH3D grid file name defaults to "grid.inp".
- EFDC dxdy file name defaults to "dxdy.inp".
- EFDC lxly file name defaults to "lxly.inp".
- EFDC cell file name defaults to "cell.inp".
Current location in toolbox
This tool is currently located in Unstructured Grids/Export Curvilinear Grid.
Notes
The file formats for the CH3D and EFDC grids are defined in the Import Curvilinear Tool documentation. The cell.inp file for EFDC is not used for importing since it does not include any unique information for the definition of the grid. This file includes an ASCII map of the cell types in the grid.
Extrude UGrid
The Extrude UGrid tool converts a 2D UGrid into a 3D UGrid.
Input Parameters
- Input grid – Select a 2D UGrid to convert to a 3D UGrid.
- Number of layers – Enter the number of layers the new 3D UGrid will have.
- Layer n thickness – For each layer, enter the layer thickness. This value will be in the units set in the project projection.
Output Parameters
- Output grid – Name of the output grid.
Current Location in Toolbox
Unstructured Grids/Extrude UGrid
Fill Holes in UGrid
The Fill Holes in UGrid fills all voids in a given mesh with new mesh elements. The output is a mesh that can be converted back into a UGrid if needed. This tool also works on meshes.
Input Parameters
- 2D UGrid – Select a 2D UGrid that needs holes filled.
Output Parameters
- New Mesh Name – Enter the name that the output mesh should have.
Current Location in Toolbox
Unstructured Grids/Fill Holes in UGrid
Import Curvilinear Grid
The Import Curvilinear Grid tool is used to load an existing curvilinear (boundary fitted) grid into SMS as a UGrid object. This will also create cell based datasets defining the I, J index of each cell in the UGrid. Depending on the selected format and the specific data file(s).
For EFDC grid files it may also create additional cell based datasets for the UGrid that is loaded. These can include:
- Depth
- Z Roughness
- Vegetation type
- Wind shelter
Input parameters
- Format of the data file – Select the file format for the UGrid that will be imported.
- "CH3D" – Will import a CH3D file.
- "EFDC" – Will import a EFDC file.
- CH3D formatted grid file – Clicking the Select File button will open a Select File dialog where the CH3D file can be selected.
- EFDC formatted dxdy.inp file – Clicking the Select File button will open a Select File dialog where the dxyy.inp EFDC file can be selected.
- EFDC formatted lxly.inp file – Clicking the Select File button will open a Select File dialog where the lxly.inp EFDC file can be selected.
Output parameters
- Output UGrid name – Enter the name of the imported UGrid.
Current location in the toolbox
Unstructured Grids/Import Curvilinear Grid
CH3D Format
Format of the CH3D file (grid.inp). This file includes a 2 line header and a line for every corner point in a rectangular grid This includes inactive regions. The locations are ordered in a row major order. SMS will export 5 columns of data including (X, Y, Z, I, J). The (I, J) columns are not used in the import process. They are implied. The first line is a name to assign to the grid.
The second line defines the size of the grid based on cell corners. The number of cells in each direction is a maximum of the number of corners minus 1. Cell corners that do not correspond to an active cell in the grid is assigned a coordinate location of (9.0x1018, 9.0x1018, 9.0x1018).
Because this file format does not include cell based information, a single row or column of inactive cells is not supported. The corners of these cells are defined by the active neighbor, so the cell is assumed to exist. File organization:
Grid_name
num_rows_of_pts num_cols_of_pts
x y z 1 1
x y z 2 1
.
.
.
x y z num_rows 1
x y z 1 2
x y z 2 2
.
.
.
x y z num_rows 2
.
.
.
x y z 1 num
Format of the EFDC files (dxdy.inp, lxly.inp). This format includes two files that work together to define the grid. The "dxdy.inp" files includes a 4 line comment header and a line for every active cell in the grid The header is metadata only and is not used in the import process. The last header line defines the values in each column for the data following. This includes:
- I J: the column and row index of the cell on this line.
- DX DY: the width and height of this cell.
- WATER DEPTH: the depth of the water in this cell.
- BOTTOM ELEV: the ground elevation value for this cell (cell based).
- ZROUGH: the roughness for this cell.
