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The resultant of 3 normals

Discussion in 'Scripting' started by MikeyJY, Jun 24, 2020.

  1. MikeyJY


    Mar 2, 2018
    Yesterday I created an thread about Terrain normal. I figured it with the help of users which post in the thread and I'm very proud of the result:
    In the video the cyan arrow is the normal of terrain, and I snapped the object on terrain sample height and it fits the terrain. When I place on the flat surface the angle between y-axis and normal is 0, so I know it is working:

    However, I want to add the feature to player to rotate the building around the y axis, but when I do this:

    (I calculate all in OnGizmosDraw to test in editmode - i'll move in LateUpdate)

    The terrain fit breaks because the normal is calculated at the pivot and doesn't take care of y rotation so it works only when it is rotated default:

    I think that I need to calculate 3 normal vectors at the extreme points of the object and somehow to compose the 3 vectors and find the resultant of them

    [If a moderator sees this sorry if I posted so many threads in last week, but I'm very motivated to finish my project, and maybe I choose a project to ambitious for my limited knowledge, but I'm about to finish and I can't give up]
    Last edited: Jun 24, 2020
  2. MikeyJY


    Mar 2, 2018
    I have the solution. It is so simple:
    Code (CSharp):
    1. RaycastHit hit;
    2.             if (Physics.Raycast(Blueprint.transform.position, Vector3.down, out hit))
    3.             {
    5.                 Blueprint.transform.rotation = Quaternion.FromToRotation(Blueprint.transform.up, hit.normal) * Blueprint.transform.rotation;
    6.             }
    It is a little bit glitchy, but still amazing: