Moving opposite of the direction

Basically say you have a direction, but you want to go the opposite way…
how do you do dat…

yeah, n00b question

you could try multiple the value with minus

int direction = 1;
System.out.println( ( -1 ) * direction );

or if you are using vector3f use .negate()

Vector3f b = new Vector3f(1f,1f,1f);
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This is probably worth reading and understanding: