Unity sharedMesh 制作波浪

待我称王封你为后i 2022-06-02 04:55 217阅读 0赞

![这里写图片描述][20180104114751831]

通过改变网格的顶点坐标来实现波浪效果

波浪图片随便网上找一张，然后丢给材质球的 Albedo 属性中。  
然后将材质球和脚本，拖入 Plane 游戏对象。

![这里写图片描述][20180104120456931]

修改材质球的 Main Maps 参数中的 Tiling 值，使纹理贴图在XY平面上重复多次（这样可以使用较小的贴图，从而降低所需内存和游戏大小）。

using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    
    /// <summary>
    /// 叠加方式
    /// </summary>
    public enum Superposition {
        /// <summary>
        /// 周期叠加
        /// </summary>
        Cycle,
        /// <summary>
        /// 震幅叠加
        /// </summary>
        Amplitude 
    }
    
    public class WaterWave : MonoBehaviour {
    
        /// <summary>
        /// 水波震幅
        /// </summary>
        public float amplitude = 1f;
        /// <summary>
        /// 波动的速度
        /// </summary>
        public float speed = 3f;
        /// <summary>
        /// 震幅叠加方式
        /// </summary>
        public Superposition superposition = Superposition.Cycle;
    
        /// <summary>
        /// 模型网格
        /// </summary>
        private Mesh sharedMesh;
        /// <summary>
        /// 网格的初始顶点坐标数组
        /// </summary>
        private Vector3[] baseVertex;  
        /// <summary>
        /// 网格修改后的顶点坐标数组
        /// </summary>
        private Vector3[] nowVertex;  
    
        // Use this for initialization 
        void Start ()   
        {  
            sharedMesh = GetComponent<MeshFilter>().sharedMesh;  
            baseVertex = sharedMesh.vertices;  
            nowVertex = sharedMesh.vertices;  
        }  
    
        // Update is called once per frame 
        void Update ()   
        {  
            for (int i = 0; i < baseVertex.Length; i++) {  
                nowVertex [i] = baseVertex [i];  
    
                switch (superposition) {  
                case Superposition.Cycle:
                    nowVertex [i].y += Mathf.Sin (Time.time * speed + baseVertex [i].x + baseVertex [i].z) * amplitude;  
                    break;
                case Superposition.Amplitude:
                    nowVertex [i].y += Mathf.Sin (Time.time * speed + baseVertex [i].x) * amplitude + Mathf.Sin (Time.time * speed + baseVertex [i].z) * amplitude;
                    break;
                }  
            }
            sharedMesh.vertices = nowVertex;  
        }  
    }

注意：sharedMesh是公用的，是引用传递。而mesh是值传递，是各自拥有的实例。这里如果使用mesh会报内存泄漏（memory leak）

[20180104114751831]: /images/20220602/a210af844d674f9a830da6369639433a.png
[20180104120456931]: /images/20220602/7c048173eb434c11b2cae7635d4f48c6.png