When applied to a Revit material they can be either 'Surface Patterns' or 'Cut Patterns'.
The Filled Region will contain a Fill Pattern imported from AutoCAD! Extract it from the compressed package and paste it on the desktop. A transparent hatch is most readily experienced when using the Solid hatch pattern, although any pattern can be used. Select the object for which you want to hide an individual surface hatch, then click tab Surface Hatch panel Add Override. PAT hatching pattern to a topography subregion.
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