# FilterCells
filter out some cells

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<title>grid_in</title></rect>
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<text x="1.9em" y="0.9em" class="text" >unstructured grid with or without data<tspan> (grid_in)</tspan></text>
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<text x="1.9em" y="5.8999999999999995em" class="text" >filtered grid with or without data<tspan> (grid_out)</tspan></text>
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## Parameters
|name|description|type|
|-|-|-|
|filter_expression|elements for which this expression is true are filtered out, for supported symbols see selection lists|String|
|filterType|filter type (Ghost, Elements, Vertices)|Int|
|SupportedVariables|Supported Variables (cellDiameter, datavalue, dimensionality, edgeLength, elem, numFaces, numVertices, surface, type, volume, x_center, x_max, x_min, y_center, y_max, y_min, z_center, z_max, z_min)|Int|
|SupportedConstants|Supported Constants (BAR, HEXA, HEXAHEDRON, LINE, PLG, PLH, POINT, POLYGON, POLYHEDRON, POLYLINE, PRISM, PT, PYR, PYRAMID, QUAD, TETRA, TETRAHEDRON, TRI, TRIANGLE)|Int|