如何获得重新着色的网格百分比？

Question

我正在尝试根据对象的三角形和顶点进行绘画。我已经完成了这些，但我想立即显示玩家/用户绘制了多少对象。因此，当达到一定的速度时，我就会结束游戏。但我不知道如何获得百分比。

预先感谢您的帮助

https://i.sstatic.net/mrXKt.jpg

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class VertexPainterSec : MonoBehaviour
{
    [SerializeField] private MeshRenderer meshRenderer;
    [SerializeField] private Mesh mesh;
    [SerializeField] Vector3[] vertices;
    [SerializeField] Color[] colorArray;
    [SerializeField] public Text colorPercentage;

    private void Start()
    {
        mesh = transform.GetComponent<MeshFilter>().mesh;
        vertices = mesh.vertices;

        colorArray = new Color[vertices.Length];
        for (int k = 0; k < vertices.Length; k++)
        {
            colorArray[k] = Color.white;
        }
        mesh.colors = colorArray;
    }

    void Update()
    {
        if (Input.GetMouseButton(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if (Physics.Raycast(ray, out RaycastHit hit))
            {            

                int[] triangles = mesh.triangles;
                var vertIndex1 = triangles[hit.triangleIndex * 3 + 0];
                var vertIndex2 = triangles[hit.triangleIndex * 3 + 1];
                var vertIndex3 = triangles[hit.triangleIndex * 3 + 2];

                colorArray[vertIndex1] = Color.red;
                colorArray[vertIndex2] = Color.red;
                colorArray[vertIndex3] = Color.red;

                mesh.colors = colorArray;
                colorPercentage.text = "Color Percantage";
            }
            else
            {
                Debug.Log("no hit");
            }
        }
    }
} 

Answer 1

您可以做到这两种方法：

第一个是运行一个函数来计算colorArray中的非白色颜色总数，因此

void CalculatePercentage()
        {
            int totalPainted = 0;
            foreach (var c in colorArray)
            {
                if (c != Color.White)
                {
                    totalPainted++;
                }
            }
            colorPercentage = "Color Percantage: %" + (totalPainted / colorArray) * 100;            
        }

它具有一些缺陷，因为它非常效率，因为您正在计数每一个缺点每次运行此阵列中的项目，只有在您的基本颜色为白色的情况下，

第二种方法涉及跟踪您绘制了多少个顶点，您必须稍微修改代码像这样：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class VertexPainterSec : MonoBehaviour
{
    [SerializeField]
    private MeshRenderer meshRenderer;
    [SerializeField]
    private Mesh mesh;
    [SerializeField]
    Vector3[] vertices;
    [SerializeField]
    Color[] colorArray;
    [SerializeField]
    public Text colorPercentage;
    //This value will track how many vertices you've painted
    [SerializeField]
    private int paintedVertices;
    private void Start()
    {
        //Initialize the value
        paintedVertices = 0;
        mesh = transform.GetComponent<MeshFilter>().mesh;
        vertices = mesh.vertices;
        colorArray = new Color[vertices.Length];
        for (int k = 0; k < vertices.Length; k++)
        {
            colorArray[k] = Color.white;
        }

        mesh.colors = colorArray;
    }

    void Update()
    {
        if (Input.GetMouseButton(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            if (Physics.Raycast(ray, out RaycastHit hit))
            {
                int[] triangles = mesh.triangles;
                var vertIndex1 = triangles[hit.triangleIndex * 3 + 0];
                var vertIndex2 = triangles[hit.triangleIndex * 3 + 1];
                var vertIndex3 = triangles[hit.triangleIndex * 3 + 2];
                //Only paint and add to paintedVertices if the color is white
                //to avoid constantly adding to the paintedVertices value
                if (colorArray[vertIndex1] == Color.white)
                {
                    colorArray[vertIndex1] = Color.red;
                    paintedVertices++;
                }

                if (colorArray[vertIndex2] == Color.white)
                {
                    colorArray[vertIndex2] = Color.red;
                    paintedVertices++;
                }

                if (colorArray[vertIndex3] == Color.white)
                {
                    colorArray[vertIndex3] = Color.red;
                    paintedVertices++;
                }

                mesh.colors = colorArray;
                //Calculate the percentage by dividing the
                //paintedVertices value by the total number of vertices
                colorPercentage.text = "Color Percantage: %" + (paintedVertices / colorArray.Length) * 100;
            }
            else
            {
                Debug.Log("no hit");
            }
        }
    }
}