These are the layers.cfg rvmat, texture and RGB values to be used with default BIS terrain ground textures.

The RGB values are set for L3DT attributes (mask) texture colors.

Use these RGB values with L3DT “desert” climate.

class Layers
{
	// asfalt broken down
	class tk_asfalt
	{
		texture = "ca\takistan\data\tk_asfalt_co.png";
		material = "ca\takistan\data\tk_asfalt.rvmat";
	};
 
	// beton, brown, broken down
	class tk_beton
	{
		texture = "ca\takistan\data\tk_beton_co.png";
		material = "ca\takistan\data\tk_beton.rvmat";
	};
 
	// big rocks
	class tk_dlazba_old
	{
		texture = "ca\takistan\data\tk_dlazba_old_co.png";
		material = "ca\takistan\data\tk_dlazba_old.rvmat";
	};
 
	// forest, rocks, sand
	class tk_forest
	{
		texture = "ca\takistan\data\tk_forest_co.png";
		material = "ca\takistan\data\tk_forest.rvmat";
	};
 
	// sand
	class tk_hlina
	{
		texture = "ca\takistan\data\tk_hlina_co.png";
		material = "ca\takistan\data\tk_hlina.rvmat";
	};
 
	// rocks, sand
	class tk_mountain
	{
		texture = "ca\takistan\data\tk_mountain_co.png";
		material = "ca\takistan\data\tk_mountain.rvmat";
	};
 
	// grass and dried grass
	class tk_plevel
	{
		texture = "ca\takistan\data\tk_plevel_co.png";
		material = "ca\takistan\data\tk_plevel.rvmat";
	};
 
	// green grass
	class tk_pole
	{
		texture = "ca\takistan\data\tk_pole_co.png";
		material = "ca\takistan\data\tk_pole.rvmat";
	};
 
	// rocks, sand
	class tk_polopoust
	{
		texture = "ca\takistan\data\tk_polopoust_co.png";
		material = "ca\takistan\data\tk_polopoust.rvmat";
	};
 
	// rock, mountain rock face
	class tk_skala
	{
		texture = "ca\takistan\data\tk_skala_co.png";
		material = "ca\takistan\data\tk_skala.rvmat";
	};
 
	// sand rough, rocks
	class tk_skalni_sterk
	{
		texture = "ca\takistan\data\tk_skalni_sterk_co.png";
		material = "ca\takistan\data\tk_skalni_sterk.rvmat";
	};
 
	// sand fine, small rocks
	class tk_sterk_na_dno
	{
		texture = "ca\takistan\data\tk_sterk_na_dno_co.png";
		material = "ca\takistan\data\tk_sterk_na_dno.rvmat";
	};
 
	// sand, grass
	class tk_trava
	{
		texture = "ca\takistan\data\tk_trava_co.png";
		material = "ca\takistan\data\tk_trava.rvmat";
	};
 
	// sand rough, rocks
	class tk_valouny
	{
		texture = "ca\takistan\data\tk_valouny_co.png";
		material = "ca\takistan\data\tk_valouny.rvmat";
	};
};
 
class Legend
{
	picture = "tut\terrain_data\source\mapLegend.png";
 
	class Colors
	{
		// color names should correspond to surface layer names
		tk_asfalt[] = {{ 0, 0, 0 }};
		tk_beton[] = {{ 0, 0, 0 }};
		tk_dlazba_old[] = {{ 0, 0, 0 }};
		// forest, rocks, sand
		tk_forest[] = {{ 230, 230, 120 }};
		// sand - "Deep desert"
		tk_hlina[] = {{ 236, 230, 149 }};
		// rocks, sand - "Desert rocks (3)"
		tk_mountain[] = {{ 226, 207, 129 }};
		tk_plevel[] = {{ 0, 0, 0 }};
		tk_pole[] = {{ 0, 0, 0 }};
		// rocks, sand - "Desert cliffs"
		tk_polopoust[] = {{ 196, 177, 121 }};
		// rock, mountain rock face - "Desert cliffs (2)"
		tk_skala[] = {{ 181, 158, 111 }};
		tk_skalni_sterk[] = {{ 0, 0, 0 }};
		// sand fine, small rocks
		tk_sterk_na_dno[] = {{ 220, 210, 100 }};
		tk_trava[] = {{ 0, 0, 0 }};
		// sand rough, rocks
		tk_valouny[] = {{ 228, 215, 137 }};
	};
};

Sorry there are these also but we don't have bis original RVMATs so there is no layers.cfg written for them.

// desert gravel sand + small rocks
ca\desert_e\data\de_polopoust.rvmat
ca\desert_e\data\de_polopoust_co.paa

// desert rough gravel sand + rocks
ca\desert_e\data\de_skalni_sterk.rvmat
ca\desert_e\data\de_skalni_sterk_co.paa

// desert sand + dry grass
ca\desert_e\data\de_trava.rvmat
ca\desert_e\data\de_trava_co.paa

// satellite out texture
//ca\desert_e\data\s_satout_co.paa