Why must we do yvelocity for jump or drop down

[Wertyboy]

Why? what happen when use y for jump or something?

[Chai]

because it's easier.

[Hblade]

The same thing

[lcl]

It is also possible to do with y, but it's harder. Anyway, I like your question werty. It's good to think other ways of doing things.

[Chai]

LCL gives me a strong point of your question.
Thank you for giving me another way of thinking.

[DilloDude]

Setting the yvelocity gives it a constant speed. If you just change the y, it will only move once. You can create your own variable to represent yvelocity, and add it to y every frame on a draw actor event, which does give you some advantages if you want to do more fancy things, but for normal situations, yvelocity is simpler.