Unity3d: Changing the mesh of Gameobject

1. Only regenerate new mesh, re-assign value

2. The generated mesh must be in accordance with official documents and specify: The index array of vertices and triangles, otherwise not.

A) Assign vertices
b) Assign triangles.

3. Example: Use code to generate a mesh for a specified size cube:

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GameObject createCube (Vector3 meshBoundSize){    GameObject go = GameObject.CreatePrimitive (PrimitiveType.Cube);    Mesh mesh = newMesh ();    floatx = meshBoundSize.x / 2;    floaty = meshBoundSize.y / 2;    floatz = meshBoundSize.z / 2;    mesh.vertices = newVector3[] {          newVector3 (-x, -y, -z),         newVector3 (x, -y, -z),         newVector3 (x, y, -z),         newVector3 (-x, y, -z),         newVector3 (-x, y, z),         newVector3 (x, y, z),         newVector3 (x, -y, z),         newVector3 (-x, -y, z),    };     //anticlockwise    mesh.triangles = newint[] {         3, 1, 0,         3, 2, 1,         2, 3, 4,         2, 4, 5,         7, 5, 4,         7, 6, 5,         0, 6, 7,         0, 1, 6,         3, 7, 4,         3, 0, 7,         1, 5, 6,         1, 2, 5     };     mesh.RecalculateNormals ();    mesh.RecalculateBounds ();    go.GetComponent<MeshFilter> ().mesh = mesh;    Material material = newMaterial (Shader.Find ("Transparent/Diffuse"));    Color color = Color.red;    color.a = 0.2f;    material.SetColor ("_Color", color);    MeshRenderer renderer = go.GetComponent<MeshRenderer> ();    renderer.sharedMaterial = material;    returngo;}

Unity3d: Changing the mesh of Gameobject