> Do I want atmospheric scattering on or off?  That affects which are the  
> top two sliders.

You want atmospheric scattering on. Then the top sliders are 'Landmass' and 
'Transition'. These you want at 5. 

What did it take to make the correct dialog appear? Are you sure you have the 
updated effects and shader code? For instance, terrain-default.eff should 
contain the new texture declarations with indices 11 and 12 in the initial 
parameter section. Is that the case in your file?

<texture n="11">
        <image>Textures/Terrain/void.png</image>
        <filter>linear-mipmap-linear</filter>
        <wrap-s>repeat</wrap-s>
        <wrap-t>repeat</wrap-t>
        <internal-format>normalized</internal-format>
</texture>
<texture n="12">
        <image>Textures/Terrain/void.png</image>
        <filter>linear-mipmap-linear</filter>
        <wrap-s>repeat</wrap-s>
        <wrap-t>repeat</wrap-t>
        <internal-format>normalized</internal-format>
</texture>

>But I'm not seeing anything different in the ground textures.  Or do I need to 
>have some 
> sort of custom scenery installed that references the new material definitions?

No, the overlay textures are declared in the materials file, no custom scenery 
required. For instance, ShrubCover in summer should contain a block

 <texture-set>
   <texture>Terrain/shrub1.png</texture>
   <texture n="11">Terrain/grass_hires.png</texture>
   <texture n="12">Terrain/dirtrock.png</texture>
  </texture-set>

which defines the overlay textures in addition to the base texture. So this 
works in default scenery. 

You would notice when it's on - the result looks very different from the base 
texture alone.

* Thorsten
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