Unity实现绕任意轴任意角度旋转向量

本文实例为大家分享了unity实现绕任意轴任意角度旋转向量的具体代码，供大家参考，具体内容如下

游戏中有一需求，就是一个矩形或者cube绕着某一点旋转任意角度，现在给出下面算法。

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;
  }

测试用例

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);
 }
}

效果图

 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。