Sorry, got it - 5 min´s after posting:
works...
u#=(tri\pu[vert] * (size /lmsize) )+(x/lmsize) v#=(tri\pv[vert] * (size / lmsize) )+(y/lmsize)
works...
u#=(tri\pu[vert] * (size /lmsize) )+(x/lmsize) v#=(tri\pv[vert] * (size / lmsize) )+(y/lmsize)