Sorry but I am really struggling with this, I have no idea how to put a function
in a heightfield because I only find examples with images, can someone make a
simple example for me to see?
I tried this just to test:

height_field {
   function {
    sin(x * 0.1) * 5
  }
  smooth
  scale <100, 100, 100>

}
but it give me a error in "funcion {"
error:
expected numeric expression, { found instead

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