.d (draw) format

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.

Syntax

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
`#`	Comment
`m`	move to…	`x` `y` [`z`]
`d`	draw to…	`x` `y` [`z`]