The dynamic material has been given target in the previous blueprint, and I try to set its opacity from 1 to 0 like the screenshot. But its opacity does not change in running.
You should debug your code:
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Check your dynamic material with IsValid
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Print the alpha value:
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Check opacity in the Material Editor.
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Make sure that you assign the material where you want.
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Check the param name. Sometimes it contains whitespace.
