If the Problem is transparent / sorting related this may help ( old example from wiki ), if not iam sry:
Code:
MATERIAL* mat_alphatest=
{
  effect =
  "
    technique alpha_test
    {
      pass p0
      {
        zWriteEnable = true;
        alphaTestEnable = true;
        alphaBlendEnable = false;
      }
    }
  ";
}

action apply_alphatest_material(){
  my.material = mat_alphatest;
}
i just converted from wiki to lite-c. but did not test.

Greets

Acknex umgibt uns...zwischen Dir, mir, dem Stein dort...
"Hey Griswold ... where u gonna put a tree that big ?"
1998 i married my loved wife ... Sheeva from Mortal Kombat, not Evil-Lyn as might have been expected
rayp.flags |= UNTOUCHABLE;