I'm not using nodes, just 2 material with 2 different uvmap texture to it
I want to assign material A at frame 1 and material B at frame 2
pressing I on scene don't give me any option to animate material
please help thanks
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Great opportunity for you to start learning how to use nodes then! Because the only way I know for animating a transition between two materials is with nodes.
In the node editor, add the two shaders you want (Shift + A --> Shader), then from the same menu also add a "Mix Shader". Plug in both shader nodes into the mix shader, and animate the Factor to control the transition between the two.
A value of 0 means only the first shader plugged in takes effect, while a value of 1 shows only the 2nd shader. Any value in between is a mixture of the two.
Please see my related answer also: How to animate Texture change in Blender Internal