[Therion] Colouring ceiling formations?

[Benedikt Hallinger]

Hello again,

i want to define an optional layout in which some formations are colored 
differently, however i have no idea what to do.
Following the examples in the wiki, i tried:

-------
layout colorMap.layout
   symbol-colour group water  [30  30  95]    #this works! :)

   symbol-colour line chimney [0.95 0.15 0.15]   # no change :(
   symbol-colour line ceiling-meander [0.95 0.15 0.15]
endlayout
-------

The water color changes like expected, but the chimney and meander parts 
remain black :(
What am i doing wrong here?




Also the same occurs with sand and clay patterns, however here i did my 
custom version:

--------
code metapost
     % --- LEHM ---
     beginpattern(pattern_clay_AUT_HVHO);
       % Zeichnet einfach eine Reihe punkte an fixen X/Y Koordinaten
       pickup PenC;
       draw (0.20u, 0.30u);
       draw (0.35u, 0.70u);
       draw (0.40u, 0.40u);
       draw (0.60u, 0.50u);
       draw (0.80u, 0.10u);
      endpattern;
      def a_clay_AUT (expr Path) =
       T:=identity;
       %  thclean Path;
       %thfill Path withpattern pattern_sand_AUT ;  % original
       thfill Path withpattern pattern_clay_AUT_HVHO ;
     enddef;

     % --- SAND ---
     beginpattern(pattern_sand_AUT_HVHO);
       % Zeichnet einfach eine Reihe punkte an fixen X/Y Koordinaten
       pickup PenB;
       draw (0.20u, 0.20u);
       draw (0.40u, 0.60u);
       draw (0.80u, 0.40u);
       patternbbox(0u,0u, 1.0u,1.0u); % definiert Rechteckgroesse des Symbols
     endpattern;
     def a_sand_AUT (expr Path) =
       T:=identity;
       %  thclean Path;
       %thfill Path withpattern pattern_sand_AUT ;  % original
       thfill Path withpattern pattern_sand_AUT_HVHO ;
     enddef;
   endcode
---------

I think i need to tell Therion somehow to draw the line in the color 
specified using "symbol-colour".
I know i could duplicate metapost code and add my colors there, however i 
want to use the distributions symbol definitions here if possible 
(maintianing upwards compatibility).



Thank you very much!