another bunch of little changes

xperiment.inc

@@ -24,8 +24,9 @@ difference {
 			}
 	#end		// for
 	#local R = rand(Rng1);
-	#if (R < 0.42)	texture { LeGris }
-	#else		texture { T_Beton_1 }
+	#if (R < 0.42)		texture { LeGris }
+	#elseif (R < 0.64)	texture { T_Beton_2 }
+	#else			texture { T_Beton_1 }
 	#end
 	}
 #end