youll need a modeling software to do so, and that exports in DirectX or .X format, or if it doesnt export in .X you can find a file converter or use another modleing program to import your model and export it to .X
programs i know of are:
Milkshape 3D(or somthing like that)-costs money tho with free trial for 30 days i beleive
AutoDesk 3DS Max- cost extreme amounts of money ($1000+) with free 30 day trial or if you sign up for the student version its free
Fragmotion- simple to use, free full licence for 7 days when you type in a quote(you can repeat it as long as you like, if not it would be $50)
thats all i can think of off the top of my head
computer specs: ASUS,Win7 x64, AMD Phenom II X6 1035T Processor, ATI Radeon HD 5700 Series, 2600 Mhz, 6 Cores, 6 Logical Processors, 8 Gig RAM, 1 Terabyte Memory, I am a happy child
