The .d format is a seldom-used ASCII polygon file format which is simpler than the .poly format as it only has only two sections: POINTS and POLYS. The .d format has only moves and draws, where a move signifies the beginning of a new polygon.

The .d format is suitable for user-written programs that create polygon information if you do not want to use the Houdini polygon library. It can describe 2D or 3D lines and supports comments.


  • The standard syntax for a .d file is a set of commands.

  • .d files have one command per line.

  • The character in the first column (m or d) specifies the command (move or draw). Commands are followed by white space, then a list of arguments delimited by whitespace.

  • Whitespace is any combination of tabs and space characters.

  • The arguments are floating point numbers.

First character Command Arguments




move to…

x y [z]


draw to…

x y [z]

Supported file formats