c#或者 C++ 读取 ply文件代码

以下是C++读取PLY文件的示例代码：

#include <iostream>
#include <fstream>
#include <vector>
#include <sstream>

struct Vertex {
    float x, y, z;
    float nx, ny, nz;
    unsigned char r, g, b;
};

bool readPLY(const std::string& filename, std::vector<Vertex>& vertices) {
    std::ifstream file(filename);
    if (!file.is_open()) {
        std::cout << "Failed to open file: " << filename << std::endl;
        return false;
    }

    std::string line;
    std::getline(file, line); // Read the first line

    // Read header
    int numVertices = 0;
    while (line.find("end_header") == std::string::npos) {
        std::getline(file, line);

        if (line.find("element vertex") != std::string::npos) {
            std::istringstream iss(line);
            std::string element, vertex;
            int count;

            iss >> element >> vertex >> count;
            numVertices = count;
        }
    }

    // Read vertices
    vertices.resize(numVertices);
    for (int i = 0; i < numVertices; ++i) {
        file >> vertices[i].x >> vertices[i].y >> vertices[i].z
             >> vertices[i].nx >> vertices[i].ny >> vertices[i].nz
             >> vertices[i].r >> vertices[i].g >> vertices[i].b;
    }

    file.close();
    return true;
}

int main() {
    std::string filename = "example.ply";
    std::vector<Vertex> vertices;

    if (readPLY(filename, vertices)) {
        // Process the vertices
        for (const auto& vertex : vertices) {
            // Do something with vertex data
            std::cout << "Vertex: (" << vertex.x << ", " << vertex.y << ", " << vertex.z << ")" << std::endl;
        }
    }

    return 0;
}

您可以将上述代码保存为.cpp文件，并将PLY文件的路径更改为您要读取的实际文件路径。代码将打开PLY文件，读取顶点数据并将其存储在Vertex结构的vector中。然后，您可以根据需要处理顶点数据。

对于C#，您可以使用类似的逻辑来读取PLY文件，但是代码会有所不同。以下是C#读取PLY文件的示例代码：

using System;
using System.IO;
using System.Collections.Generic;

struct Vertex {
    public float x, y, z;
    public float nx, ny, nz;
    public byte r, g, b;
}

class Program {
    static bool ReadPLY(string filename, out List<Vertex> vertices) {
        vertices = new List<Vertex>();

        using (StreamReader file = new StreamReader(filename)) {
            string line = file.ReadLine(); // Read the first line

            // Read header
            int numVertices = 0;
            while (!line.Contains("end_header")) {
                line = file.ReadLine();

                if (line.Contains("element vertex")) {
                    string[] words = line.Split(' ');
                    numVertices = int.Parse(words[2]);
                }
            }

            // Read vertices
            for (int i = 0; i < numVertices; ++i) {
                line = file.ReadLine();
                string[] words = line.Split(' ');

                Vertex vertex = new Vertex();
                vertex.x = float.Parse(words[0]);
                vertex.y = float.Parse(words[1]);
                vertex.z = float.Parse(words[2]);
                vertex.nx = float.Parse(words[3]);
                vertex.ny = float.Parse(words[4]);
                vertex.nz = float.Parse(words[5]);
                vertex.r = byte.Parse(words[6]);
                vertex.g = byte.Parse(words[7]);
                vertex.b = byte.Parse(words[8]);

                vertices.Add(vertex);
            }
        }

        return true;
    }

    static void Main(string[] args) {
        string filename = "example.ply";
        List<Vertex> vertices;

        if (ReadPLY(filename, out vertices)) {
            // Process the vertices
            foreach (var vertex in vertices) {
                // Do something with vertex data
                Console.WriteLine($"Vertex: ({vertex.x}, {vertex.y}, {vertex.z})");
            }
        }
    }
}

与C++代码类似，将上述代码保存为.cs文件，并将PLY文件的路径更改为您要读取的实际文件路径。代码将打开PLY文件，读取顶点数据并将其存储在Vertex结构的List中。然后，您可以根据需要处理顶点数据。

希望这些代码对您有所帮助！