Moving an object sideways using something similar to camera.getForwardRay()

Questions
1

I’m currently doing something like

var direction = camera.getForwardRay().direction;
hero.position.x += direction.x * 10;
hero.position.y += direction.y * 10;
hero.position.z += direction.z * 10;

and it works the way I like it; move towards where the camera is facing, but how can I move it sideways relative to where the camera is facing?

2

I guess you could do a cross product between the direction and the camera up vector to find the side one.

3

You can use getDirection with (1,0,0) as the local axis. (0,1,0) is local up and (0,0,1) is lcoal forward

4

Thank you, worked like a charm