load data.mat
clf ()
colormap (jet (64))                                                             
h = tetramesh (tetra, X);                                                       
for ii=1:2:length(h)                                                           
  set(h(ii), "Visible", "off");                                                 
endfor                                                                          
axis equal                                                                      
view (30, 20)
title ("Using jet (64), every other tetrahedron invisible")