In article <39747813.ECD7B37A@itam.cas.cz>, Vaclav Cermak 
<dis### [at] itamcascz> wrote:

>   I'am playing with ridgedfm heightfield and I'am trying
>   to place some "trees" (cylinders, right now ;-) on it.
>   But something is wrong: when I made box, sphere,
>   isosurface with function { y } instead of heightfield,
>   it works. When I use ridgedmf, or noise, or pigment
>   in fuction it is unable to fund intersection of rays
>   with hf. But is heightfield itself displays correctly.

Try increasing the accuracy of the isosurface.

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Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
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