Revit to AutoCAD Hatch Pattern Pitfall

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Can one create a surface pattern for Revit representing a Herringbone pattern measuring 230mm x 1500mm? This was a question posed to me this week. There are many instances where custom patterns may be applicable. However, it may be wise to choose patterns that are compliant with one’s software, or that one makes the decision to have a pattern represents the idea of the pattern one needs, and use a legend.

  • The pattern is shown below.

Micrographics, Autodesk, Revit, AutoCAD, Hatch, Pattern, .PAT

  • Notice how this pattern repeats every 69 meters!

Micrographics, Autodesk, Revit, AutoCAD, Hatch, Pattern, .PAT

  • For those that know how PAT files are created, this already spells potential trouble. Luckily this pattern is predictable and one would be able to create the pat file using Excel formulae. I estimate the pattern will be 1104 lines of code long!
  • The difficulty is that Revit can not manage such a large pattern! As in the screenshot below, it seems the Revit limit is set to 30 480mm.

Micrographics, Autodesk, Revit, AutoCAD, Hatch, Pattern, .PAT

Micrographics, Autodesk, Revit, AutoCAD, Hatch, Pattern, .PAT

  • This pattern is then available for use on a surface pattern.

Micrographics, Autodesk, Revit, AutoCAD, Hatch, Pattern, .PAT

  • If the pattern cannot be interpreted by Revit (too large in this case) then it will fill as a solid pattern regardless of whether the CAD is imported (green) or linked in (red).

Micrographics, Autodesk, Revit, AutoCAD, Hatch, Pattern, .PAT

If you need advice on using patterns for hatching so we may be of service to you.

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