Is it possible to detect whether the mouse wheel is scroll up or down?
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You can use the MouseWheelDelta() expression on native platform, it doesn’t work in HTML5.
To use it, just go to Other->Compare two expressions and enter
Expression 1
MouseWheelDelta()
Sign of test
Expression 2
enter 1 to check if mouse is scroll up or -1 to check if mouse is scroll down
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Don’t use equal for that, just compare with 0 because it can be greater than 1 or less than -1.
I thought the expression return 1 and -1 only depends on the direction of scroll.
I mean I tried and doesn’t seem to effect how many times I scroll up or down the expression always returns 1 or -1 
What am I missing?
EDIT://
Ah I see. I have just tried < 0 and > 0 and sometime it does return 2 and -2 but since every scroll is count, 99.9% of the times it end up with 1 and -1, so it should be not a problem unless you really do want to scroll the wheel only a single time each time 
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Thanks guys!