an old scene with megapov 0.7 works with :
#declare yVal = hf_height_at(xPos, zPos, theHeightField);
now with megapov 1.0, i get this error message :
#declare yVal = hf_height_at <---- ERROR
Parse Error: Cannot assign uninitialized identifier.
ho ho... megapov 1.0 has killed "hf_height_at" ??
