Fading on additional materials to a section of an object I have a texture mapped material with additional bump maps, etc.  It looks fine.  I have created a shape animation where one end of the object becomes cratered (concave).  Inside the crater the material needs to gradually change to another color.  I have assigned the vertex group (inside of crater) the new material, but I can't figure out how to 'fade' it in while the object changes shape.  This is using cycles.



I'd upload the file but the client is sensitive about his IP.

Thanks for anyone's time
To fade from one colour to another you add keyframes to the factor of a mix node.



You can also get more control by using an animation to control which colour is used. Dynamic paint could be used to create the image sequence.