- VEG TYPE: the vegetation type for this cell.
The "lxly.inp" files also includes a 4 line comment header and a line for every active cell in the grid The header is metadata only and is not used in the import process. The last header line defines the values in each column for the data following. This includes:
- I J: the column and row index of the cell on this line.
- X Y: the location of the cell center of this cell.
- CUE CVE CUN CVN: the orientation of this cell (rotation values)
- WIND SHELTER: a wind shelter data value for this cell.
This format defines a nonconformal grid. Neighboring cells don't explicitly define the same corner points. When SMS loads this grid, the corner locations are merged to create a conformal grid. For this reason, when a grid is loaded and then rewritten, the detail definition may not be identical.
Import UGrid Points
The Import UGrid Points tool is used to import locations and datasets. The CSV file must contain coordinates for the points and, optionally, the file may contain datasets associated with the points.
The first line of the CSV file must be a header line with the coordinate columns of x, y, and z (optional). These columns must be named x, y, z. An error will be encountered if these columns do not exist.
Other columns may exist in the file for datasets. The dataset name is specified in the first line of the file. If the column does not have a name then the column will be skipped.
Transient data may also be imported using this tool. Transient datasets comprise multiple columns in the file with the same column name and with time specified on the second line of the file in the associated dataset column. There may not be any value specified on the second line of the file for the x, y coordinates. The time values may be relative times: 0.0, 2.5, 10.0, etc. Additionally, the time values may be specified as date times. The date format should be in the form of YEAR-MONTH-DAY HH:MM:SS.SS.
Multiple example files are shown below.
Input parameters
- CSV file with point coordinates and datasets – Shows the file name for the CSV file containing the coordinates and datasets. Clicking the Select File button will open a Select File browser dialog to select the CSV file.
- No data value – When the “No data value” is encountered in the csv file in one of the datasets XMS marks the value as “NULL” or “no data”. These values are not contoured or used in interpolation in XMS.
- Time unit – The time unit for transient datasets where the time is specified as a floating point number (in contrast to a date time).
- Coordinate system project file (*.prj) – Shows the file name for the projection associated with the coordinates of the points in the file. Clicking the Select File button will open a Select File browser dialog to select the PRJ file.
Current location in Toolbox
Unstructured Grids/Import UGrid Points
Example files
Example 1
id,y,x,c 1,15459458,2685809,6.4 2,15459506,2685824,9.7 3,15459524,2685850,8
This is a simple csv file. Notice the “x” and “y” columns; these are required. Note that “z” is not required. Also, notice that the order of x and y does not matter.
The other 2 columns: “id”, “c”. The will be imported as datasets.
Example 2
y x z TDS TDS conc 0 1 -16 -75 8.5 59.04 9.24 1.9 32 -60 9.8 90.2 71 4.8 50 -34 0.7 67.2 98.4 9.5
This example shows a file with “x”, ”y”, and “z” columns. Notice that there are no values on the second line of the file for x, y, and z. This indicates that times are being specified for the datasets in the file.
The other 2 columns: “TDS” and “conc”. The will be imported as datasets. TDS will be a transient dataset with times of 0.0 and 1.0. The user will have to specify the units of the times in the tool. The conc dataset will be imported without multiple time steps.
Example 3
y x c2 c2 c2 2011-02-01 2012-02-01 2013-02-01 -16 -75 59.04 43.64 9.24 32 -60 90.2 44.16 71 50 -34 67.2 0 98.4
This is a csv file with a transient dataset with the time specified as dates.
Example 4
y X c2 c2 c2 2011-02-01 15:30:22.1 2012-02-01 2013-02-01 6:45:15 -16 -75 59.04 43.64 9.24 32 -60 90.2 44.16 71 50 -34 67.2 0 98.4
This is a csv file with a transient dataset with the time specified as dates and times.
Lloyd Optimizer
The Lloyd Optimizer tool optimizes the angles in a triangular grid to make them close to 60 degrees. It can run for a given time, number of iterations, or until a point no longer moves far. It can also require that all points move far enough.
From CGAL:
This optimization process alternates relocating vertices to the center of mass of their Voronoi cells, and updating the Delaunay connectivity of the triangulation. The center of mass is computed with respect to a sizing function that was designed to preserve the local density of points in the grid...
