Hi SKY ANGEL
Fps creator does not just use .DDS image files, but also use Png and Tga, But .DDS is more prefered throughout game developing.
Autodesk is 3ds file format and you can convert if you get a copy of 3d Max and go here to get the plugin.
http://usa.autodesk.com/adsk/servlet/pc/item?id=10775855&siteID=123112
I would personaly avoid using Sketchup, as it is time consuming to convert using other programs, as you would need to the right ones that allow for import of sketchup suported exports, expesialy in the free version of sketchup.
The pro version has more expots that will make you life more easily on converting,
ok asuming your using free version, you would also need another modeling program that can inport DAE format.
The only one that is free that suports and imports good is blender.
or a high price program like 3D MAX
Milkshape does not import DAE well my latest version does not But it does export fpsc file type of DirectX (.X file )
So in short you will get an headache, and also when importing and exporting from one program to another there are many other settings to ajust to make your model look correct,
I would personaly would use a modeling program that has the ability of Eporting in DirectX .X format and then you can just add it into Segment creator or Entity workshop or whatever and you should be ok
Note : Blender is one of the best modeling programs out there that is free, but is a bit complicated for the Novice but would start using it than any other as it is well suported in tutorials.
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