Unity3d：將一個游戲對象向另一個游戲對象的前向矢量旋轉

Question

        BackCube.position = cameraEye.position - cameraEye.forward * 2;

        float back = cameraEye.position.z - 2f;
        BackCube.position = new Vector3(BackCube.position.x, BackCube.position.y, back);

        var lookPosBack = cameraEye.position - BackCube.position;
        lookPosBack.y = 0;
        var rotationBack = Quaternion.LookRotation(lookPosBack);
        BackCube.rotation = Quaternion.Slerp(BackCube.rotation, rotationBack, 1);

所以，我想我的BackCube朝正向旋轉矢量cameraEye 。 上面的代碼看起來在cameraEye ，但不是朝着正向矢量cameraEye 。 我希望彼此指向的正向向量彼此相距2個單位。 我只能控制BackCube

Answer 1

這工作了！

Vector3 direction = Vector3.ProjectOnPlane(cameraEye.forward, Vector3.up);


BackCube.transform.position = cameraEye.position - direction.normalized * 2;


var lookPosBack = cameraEye.position - BackCube.position;
lookPosBack.y = 0;
var rotationBack = Quaternion.LookRotation(lookPosBack);
BackCube.rotation = Quaternion.Slerp(BackCube.rotation, rotationBack, 1);