some ideas..and finding

1.
http://forum.java.sun.com/thread.jspa?threadID=650363&messageID=3826884
has solution to import texture to a obj format file
uv mapper is the key software to generate the texture in BMP format, although i dont know what is UV mapping...
2.
the svg parser can parse the svg file and then get the coordinate from it.
the test program can generate the wall with no thickness...(fake wall)
3.
x3d may be need to be investigated...