message: updates from code review feedback
  remove unused variable
diff: @@ -58,9 +58,6 @@ bool intersectAndSampleTet(void *uniform userData,
  float z2 = d2 / h2;
  float z3 = d3 / h3;
  - // The sum of the location coordinates should add up to approximately 1.
  - float z_total = z0 + z1 + z2 + z3;
  -
  // Field/attribute values at the tetrahedron corners.
  float v0 = self->field[t.x];
  float v1 = self->field[t.y];
  