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Hull and Outfitting

ISFF Extensions

  • Last UpdatedJan 06, 2026
  • 1 minute read

Some programs create DGN files that are not standard. ImPLANT-I.exe can be configured to accept some of these extensions.

ImPLANT-I.exe normally requires that surfaces made by using rules, such as capped surfaces, shall have their caps classified as PRIMARY and their rules as PRIMARY RULES.

To allow ImPLANT-I.exe to accept such surfaces, in which there is always exactly one element in each cap and both the caps and the rules are classified as PRIMARY, type the command:

EXTENSION RULES PRIMARY ON

To allow ImPLANT-I.exe to accept surfaces where the rules are classified as CONSTRUCTION RULES, type the command:

EXTENSION RULES CONSTRUCTION ON

Some previous versions had the first extension always enabled for certain surfaces, but not the second. The default behaviour is now for neither extension to be enabled.

To restore this default behaviour, type the command:

EXTENSION OFF

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