Hello,
Collada support or other mesh format has been already discussed.
As blender can read collada and write .tri it's not a priority.
BUT collada seem to become quite a standard.
I think that a read collada function can exist in a test program for example. It can be incorporated in raydium directly if it fit raydium spirit
(Xfennec is the ultimate keeper of raydium spirit).
But it's not a good news for my full rewrite of blender .tri export :
If you need it, it always can exist in your application, so you can begin to write it without any problem.
Have a nice day.
Ouille.