Java 3D with .obj files

Hi,
I'm pretty new to Java3D and so on a bit of an unphill struggle right now. I am trying to load a 3d obj file (that i created myself) into my program. It is a simple boat with a sail and a hull, I am trying to animate these parts of the object separately.
I have added the two different components to seperate TransformGroups (one called "boat" one called "sail") and the sail is a child of boat. I can move the boat around with my mouse, but when i try and rotate the sail (using .rotY(20D)) the sail rotates from the centre of its location in the object (i.e it moves away from the mast)
so my question is, how do i rotate this part of the object from one side only? is there a way to find out the length of it? then i could use the rotate "around the corner" method possibly.
Any help or theories on how to do this would be greatly appreciated - as i said, i'm trying to learn the basics so i can get on to some trickier things, and seem to be hitting hurdle after hurdle!.
thanks

hi,
j3d supports these file formats:
3DS 3D-Studio
COB Caligari trueSpace
DEM Digital Elevation Map
DXF AutoCAD Drawing Interchange File
IOB Imagine
LWS Lightwave Scene Format
NFF WorldToolKit NFF format
OBJ Wavefront
PDB Protein Data Bank
PLAY PLAY
SLD Solid Works (prt and asm files)
VRT Superscape VRT
VTK Visual Toolkit
WRL Virtual Reality Modeling Language
for more info look at j3d tutorial, chapter 3, section 3.2. the .obj loader in j3d is not a full implementation of the file format, but you can extend it (it's possible to add colors in j3d program directly or extend the loader) and add what you need or you can write your own loader. i recommend to search the web for better implementation of obj. file loader written in java.

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