Input Parameters
- Input grid – A UGrid containing triangles to optimize.
- Number of iterations to perform – The maximum number of iterations to perform before stopping. Can be set to 0 for no limit.
- Maximum duration, in seconds – The maximum amount of time to optimize for, in seconds. Set to "0" for no limit.
- Minimum movement ratio – Fraction of the length of a vertex's shortest incident edge by which it must move during an iteration. If an iteration would move the vertex by less than this amount, then movement of the vertex will be skipped during this iteration. Other vertices may still move during the iteration, and the skipped vertex may be moved during a later iteration if the vertex gets a larger proposed move. This can be useful to prevent the optimizer from spending time moving vertices by tiny amounts. It should be a value between 0 and 1. A value of 0 will disable this condition.
- Freeze ratio – Similar to Move ratio, except that the optimization will stop rather than skip the move.
Additional Notes
The optimizer will not move points on boundary polygons or the boundaries of holes.
During development, points were observed moving across boundaries in some cases. This issue can no longer be reproduced, which prevents understanding the underlying cause and verifying that it is truly resolved. To be on the safe side, the tool will delete any points that migrate across boundaries during optimization.
While this tool operates on any 2D UGrid, it requires that the grid be fully triangulated. To accomodate this, the tool will generate a triangulated grid based on the input grid and optimize the triangulated grid instead. This may result in swapped interior edges and non-triangular cells being broken down into triangular ones. Boundaries and holes will still be preserved.
The optimizer requires that either the Timeout option, number of Iterations option, or both be set to a nonzero value to ensure it converges. If the chosen values prove too low, it is possible to resume the optimization where it left off to save time. To resume optimization, run the tool again and use the previous output grid as the new input grid.
Output Parameters
- Smoothed grid – Name of the output grid.
Current Location in Toolbox
Unstructured Grids/Lloyd Optimizer
Map Activity to UGrid
This tool builds a unstructured grid (UGrid) using an existing geometry and an activity coverage. The resulting UGrid will not include areas designated as inactive in the activity coverage. The tool has the following options:
Input Parameters
- Input grid– Select the geometry that will define the values for the new UGrid.
- Activity coverage – Select the coverage that will define the activity for the new UGrid.
Output Paramters
- Name of the output ugrid – Enter the name for the new activity UGrid.
Current Location in Toolbox
Unstructured Grids/Map Activity to UGrid
Merge 2D UGrids
The Merge 2D UGrids tool merges two 2D geometries. These can be 2D meshes, 2D Grids, UGrids, or scatter sets. The geometries can overlap or not. In areas of overlap, the tool honors the primary grid, deletes all elements from the secondary grid that overlap part of the primary grid plus a buffer around the primary grid. This prevents the transition zone from becoming so small that poorly shaped cells result. The tool builds transition triangle cells to fill the gap created in this process. The new geometry is created as a 2D Mesh in SMS; in GMS, the tool output is a 2D UGrid.
Limitations:
- This tool only works on 2 geometries at a time. If multiple geometries are to be merged, they must be merged incrementally.
- The Primary grid must have defined cells/elements. Any disjoint points on the primary grid will be removed.
This tool is designed to replace the functionality to merge meshes and scatter sets in SMS. This operation is faster, more generic, and because it is in the toolbox, will be accessible outside of the standard SMS framework.
Input parameters
- Primary grid – Select the grid that will act as the primary grid. If there are conflicts during the merge, this grid will receive priority to resolve the conflict.
- Secondary grid – Select the grid that will act as the secondary grid during the merge.
- Duplicate point tolerance – When points are compared as duplicates the distance between the points is calculated. If the distance is less than this tolerance then the points are considered duplicates. This is used for comparing points on the outer boundary of the primary grid with points in the secondary grid and trying to preserve cells in the secondary grid that are adjacent to cells in the primary grid. The default value is usually sufficient but if you find cells in the secondary grid are being deleted and you want to preserve those then try increasing the tolerance.
- Buffer distance option – Option for buffering the outer boundary of the primary grid during the merge operation.
- Default – The tool will use 0.01 times the minimum cell edge length as the buffer distance.
- Specified – The tool will use the user specified buffer distance.
