Textures' quality

My name is Igor Cabrera and I want to learn how to use Java3D.

In order to learn Java3d I decided to make a game that should allow the user to navigate inside a house model. I started to work in my ‘doom-like’ game and I based it on G3DMazeRoom by Martin Adams because it has much of the functionalities that I needed. (see http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=4385&lngWId=2)

My problem is that I made some objects in 3DS MAX, and I exported them to *.OBJ, when I retrieve them from the OBJLoad demo that comes with Java 3D their textures look very realistic (some problems with UVW Mapping, but that’s all), but when I load the same object inside the G3DMazeRoom the textures do not have the same quality, the UVW Mapping is OK but they look like if they were displayed in 16 colors or something like that .What am I doing wrong?

Help me please!!