unity代码创建草和模拟风的效果

void Start()

{

Test4();

}

//草

private Vector3[] grassArray = new Vector3[7];

private GameObject grassobj;

void Test4()

{

GameObject obj = new GameObject();

obj.name = "grass";

grassobj = obj;

MeshFilter meshFilter = obj.AddComponent();

//mesh的顶点，按照图的我们顺时针写就行

Vector3[] newVertices =

{

new Vector3(0, 0, 0), new Vector3(0 ,1 ,0) , new Vector3(0, 2, 0), new Vector3(0, 3, 0),

new Vector3(0.3f, 2 ,0 ), new Vector3(0.6f, 1 , 0), new Vector3(0.9f, 0 ,0)

};

grassArray = newVertices;

//uV坐标，照抄上面的，去除z

Vector2[] newUV =

{

new Vector2(0, 0), new Vector2(0, 1), new Vector2(0, 2), new Vector2(0, 3),

new Vector2(0.3f, 2), new Vector2(0.6f, 1), new Vector2(0.9f,0)

};

int[] newTriangles =

{

2,3,4,1,2,4,1,4,5,0,1,5,0,5,6,//顺时针渲染正面

2,4,3,1,4,2,1,5,4,0,5,1,0,6,5//逆时针渲染背面

};

Mesh mesh = new Mesh();

meshFilter.mesh = mesh;

//顶点 三角面 uv

mesh.vertices = grassArray;

mesh.uv = newUV;

mesh.triangles = newTriangles;

//渲染

MeshRenderer renderer = obj.AddComponent();

Material mat = new Material (Shader.Find("Standard"));

mat.color = Color.green;

renderer.material = mat;

}

public float wind;

Vector3[] baseVertices =

{

new Vector3(0, 0, 0), new Vector3(0 ,1 ,0) , new Vector3(0, 2, 0), new Vector3(0, 3, 0),

new Vector3(0.3f, 2 ,0 ), new Vector3(0.6f, 1 , 0), new Vector3(0.9f, 0 ,0)

};

// Update is called once per frame

void Update()

{

//模拟草被风影响

//顶点高度越高的草越容易被影响

wind = Mathf.Sin(Time.time);//sin波

for (int i = 0; i < grassArray.Length; i++)

{

if (grassArray[i].y == 3)

{

//高度为3的草

grassArray[i].x = baseVertices[i].x + (wind * baseVertices[i].y * 0.2f);

}

else if (grassArray[i].y == 2)

{

//高度为2的草

grassArray[i].x = baseVertices[i].x + (wind * baseVertices[i].y * 0.15f);

}

else if (grassArray[i].y == 1)

{

//高度为1的草

grassArray[i].x = baseVertices[i].x + (wind * baseVertices[i].y * 0.1f);

}

}

grassobj.GetComponent().mesh.vertices = grassArray;

}

通过代码创建的草的mesh

y轴单位是1

0到6的距离是0.9

一棵草左右摇摆

写法比较粗糙，后面再研究下更好的写法

好文链接