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Changing the alpha of the second texture (the 0.5 value is the amount)

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material Overlay/TwoTextures 
 { 
   technique 
   { 
      pass 
      { 
               texture_unit 
               { 
                     texture_alias BaseTexture
                     texture texture1.png 
               } 
               texture_unit 
               { 
                     texture_alias MixTexture
                     texture texture2.png 
                     colour_op_ex blend_manual src_texture src_current 0.5 
               } 
       } 
   } 
 }

c++ code:

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static_cast<MaterialPtr>( MaterialManager::getSingleton( ).getByName( "Overlay/TwoTextures" ) ) 
         ->getTechnique(0)->getPass(0)->getTextureUnitState("MixTexture")-> 
         setColourOperationEx(LBX_BLEND_MANUAL, LBS_TEXTURE, LBS_CURRENT, 1,1, add);

// PB3: Was "(this code doesn't really correspond 😐, could someone fix it?)", I did 😊
Personally I would clone the material first otherwise every object that uses this material would have the exact same mixing of the second texture.

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