ColorOps[X]=Add;//Where X is the stage number range from 0 to number of layers

ColorOps[X]=DOT3//Or something like that

//////////////////////////////////////////////////////////////////////
// terraintex.fx
// Terrain material for an unlimited number of terrain textures
// Tiled texture on RGB, mask on alpha 

Texture entSkin1; // basic tiled terrain texture
Texture LightMap; // lightmap created by the map compiler

bool PASS_SOLID; // enforce rendering on the solid pass

bool AUTORELOAD;

//////////////////////////////////////////////////////////////////////

// technique without lightmap
technique terraintex
{
   pass multi_repeat11
   {
      ZWriteEnable = True;
		AlphaBlendEnable = True;
		SrcBlend = SrcAlpha;
      DestBlend = InvSrcAlpha;
		
		Texture[0] = <entSkin1>;
		TexCoordIndex[0] = 0;
		AlphaOp[0] = SelectArg1;
		AlphaArg1[0] = Texture;
		
		Texture[1] = <entSkin1>;
		TexCoordIndex[1] = 1;
      ColorArg1[1] = Texture; 
	   ColorArg2[1]= Diffuse;
	   ColorOp[1] = Modulate4x;
	   AlphaArg1[1] = Current;
	   AlphaOp[1] = SelectArg1;

	   ColorOp[2] = Disable;
	   AlphaOp[2] = Disable;
	}
}

// technique with lightmap
technique terraintex_lm
{
	pass multi_repeat11
	{
      ZWriteEnable = True;
		AlphaBlendEnable = True;
		SrcBlend = SrcAlpha;
      DestBlend = InvSrcAlpha;
		
		Texture[0] = <entSkin1>;
		TexCoordIndex[0] = 0;
		AlphaOp[0] = SelectArg1;
		AlphaArg1[0] = Texture;
		
		Texture[1] = <LightMap>;
		TexCoordIndex[1] = 0;
      ColorArg1[1] = Texture; 
	   ColorArg2[1]= Diffuse;
	   ColorOp[1] = AddSigned;
	   AlphaArg1[1] = Current;
	   AlphaOp[1] = SelectArg1;

		Texture[2] = <entSkin1>;
		TexCoordIndex[2] = 1;
      ColorArg1[2] = Texture; 
	   ColorArg2[2]= Current;
	   ColorOp[2] = Modulate2x;
	   AlphaArg1[2] = Current;
	   AlphaOp[2] = SelectArg1;

	   ColorOp[3] = Disable;
	   AlphaOp[3] = Disable;
	}
}

// fallback if nothing works
technique fallback { pass one { } }