I want to know how to use other 3D files ( .wrl, .obj, .dfx, .iv…) in opengl programing.
please answer this question…
Answering your question would require allot of detail. The only way you will be able to incorporate different file formats in your opengl programs is to reasearch it yourself.
you need to find out about the given files structure, write an procedure to read in the file and extract all the information you need, then render it using OpenGL.
go to http://www.wotsit.org for information on many different file formats.
Good Luck 
-Dave
[This message has been edited by Warrior (edited 04-16-2001).]