How to make a material flash once?

Development Rendering
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1

I can use time node and sine node to make a flash loop, but I want it flash once not a loop, how to do it ?

2

Doing this in material only is unpractical (it would flash only after load, and you want to control when it flashes).

So you need material parameter, instanced material and drive that from blueprint.

Easiest would be with curve variable.

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