Rotating parent and positioning child between parent and camera.

Questions & Answers
1

I have a parent/child object structure.

I’m positioning the child so it always sits on the vector between the parent and the camera.

The following code is attached to the child.

Vector3 diff =   Camera.main.transform.position-this.gameObject.transform.parent.position;
Vector3 unitVector =   Vector3.Normalize (diff);
this.transform.localPosition = (10f * unitVector);

If I rotate the parent, this child is no longer between the camera and the parent.

So, I thought all I’d need to do would be to rotate the unit Vector by the rotation applied the parent or, rotate the child back by this angle.

I was wrong.

I’m unsure as to why this wouldn’t work?

2

Hi Rickw

Firstly, an architecture nag: ideally a child should not be aware of it’s parent. Have you considered moving this code into the parent?

I think the main problem with your code is you’re overthinking things. Check this out:

Vector3 cameraPosition = Camera.main.transform.postion;
Vector3 midPoint = (transform.position + cameraPosition) / 2.0f;
myChild.transform.position = midPoint;

No need to worry about calculating distance or normalizing things. You just need to get the midpoint and set the WORLD position of the child.