一張圖片，通過滑鼠點選產生水波紋理，shader比較簡單，演算法主要在C#那邊，多執行緒優化計算

用下面shader建立一個材質，建立一個面片或Cube並掛上下面C#指令碼，設定圖片畫素，預設是256*256，賦值材質圖片紋理，執行，點選滑鼠即可看到效果

shader

Shader "Zon/WaveTexture" {
	Properties {
		_MainTex ("水波紋理", 2D) = "" {}
	}
	SubShader {
		pass{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

			sampler2D _MainTex;
			sampler2D _WaveTex;

			struct v2f {
					float4 pos:POSITION;
					float2 uv:TEXCOORD0;
			};

			v2f vert(appdata_full v)
			{
				v2f o;
				o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
				o.uv = v.texcoord.xy;
				return o;
			}

			fixed4 frag (v2f IN) : COLOR
			{
				float2 uv = tex2D(_WaveTex, IN.uv).xy;
				uv = uv * 2 - 1; //把0~1轉成-1~1
				uv *= 0.025;

				IN.uv += uv;

				fixed4 color = tex2D(_MainTex, IN.uv);

				return color;
			}
			ENDCG
		}
	}
}
 

using UnityEngine;
using System.Collections;
using System.Threading;

public class WaveTexture : MonoBehaviour {
	public int waveWidth;
	public int waveHeight;

	float[,] waveA;
	float[,] waveB;
	Color[] colorBuffer;

	Texture2D tex_uv;

	bool isRun = true;
	int sleepTime;

	// Use this for initialization
	void Start () {
		waveA = new float[waveWidth, waveHeight];
		waveB = new float[waveWidth, waveHeight];
		colorBuffer = new Color[waveWidth * waveHeight];
		tex_uv = new Texture2D (waveWidth, waveHeight);

		GetComponent<Renderer> ().material.SetTexture ("_WaveTex", tex_uv);

		Thread th = new Thread (new ThreadStart(ComputeWave));
		th.Start ();
		//Putpop ();
		//PutDrop(64,64);
	}
	
	// Update is called once per frame
	void Update () {
		sleepTime = (int)(Time.deltaTime * 1000);
		tex_uv.SetPixels (colorBuffer);
		tex_uv.Apply ();

		if (Input.GetMouseButton(0)) {
			RaycastHit hit;
			Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
			if (Physics.Raycast (ray, out hit)) {
				Vector3 pos = transform.worldToLocalMatrix.MultiplyPoint(hit.point);//把世界座標轉換成圖片畫素座標
				//Debug.Log(pos);//pos = -0.5 ~ 0.5
				int w = (int)((pos.x + 0.5) * waveWidth);
				int h = (int)((pos.y + 0.5) * waveHeight);
				PutDrop (w, h);
			}
		}
		//ComputeWave ();
	}

	void Putpop()
	{
		//能量置1
		waveA [waveWidth / 2, waveHeight / 2] = 1;//中間點
		waveA [waveWidth / 2 - 1, waveHeight / 2] = 1;//左
		waveA [waveWidth / 2 + 1, waveHeight / 2] = 1;//右
		waveA [waveWidth / 2, waveHeight / 2 - 1] = 1;//下
		waveA [waveWidth / 2, waveHeight / 2 + 1] = 1;//上
		waveA [waveWidth / 2 - 1, waveHeight / 2 - 1] = 1;//左下
		waveA [waveWidth / 2 - 1, waveHeight / 2 + 1] = 1;//左上
		waveA [waveWidth / 2 + 1, waveHeight / 2 - 1] = 1;//右下
		waveA [waveWidth / 2 + 1, waveHeight / 2 + 1] = 1;//右上
	}

	void PutDrop(int x, int y)
	{
		int radius = 20;
		float dist;

		for (int i = -radius; i <= radius; i++) {
			for (int j = -radius; j <= radius; j++) {
				if (((x + i >= 0) && (x + i < waveWidth - 1)) && ((y + j >= 0) && (y + j < waveHeight - 1))) {
					dist = Mathf.Sqrt (i * i + j * j);
					if (dist < radius)
						waveA [x + i, y + j] = Mathf.Cos (dist * Mathf.PI / radius);
				}
			}
		}
	}

	void ComputeWave()
	{
		while (isRun) {
			for (int w = 1; w < waveWidth - 1; w++) {
				for (int h = 1; h < waveHeight - 1; h++) {
					//8個方向計算
					waveB [w, h] = (waveA [w - 1, h] +
						waveA [w + 1, h] +
						waveA [w, h - 1] +
						waveA [w, h + 1] +
						waveA [w - 1, h - 1] +
						waveA [w + 1, h - 1] +
						waveA [w - 1, h + 1] +
						waveA [w + 1, h + 1]) / 4 - waveB [w, h];

					//能量限制
					float value = waveB [w, h];
					if (value > 1)
						waveB [w, h] = 1;
					if (value < -1)
						waveB [w, h] = -1;

					float offset_u = (waveB [w - 1, h] - waveB [w + 1, h]) / 2;
					float offset_v = (waveB [w, h - 1] - waveB [w, h + 1]) / 2;

					float r = offset_u / 2 + 0.5f;
					float g = offset_v / 2 + 0.5f;

					//tex_uv.SetPixel (w, h, new Color (r, g, 0));

					colorBuffer [w + waveWidth * h] = new Color (r, g, 0);

					waveB [w, h] -= waveB [w, h] * 0.0025f;//能量衰減計算

				}
			}

			//tex_uv.Apply ();

			float[,] temp = waveA;
			waveA = waveB;
			waveB = temp;

			Thread.Sleep (sleepTime);
		}
	}

	void OnDestroy()
	{
		isRun = false;
	}
}