- Buffer distance – specify the desired buffer distance. This is the width of the transition zone between the geomtries.
- Stitch non-overlapping grids with matching boundary points – Option for merging two grids that have matching boundary points and no overlapping features. This option should only be used if the user is positive that the grids satisfy this constraint. A grid with internal holes will result from using this option when the grids overlap. The tool will run significantly faster if this option is checked.
Output parameters
- Merged grid – Enter the name of the new merged UGrid.
Current Location in toolbox
Unstructured Grids/Merge 2D UGrids
Refine UGrid
The Refine UGrid tool creates a 2D UGrid that has been refined based on an existing 2D UGrid and one or more elevation rasters.
Input parameters
- Grid – Select the 2D UGrid that will be refined.
- Default constant value – Enter a value for the desired average cell size for the new UGrid. It is important to note that the tool will refine the entire grid. If the default value is too small then there may be a long computation time for the tool. Entering a value that is too large may cause an error.
- Error threshold – Enter a value to guide the acceptable threshold for error for the grid refinement.
- Maximum iterations – The tool will perform multiple iterations when refining the new UGrid. Enter the maximum number of iterations to perform. The tool will stop performing iterations once it has reached the maximum limit if it has not completed refinement before this value is reached.
- Raster 1 (highest priority) – The elevation raster that will be used for refinement. This raster will be given priority over any additional rasters being used.
- Raster n – Allows selecting an additional raster to use in refinement.
Output parameters
- Output UGrid name – Enter the name for the new refined UGrid.
Current Location in toolbox
Unstructured Grids/Refine UGrid
- It is recommended to use the Smooth Datasets tool instead of this tool.
Smooth UGrid
The Smooth UGrid tool is nearly identical to part of the Smooth Datasets tool. It can be applied to a 2D mesh, a scatter set, or a 2D Ugrid. The tool only supports the slope limited smoothing as described in Smooth Datasets with a user specified anchor type.
The difference between the tools is that this tool actually creates a new geometry with the elevation values smoothed rather than just creating a new dataset on the existing geometry.
Input parameters
- Input grid – Select the UGrid to use.
- Maximum slope – Set the maximum potential slope of the UGrid.
- Anchor type – Select which type of anchor for the smoothing process.
- "Minimum value" – Sets the minimum elevation to be the anchor for the smoothing process.
- "Maximum value" – Sets the maximum elevation to be the anchor for the smoothing process.
Output parameters
- Smoothed grid – Enter the name of the new smoothed UGrid.
Current Location in toolbox
Unstructured Grids/Smooth Ugrid
Related Tools
UGrid from Coverage
The UGrid from Coverage tool creates a 2D unstructured mesh, or UGrid, from the feature objects on a selected coverage.
Input Parameters
- Coverage – Select a map coverage in the project.
Output Parameters
- Name of the output mesh – Enter a name for the new UGrid.
Current Location in Toolbox
Unstructed Grids/UGrid from Coverage
UGrid from Surface
The UGrid from Surface tool creates a new UGrid with copies of all of the datasets on the input mesh, scatter set, or Cartesian grid.
Input parameters
- Input grid – Select the input mesh, scatter set, or Cartesian grid to convert to a UGrid.
Output parameters
- Output grid name – Enter the name of the new Ugrid. If left blank the tool will use the name of the input UGrid.
Current location in Toolbox
Unstructured Grids/UGrid from Surface
Voronoi UGrid from UGrid
The Voronoi UGrid from UGrid tool creates a Voronoi UGrid from an existing geometry (2D Mesh, Scatter Set, or UGrid). The tool uses the centroid of each triangle, element or cell of the input geometry as a node in the resulting Voronoi UGrid. The cells around the edge of the UGrid are created by adding a Voronoi node at the bisection of the boundary edge and connecting that node to the node at the triangle/element/cell centroid.
These meshes can be passed into HEC-RAS 2D for analysis.
Input parameters
- Input grid – Select the geometry that will be converted to a Voronoi UGrid.
Output parameters
- Output grid name – Enter the name for the new Voronoi UGrid. This will be a UGrid because scatter sets and meshes do not support polygonal cells.
Current Location in toolbox
Unstructured Grids/Voronoi UGrid from UGrid
Example
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