使用MATLAB读取.ply点云图
filename = 'C:\\Users\\13163\\Desktop\\3D_PointCloud\\PointCloud_2\\3D点云生成\\Group_1\\outputMesh.ply';
[vertices, faces, color] = readPly(filename);
plotPly(vertices, faces, color);
function [vertices, faces, color] = readPly(filename)% 打开文件fid = fopen(filename, 'r');if fid == -1error('Cannot open PLY file.');end% 跳过头部信息，读取直到遇到顶点数据line = fgets(fid);while trueline = fgets(fid);if contains(line, 'end_header')break;endend% 读取顶点数量line = fgets(fid);tokens = strsplit(line);numVertices = str2double(tokens{2});% 读取面片数量（可选）line = fgets(fid);tokens = strsplit(line);numFaces = str2double(tokens{2});% 读取顶点数据vertices = zeros(numVertices, 3);color = zeros(numVertices, 3); % 如果 PLY 文件中包含颜色信息for i = 1:numVerticesline = fgets(fid);tokens = strsplit(strtrim(line));vertices(i, :) = str2double(tokens(1:3));if length(tokens) >= 6color(i, :) = str2double(tokens(4:6)); % 如果文件有颜色信息endend% 读取面片数据faces = zeros(numFaces, 3);for i = 1:numFacesline = fgets(fid);tokens = strsplit(strtrim(line));faces(i, :) = str2double(tokens(2:end));end% 关闭文件fclose(fid);
endfunction plotPly(vertices, faces, color)% 绘制点云figure;hold on;scatter3(vertices(:, 1), vertices(:, 2), vertices(:, 3), 10, color, 'filled');% 绘制面片if ~isempty(faces)trimesh(faces, vertices(:, 1), vertices(:, 2), vertices(:, 3), 'FaceColor', 'cyan', 'FaceAlpha', 0.3);endaxis equal;xlabel('X');ylabel('Y');zlabel('Z');title('3D Point Cloud and Mesh');grid on;hold off;
end
报错
错误使用 fopen 找不到文件
filename = ‘“C:\Users\13163\Desktop\3D_PointCloud\PointCloud_2\3D点云生成\Group_1\outputMesh.ply”’; % 替换为你的 PLY 文件路径
[vertices, faces, color] = readPly(filename);
plotPly(vertices, faces, color);错误使用 fopen
找不到文件。确保文件存在且路径有效。
出错 untitled9>readPly (第 6 行)
fid = fopen(filename, ‘r’);
原因：Windows 路径分隔符是反斜杠 \，但在字符串中需要使用双反斜杠 \，或者使用正斜杠 /，因为 MATLAB 中反斜杠 \ 用作转义字符。
filename = 'C:\Users\13163\Desktop\3D_PointCloud\PointCloud_2\3D点云生成\Group_1\outputMesh.ply';
改成\即可。
filename = 'C:\\Users\\13163\\Desktop\\3D_PointCloud\\PointCloud_2\\3D点云生成\\Group_1\\outputMesh.ply';
无法运行，运行按钮变灰
第一次使用实时脚本，注意函数一定写在主函数后面，否则无法运行
读取ply文件
% 定义文件路径
filename = "C:\\Users\\13163\\Desktop\\3D_PointCloud\\PointCloud_2\\3D点云生成\\Group_1\\outputMesh.ply"; % 替换为你自己的文件路径% 读取 PLY 点云文件
ptCloud = pcread(filename);% 显示点云
pcshow(ptCloud);
title('3D Point Cloud Visualization');
