The ploting of surface color

I used trisurf(t,X,Y,Z,C) where C is rgb matrix. If dimension X,Y and Z=[n,1], n=1 ,2,.........,M and t=[n2,3],n2=1,2,3,........,M1 IF the dimension of C is [nn,1] where nn=M1 , how can i plot the C co lour ? If i not wrong , in this function , nn should be equal to M but not M1! Thank