> But it seems that one of the texture (the first texture)
> disappears, or at least is not put on the first point. Instead, the
> second texture is on the first point and the third texture is used
> on the second and third points. 

Confirmed.

> triangle { <-1,0,0>,<0,1,0>,<0,0,0> texture_list{ T1 T2 T3 }  }   
> triangle { <0,0,0>,<0,1,0>,<1,1,0> texture_list { T3 T1 T2 }  }  
> triangle { <0,0,0>,<1,1,0>,<1,0,0> texture_list { T2 T3 T1 }  }  
 
If you put commas in the texture list, the result changes and not for 
the better.

Ingo

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