Paul Jones wrote:
> 
> Sorry....
> 
> What I want is this: To take a height field, which may or may not be
> visible, and to create a series of closed loops, each loop sitting on a
> specific elevation and encompasing only one "hill" of the hf. Now,
> imagine that I apply a gradient y pigment to the hf, it would be
> possible to get this effect, except that I want each "countour line" to
> be 3-dimensional, like a pipe.
> 

That makes things clearer...

I think it should be possible with an isosurface:

use the data for an image_pattern instead of the heightfield and use a
color_map similar to the one Warp suggested like:

color_map {
  [0.00 rgb 0]
  [0.59 rgb 0]
  [0.60 rgb 1]
  [0.61 rgb 0]
  [1.00 rgb 0]
}

Of course that's not enough, because the image_pattern is only 2d.  You
have to add a function for the y direction, for a round pipe it has to be
some trigonometric function.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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