Unity can rotate vector around any axis at any angle

Time:2021-4-19

This example for you to share the unity around any axis rotation vector at any angle of the specific code, for your reference, the specific content is as follows

There is a demand in the game, that is, a rectangle or cube rotates at any angle around a certain point. Now, the following algorithm is given.


public static Vector3 RotateRound(Vector3 position, Vector3 center, Vector3 axis, float angle)
  {
    Vector3 point = Quaternion.AngleAxis(angle, axis) * (position - center);
    Vector3 resultVec3 = center + point;
    return resultVec3;
  }

test case


using UnityEngine;
using System.Collections;
 
public class RotateTest : MonoBehaviour 
{
  public LineRenderer line1;
  public LineRenderer line2;
  public float angle = 30f;
  
  private Vector3 v0;
  private Vector3 v1;
  private Vector3 v2;
  private Vector3 v3;
  private Vector3 v4;
  private Vector3 vCenter;
  void Start()
  {
    v0 = new Vector3(3f,0f,1f);
    v1 = new Vector3(1f, 0f, 3f);
    v2 = new Vector3(4f, 0f, 6f);
    v3 = new Vector3(6f, 0f, 4f);
    vCenter = new Vector3(2f, 0f, 2f);
  }
 
 // Use this for initialization
 void Update () 
  {
   line1.SetVertexCount(5);
    line1.SetPosition(0,v0);
    line1.SetPosition(1,v1);
    line1.SetPosition(2,v2);
    line1.SetPosition(3,v3);
    line1.SetPosition(4,v0);
 
    line2.SetVertexCount(5);
    Vector3 v01 = MathUtils.RotateRound(v0, vCenter, Vector3.up, angle);
    Vector3 v11 = MathUtils.RotateRound(v1, vCenter, Vector3.up, angle);
    Vector3 v21 = MathUtils.RotateRound(v2, vCenter, Vector3.up, angle);
    Vector3 v31 = MathUtils.RotateRound(v3, vCenter, Vector3.up, angle);
    Vector3 v41 = MathUtils.RotateRound(v4, vCenter, Vector3.up, angle);
    line2.SetPosition(0, v01);
    line2.SetPosition(1, v11);
    line2.SetPosition(2, v21);
    line2.SetPosition(3, v31);
    line2.SetPosition(4, v01);
 }
}

design sketch

 

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