exporting autocad to half-life hammer editor

[c0rrupt]

Is this possible? I have a building made in AutoCad that I would like to turn into a Half-Life (1, not 2) map. In Hammer, there is no option to import an AutoCad dwg file. Is there a tool that will convert it to the appropriate format? Searching Google turns up nothing.

 

[JRPereira]

You might have to convert between a few formats. Doesn't hammer support importing .max or .3ds files? I'm pretty sure 3dsm can import autocad stuff.