# finding the normal on a plane for two known objects

Discussion in 'Scripting' started by garrilla, Mar 17, 2019.

1. ### garrilla

Joined:
Jan 12, 2016
Posts:
12
I'm trying to find the 'point of reflection' on a plane for two known objects in 3space

I can't work it out from the manual

any guidance gratefully recieved

2. ### WarmedxMints

Joined:
Feb 6, 2017
Posts:
594
Do you just want to centre point between two vectors? If so, just use Vector3.Lerp.
Code (CSharp):
1. pointOfReflection = Vector3.Lerp(ObjA.position, ObjB.position, 0.5f);

3. ### garrilla

Joined:
Jan 12, 2016
Posts:
12
I'm trying work out where the point of relection would be on a plane

lets say I
Vector3 plane = new vector3(0, 2, 1); // scale of 1,1,1,
vector3 objA = new Vector3(1,1,2);
vector3 objB = New Vector3(2,2,4);

there is a point of reflection on the plane, a point where a normal would be if ObjA were an object of incidence and objB an object of reflection.

think of like a ray, but instead of knowing the starting point and the direction and distance of the 1st reflection, I know only the object and its reflection, not the point the on the plane where it reflects