利用三角函数曲线模拟3D水面波动效果(Mesh顶点变化)
发表于2019-01-08
这里用的是正弦曲线：y=Asin(ωx+φ)+k
A——振幅，当物体作轨迹符合正弦曲线的直线往复运动时，其值为行程的1/2
(ωx+φ)——相位，反映变量y所处的状态
φ——初相，x=0时的相位；反映在坐标系上则为图像的左右移动
k——偏距，反映在坐标系上则为图像的上移或下移
ω——角速度， 控制正弦周期(单位弧度内震动的次数)
利用正弦曲线修改Mesh的Y值，实现波纹波动效果。
using UnityEngine;
using System.Collections;
[RequireComponent(typeof(MeshFilter))]
public class MeshWaterWave : MonoBehaviour
｛
public enum WaveType
｛
none,
simple,
multiply,
｝
//高度(振幅)
[SerializeField] float height = 0.5f;
//速度(初相)
[SerializeField] float speed = 1f;
//X/Z方向系数
[SerializeField, Range(-1, 1)] float xDirection = 1;
[SerializeField, Range(-1, 1)] float zDirection = 1;
//幅度(角速度)
[SerializeField, Range(0, 1)] float range = 1;
//方式
[SerializeField] WaveType waveType;
//Mesh及顶点
Mesh waveMesh;
Vector3[] baseVertex;
Vector3[] nowVertex;
void Start()
｛
waveMesh = GetComponent<MeshFilter>().mesh;
baseVertex = waveMesh.vertices;
nowVertex = new Vector3[baseVertex.Length];
｝
void Update()
｛
switch(waveType)
｛
case WaveType.simple:
WaveSimple();
break;
case WaveType.multiply:
WaveMultiply();
break;
default:
break;
｝
｝
void StartWave(WaveType type)
｛
waveType = type;
｝
void ResetWave()
｛
waveType = WaveType.none;
waveMesh.vertices = baseVertex;
｝
//-----
void WaveSimple()
｛
for (int i = 0; i < baseVertex.Length; i++)
｛
nowVertex[i] = baseVertex[i];
nowVertex[i].y += Mathf.Sin((Time.time * speed + nowVertex[i].x * xDirection + nowVertex[i].z * zDirection) * range) * height;
｝
waveMesh.vertices = nowVertex;
｝
void WaveMultiply()
｛
for (int i = 0; i < baseVertex.Length; i++)
｛
nowVertex[i] = baseVertex[i];
nowVertex[i].y += Mathf.Sin((Time.time * speed + baseVertex[i].x * xDirection) * range) * height + Mathf.Sin((Time.time * speed + baseVertex[i].z * zDirection) * range) * height;
｝
waveMesh.vertices = nowVertex;
｝
｝