Vertices

#1 Yes, look at the DTS format. I'm not sure what you mean by "surfaces" but we can use vertices to create the triangles or polygons in a modeling app then export to the dts mesh.

#2 Thanks
For surfaces I mean tris and quads
OK for modelling app but what I mean is :
Is it possible to deform a mesh on the fly ( in the game play) ?

#3 Well I made a poly (by mistake and too little sleep) with app. 30 edges. this one was nicely exported to .dts and entered fine into the showtool and TGE 1.5x and TGEA fine.....

And it is possible to make mesh deformation on the fly according to what ive read so far.
Some of the spells in AFX shows something that looks like mesh deformations, but I think those are bone/node calcs.
But for more info read about mesh transformations etc. in the modeling docs found elswhere.