Is there a way to set an actor variable to none/NULL and a way to check if it is NULL/none?
Yes! Simply leave the get / set field blank.
If you already had set something, clear it selecting (None) from the dropdown.
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Old thread but if anyone is searching for this (like I was), the Actor has a pull-off node ‘Is Valid?’ for just this problem.
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What node is the “|=” node? Unfortunately, I can’t search for it that way, and I can’t find it without knowing the proper name.
It is a “!=” node, not a “|=” node. In text, the “!=” node is the “NotEqual” node.
Just dont hook up a SET node for your variable you want to clear.