thanks man for replying it was so kind of you …
i tried to make array of actor but the problem is it won’t connect material target with the array ( primitive not compatible with actor reference) …
here screen shot…
and i saw your tags method before on some question and tested it and it worked but with class blueprint , i did not know how to make it work in level blueprint
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and regarding to drop the flip-flop not … i did not understand why … as i understand from watching many tutorial it is the best way to flip between 2 materials … and i tried deleting it but i lost the flip between the two materials … maybe i did not explain so here is an attached image for what i meant by pressing x …
![alt text][3]
as u can see not all the object turn to white together and turn to gold together