On 22-2-2017 13:17, Thomas de Groot wrote:
> This version does interesting things, different from the previous one. I
> am not entirely sure if it solves the problem and I need to investigate
> further.
>

I think it is worthwhile to re-think the random starting point code as 
the existing one has not a coverage including the complete terrain.

I use RRand() from rand.inc (to be included into the scene) in the 
following manner:

First, add the following lines after the height_field making:

#declare Min = min_extent(Terrain);
#declare Max = max_extent(Terrain);

Then replace the line:

   #declare Pos = trace(ThisTerrain, <rand(r)-.55, 10*Flattening, 
rand(r)-.55>*0.9*TS, -y);

by:

   #declare Pos = trace(ThisTerrain, <RRand(Min.x, Max.x, r), 
10*Flattening, RRand(Min.z, Max.z, r)>, -y);

The result is shown in the attached image, searching for 100 streams I 
commented out the black cones).

-- 
Thomas

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