Unity中的一些算法

1，三维空间中角色朝向鼠标位置

public void Turn()
{
    Ray ray=Camera.main.ScreenPointToRay(Input.MousePosition);
    Vector3 vector=player.transform.position-Camera.main.transform.position;
    Vector3 direction=(vector.y/ray.direction.y)*ray.direction-vector;
    player.transform.LookAt(player.transform.position+direction);
}

2，将某个向量映射到另一个三维空间(transform，right为x轴，up为y轴，forward为z轴)中

public Vector3 Remap(Vector3 source)
{
    float x=Vector3.Dot(transform.right,source);
    float y=Vector3.Dot(transform.up,source);
    float z=Vector3.Dot(transform.forward,source);
    return new Vector3(x,y,z);
}