VectorUtils.cs

using System;
using UnityEngine;

public static class VectorUtils
{
    public static Vector3 GetIntegerCopy (this Vector3 v)
    {
        return new Vector3(Mathf.Round(v.x), Mathf.Round(v.y), Mathf.Round(v.z));
    }

    public static float Get2DRoll (this Vector3 v)
    {
        float roll = Vector3.Angle(Vector3.up, v);

        if (v.x < 0)
            roll = -roll;

        return roll;
    }

    public static Quaternion Get2DRotation (this Vector3 v)
    {
        return Quaternion.Euler(0f, 0f, Get2DRoll(v));
    }

    public static Vector3 RollToward (this Vector3 v, Vector3 target, float t)
    {
        float interpAngle = Mathf.LerpAngle(v.Get2DRoll(), target.Get2DRoll(), t);
        return Quaternion.Euler(0f, 0f, interpAngle) * Vector3.up;
    }

    public static string ToSimpleString (this Vector3 v)
    {
        return string.Format("[{0:0.00} {1:0.00} {2:0.00}]", v.x, v.y, v.z);
    }

    public static string ToSuperSimpleString (this Vector3 v)
    {
        return string.Format("[{0:0.0} {1:0.0} {2:0.0}]", v.x, v.y, v.z);
    }

    public static Vector3 ParseSimple (string s)
    {
        s = s.Substring(1, s.Length - 2);
        var tokens = s.Split(' ');
        return new Vector3(int.Parse(tokens[0]), int.Parse(tokens[1]), int.Parse(tokens[2]));
    }
    
    public static Vector3 LerpAngle (Vector3 start, Vector3 end, float t)
    {
        float angle = Vector3.Angle(start, end);
        Quaternion rotation = Quaternion.Euler(0,0, angle * t);
        return rotation * start;
    }
}