In part 3 of the series I go over some simple vector math that is mandatory to understand when making games. As a small cheat sheet:
Adding vectors can be used to convert local space to world space.
Subtracting vectors can be used to measure distance.
Multiplying normalized vectors by floats can be used to set their length.
Division isn't too common, but dividing by a float can be used to help find midway points.
Part 1 - Events: https://youtu.be/S9KforwzAAU
Part 2 - Actor References: https://youtu.be/SCam31QJz3c
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UE4 With Casey - Mastering Blueprints - Part 3 - Vector Math | NatokHD