Transforming 3D data to 2D data for clustring

Hi,

I have a 3d data (x,y,z), I want to use clustring on it but all the clustring fuction support 2d data (x,y) only.

how can I transform the 3d data to 2d data to use clustring while haveing the data be semanticlly correct, since the reading at every point is important.

this is a small example of the data:

CubeRaw(1:3,1:3,1:3)
ans = 
ans(:,:,1) =

    1.0156   -7.0000   -8.9062
  -12.6953  -10.0000   -7.1250
  -10.6641   -7.0000   -4.1562


ans(:,:,2) =

    2.0312  -11.0938   -8.6406
  -10.1562   -6.1016   -9.8750
  -10.6641    2.7734   -4.9375


ans(:,:,3) =

         0  -12.1406   -9.6250
   -5.7031   -1.7344  -12.0312
   -6.8438    5.7812   -4.2109