原本想使用插件来做，奈何囊中羞涩，只能自己写了。通过Value值修改高度。效果图：

image

代码：

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

public class cube : MonoBehaviour
{
    private Vector3[] vertices;
    private Mesh mesh;
    [Range(0, 10)]
    public float value = 1;//设置高度值
    // Use this for initialization
    void Start()
    {
        vertices = GetComponent<MeshFilter>().mesh.vertices;//获取Gameobject meshfilter组件
        mesh = GetComponent<MeshFilter>().mesh;//获取meshfilter组件中mesh数组数据
    }

    // Update is called once per frame
    void Update()
    {
        for (int i = 0; i < vertices.Length; i++)//遍历数组
        {

            if (vertices[i].y >= 0f)//判断mesh是否为顶部
            {
                vertices[i].y = value;//设置mesh顶部高度等于高度值
            }
        }
        mesh.vertices = vertices;//刷新
    }
}

项目地址：https://github.com/baishuisr1/Unity-3D-Chart