Ok.. now I understand what you mean..
You wanna manipulate the matrix's tiles to make
levels, with buildings, etc..
Actually it is impossible, because the matrix is
a DBP object and is much different than terrain (an object)..
So matrix's vertices have no 100% editable data..
And I don't think it is possible to put a tile above
other tile.. So it is actually impossible to make
a 90° wall of something like that..
Anyway, matrixes are not good for levels (a matrix
with 50x50 tiles slows downs the program much more
than an object with the same triangles count)..
I think that matrixes were the most anti-professional
idea from TGC..
But it is still useful for beginners
who wanna make small landscapes.. or to make a simple
cartoon water effect or a not so large shifting matrix
(it is still slower than an animated object)..
So don't get crazy due that.. matrixes are too weighed..
Of course I'm not the best person for helping you with
matrixes because, as you see, I don't use them..
They are really weighed..
The worst foe lies within the self..