TC schrieb:

> Doesn't the detail level change automatically with image_width / 
> image_height?
> 
> A texture should produce a higher level of detail automatically.

Procedural textures, as used by POV-Ray, inherently provide unlimited 
detail anyway, regardless of resolution.

> Or do you mean something like #NoOfTreesToPlant= image_width*image_height / 
> AnyReasonableNumber?

Yes, something along those lines.

> Can image_width be accessed in povray? 

Yes, of course. It is commonly used to make sure the camera parameters 
match the output image aspect ratio, as in:

   camera {
     ...
     up    y
     right x*image_width/image_height
   }

but it can be used for any other purpose you deem fit.

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