look into the trace() function. It is what you are looking for.

"Bytter" <nomail@nomail> wrote:
> Hi!
>
> I'm using an height-field in my scene, and I want to translate a couple of
> objects in the Y (vertical) coordinate using the same ammount as defined in the
> height-field.
>
> As a typical scenario, I have an height-field with a grass texture, and I want
> to fill it with flowers.
>
> Thanks in advance,
>
> Hugo Sereno Ferreira

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