Peter Lang wrote:
>Hello,
>I am just trying to understand the function of isosurface .
>As I understand the surface of an object is just there where the function
>get zero
>So I get a simple sphere with the following:
>isosurface {  function { pow(x,2) + pow(y,2) + pow(z,2) - 1   }
>
>But I thougt if I take the funktion to the sqare there should be no
>difference
>because the square of zero is still zero
>But
>isosurface {  function { pow( (pow(x,2) + pow(y,2) + pow(z,2) - 1) ,2)  }
>gives no object.
>please tell me why
>
>peter
>

POV ray renders a surface only when the values cross zero. That function is
positive (and above or equal to the threshold value) in it's whole range.

Post a reply to this message