1.只能重新生成新的mesh，重新赋值
2.生成的mesh，必须按照官网文档，同时指定：顶点与三角形的index数组，否则不行的
a) assign vertices
b) assign triangles.
3.例子：用代码生成mesh为指定size的cube：
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GameObject createCube (Vector3 meshBoundSize){ GameObject go = GameObject.CreatePrimitive (PrimitiveType.Cube); Mesh mesh = new Mesh (); float x = meshBoundSize.x / 2; float y = meshBoundSize.y / 2; float z = meshBoundSize.z / 2; mesh.vertices = new Vector3[] { new Vector3 (-x, -y, -z), new Vector3 (x, -y, -z), new Vector3 (x, y, -z), new Vector3 (-x, y, -z), new Vector3 (-x, y, z), new Vector3 (x, y, z), new Vector3 (x, -y, z), new Vector3 (-x, -y, z), }; //anticlockwise mesh.triangles = new int[] { 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 = new Material (Shader.Find ("Transparent/Diffuse")); Color color = Color.red; color.a = 0.2f; material.SetColor ("_Color", color); MeshRenderer renderer = go.GetComponent<MeshRenderer> (); renderer.sharedMaterial = material; return go;} |