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Resolved [Splines] How to determine/evaluate if a knot has been passed/reached?

Discussion in 'World Building' started by ManuelRauber, Jan 8, 2023.

  1. ManuelRauber

    ManuelRauber

    Joined:
    Apr 3, 2015
    Posts:
    113
    Hi!

    I'm currently fiddling around with the Unity Splines package.

    At runtime, the player can click + drag to dynamically create a spline that an object will follow. I also use Spline Extrude to make the spline visible.

    Now, I want that as soon as the object "hits" or "passes" a knot that the passed knot is removed.

    However, I have a hard time figuring out when a knot has been passed. I'm simply using Spline.Evaluate to get the position and tangent which works well.

    Any idea how I can achieve this?

    Thanks!
     
    ManuelRauber, Jan 8, 2023
    #1

  2. kaarrrllll

    kaarrrllll

    Unity Technologies

    Joined:
    Aug 24, 2017
    Posts:
    537
    You can use
    Code (CSharp):
    1. public static float ConvertIndexUnit<T>(this T spline, float t, PathIndexUnit targetPathUnit)
    2.     where T : ISpline
    3.  
    to convert from a normalized interpolation ratio to PathIndexUnit.Knot. The knot index will be the integer part of the returned value.
     
    kaarrrllll, Jan 13, 2023
    #2
    GDevTeam and ManuelRauber like this.

  3. ManuelRauber

    ManuelRauber

    Joined:
    Apr 3, 2015
    Posts:
    113
    This is exactly what I was looking for. Thanks @kaarrrllll :)
     
    ManuelRauber, Jan 14, 2023
    #3
    GDevTeam and kaarrrllll like this.

  4. Ziplaw

    Ziplaw

    Joined:
    Sep 24, 2018
    Posts:
    3
    Now how would I do the reverse? What if I want to convert from Knot to normalized distance?, Better yet, how would I get the normalized position of a Knot in a given Spline
     
    Ziplaw, May 3, 2023
    #4

  5. ManuelRauber

    ManuelRauber

    Joined:
    Apr 3, 2015
    Posts:
    113
    Please open your own thread, instead of hijacking a resolved one. :)
     
    ManuelRauber, May 3, 2023
    #5