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一、效果展示

Unity实现模型移动、旋转和缩放功能

通过鼠标实现对模型的不同操作
鼠标中键点击，模型变为高亮状态，表示选中状态，再次点击其他地方，则取消高亮，表示未选中状态
鼠标中键上下滚动，实现模型的缩放
鼠标左键点击或长按，实现模型的移动
鼠标右键点击，左右滑动，实现模型的水平旋转；同时按下shift键，上下滑动，实现模型垂直旋转

二、实现完整代码

using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class ModelControl : MonoBehaviour
{private Material originalMaterial;      //模型原始材质private Material highlightMaterial;     //模型选中时的高亮材质private Renderer myRenderer;            //模型渲染组件private bool isSelect = false;          //模型是否被旋转// Start is called before the first frame updatevoid Start(){//确保模型在地面上方KeepOnGround();//新建一个高亮材质highlightMaterial = new Material(Shader.Find("Universal Render Pipeline/Lit"));highlightMaterial.color = Color.yellow;highlightMaterial.SetFloat("_Smoothness", 0.8f);highlightMaterial.SetColor("_EmissionColor", Color.yellow * 1.2f); // 开启自发光//获取原始材质myRenderer = GetComponent<Renderer>();if (myRenderer != null){originalMaterial = myRenderer.material;}//判断是否包含碰撞体组件，不包含直接添加if (GetComponent<Collider>() == null){gameObject.AddComponent<BoxCollider>();}}// Update is called once per framevoid Update(){if (Input.GetMouseButton(0)&&isSelect){//鼠标左键控制移动Drag();}if (Input.GetMouseButton(1)&&isSelect){//鼠标右键控制旋转Rotate();}float scroll = Input.GetAxis("Mouse ScrollWheel");if (Mathf.Abs(scroll) > 0.01f&&isSelect){// 鼠标中键滚轮：缩放模型Scale(scroll);}if (Input.GetMouseButton(2)){//鼠标中键点击，进行模型选中Select();}}/// <summary>/// 模型选中方法  选中显示高亮  否则选择原始材质/// </summary>public void Select(){Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);if (Physics.Raycast(ray, out RaycastHit hit)){//鼠标点击到模型if (hit.collider.gameObject == this.gameObject){myRenderer.material = highlightMaterial;isSelect = true;}else{//点击到别的模型myRenderer.material = originalMaterial;isSelect = false;}}else{//点击到空白处myRenderer.material = originalMaterial;isSelect = false;}}/// <summary>/// 模型移动方法/// </summary>void Drag(){Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);RaycastHit hit;if (Physics.Raycast(ray, out hit)){if (hit.transform.name == "Plane"){this.transform.position = hit.point;KeepOnGround();}}}/// <summary>/// 模型旋转方法 鼠标右键=左右旋转 shift+鼠标右键=上下旋转/// </summary>void Rotate(){       if (Input.GetKey(KeyCode.LeftShift)){float rotY = Input.GetAxis("Mouse Y") * 5f;this.transform.Rotate(Vector3.right, rotY, Space.World);}else{float rotX = Input.GetAxis("Mouse X") * 5f;this.transform.Rotate(Vector3.up, rotX, Space.World);}}/// <summary>/// 模型缩放方法/// </summary>/// <param name="scroll">缩放倍率</param>void Scale(float scroll){float scaleFactor = 1 + scroll;this.transform.localScale *= scaleFactor;KeepOnGround();}/// <summary>/// 确保模型在地面上方，防止穿模/// </summary>void KeepOnGround(){// 计算当前模型的边界包围盒Renderer renderer = GetComponentInChildren<Renderer>();if (renderer != null){Bounds bounds = renderer.bounds;float bottomY = bounds.min.y;float offsetY = transform.position.y - bottomY;float targetY = 0f; // 地面高度为0（可根据你的地面高度调整）Vector3 pos = transform.position;pos.y += targetY - bottomY;this.transform.position = pos;}}
}