How to make object stay certain distance above ground (relative o ground normal)

Question

I am making a game where an object must stay 8 units above the ground at all times. I can do this easily with flat ground since you just add 8 to the hit.point property of the raycast and assign it to the y component of the position of the object, however this does not work when the ground is upside down, vertical, diagonal, etc. I want it relative to the ground normal. So 8 units above (locally) an upside down ground would really be 8 units down in world axis. How would I achieve this? I know some raycasting needs to be done probably, however I am not sure how to approach this.

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Answer by toishaanpatel · Nov 28, 2020 at 04:40 AM

Nevermind, I seemed to have figured out my problem. For anyone else that is interested, ere is what I got.

          //shoot a raycast relatively downwards
          if (Physics.Raycast(transform.position, -transform.up, out hit, Mathf.Infinity)) 
                 {
                     Vector3 pos = hit.point; //get the position where the ray hit the ground

                     //shoot a raycast up from that position towards the object
                     Ray upRay = new Ray(pos, transform.position - pos); 
 
                     //get a point (vector3) in that ray 8 units from its origin
                     Vector3 upDist = upRay.GetPoint(8); 

                      //smoothly interpolate its position
                     transform.position = Vector3.Lerp(transform.position, upDist, ); 
                 }

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How to make object stay certain distance above ground (relative o ground normal)

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