OKOK so its like adding a new property to the shader what will do the trick. In the case that decal texture is not applied with the modified shader it will look the same as now? Because the models will also be used online and at this moment I don´t know if I will be able to transfer the decal texture data One last question. I see the car example, this is totally mind blowing. The thing is, how is that texture saved? It does create a new texture file that needs to be applied to the shader in runtime? In that case, the texture can be opened in photoshop for fine tuning?