"Mr" <nomail@nomail> schreef in bericht 
news:web.4b7aa47193a56a007c139aae0@news.povray.org...
>
> Yes, Thomas, I have tried PovTree, but the only version (1.5) I could find 
> (on
> the internet archive)
> http://web.archive.org/web/20051101175949/propro.ru/go/Wshop/povtree/povtree.html
> ....has greyed out export possibilities. That's too bad because it would 
> have
> alowed me to generate a dummy mesh for the purpose of growing Ivy and a 
> higher
> res blob based tree for rendering.

That is strange, because my copy of 1.5b (1) saves to blobs and (2) exports 
to POV-Ray mesh (mesh2 and obj are greyed out; they were supposed to be 
further implementations by Gena, which he never found time apparently to 
complete).


> And as to the other two programs, their free versions have limitations. 
> Thanks
> anyway.

Limitations indeed in maximum size. However, you can overcome that 
limitation by using the height_fields as functions and applying a little 
warp to them. Trick offered to us by Kirk Andrews IIRC. Example:
#declare F_HF =
function {
  pigment {
    image_map {
      png "My_hf_map.png"
      map_type 0
      interpolate 2
    }
    warp {repeat x}
    warp {repeat y}
    scale 50
    warp {
      turbulence 0.2
      octaves 1 //[6]
      lambda 1  //[2]
      omega 0.2 //[0.5]
    }
    scale 1/50
  }
}


Thomas

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