Which value need to write into projectile movement speed? m/s or ft?
And which the best value for projectile gravity scale?
Here is some good documentation about Projectile Movement | Unreal Engine Documentation.
For Unreal Engine, the values for projectile movement speed are usually specified in units per second, usually meters per second (m/s).
As for the best value for projectile gravity scale, it depends on the desired behaviour and look of the projectile. The gravity scale value determines the strength of the gravitational pull on the projectile. A value of 1 would be equal to Earth’s gravitational acceleration (9.8 m/s^2), while a value of 0 would mean the projectile is not affected by gravity. Values greater than 1 can be used to simulate stronger gravitational pull, while values less than 1 can be used to simulate weaker gravity. The exact value you use will depend on the desired behaviour and look of the projectile.
Thank you very much!