Qt--OpenGL加载OBJ 3D模型

比眉伴天荒 2023-02-16 06:59 61阅读 0赞

原始出处：https://github.com/kadie16/3D-Model-Viewer

效果图：

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70]原始代码是基于MAC的在windows上面没法用：  
需要稍微修改一下：  
.pro文件添加

#-------------------------------------------------
    #
    # Project created by QtCreator 2020-06-09T11:42:35
    #
    #-------------------------------------------------
    
    QT       += core gui opengl
    
    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
    
    TARGET = OpenglOBJ
    TEMPLATE = app
    
    # The following define makes your compiler emit warnings if you use
    # any feature of Qt which has been marked as deprecated (the exact warnings
    # depend on your compiler). Please consult the documentation of the
    # deprecated API in order to know how to port your code away from it.
    DEFINES += QT_DEPRECATED_WARNINGS
    
    # You can also make your code fail to compile if you use deprecated APIs.
    # In order to do so, uncomment the following line.
    # You can also select to disable deprecated APIs only up to a certain version of Qt.
    #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
    
    CONFIG += c++11
    
    SOURCES += \
            main.cpp \
            mainwindow.cpp \
        camera.cpp \
        objload.cpp \
        face.cpp \
        vertex.cpp \
        glwidget.cpp
    
    HEADERS += \
            mainwindow.h \
        camera.h \
        objload.h \
        face.h \
        vertex.h \
        glwidget.h
    
    FORMS += \
            mainwindow.ui
    
    LIBS += -lOpengl32
    
    # Default rules for deployment.
    qnx: target.path = /tmp/$${ TARGET}/bin
    else: unix:!android: target.path = /opt/$${ TARGET}/bin
    !isEmpty(target.path): INSTALLS += target

还有就是glwidget.h文件需要修改：

#ifndef GLWIDGET_H
    #define GLWIDGET_H
    #include <QWidget>
    #include <QGLWidget>
    #include <QT>
    #include <QTimer>
    #include <QVector2D>
    #include <QMouseEvent>
    #include <QEvent>
    #include <QDebug>
    #include "objload.h"
    #include "vertex.h"
    #include "face.h"
    #include "camera.h"
    #include <QQuaternion>
    #include <QObject>
    #include <QMatrix4x4>
    #include <QOpenGLWidget>
    #include <QOpenGLFunctions>
    #include <QGLFramebufferObjectFormat>
    
    class GLWidget : public QGLWidget
    { 
        Q_OBJECT
    public:
        explicit GLWidget(QWidget *parent = nullptr);
        bool toggleRotation();
        bool toggleCulling();
        bool toggleTranslation();
        double increaseScale();
        double decreaseScale();
        void setScale();
        void initializeGL();
        void paintGL();
        void drawObject();
        void drawAxes();
        void resetView();
        void grabObj(objLoad objFile);
        void grabColor(double r, double g, double b);
        void resizeGL(int w, int h);
        void mouseMoveEvent(QMouseEvent *e);
        QQuaternion drag2Rotate(float dx, float dy);
        void drag2Translate(float dx, float dy);
        void drag2Zoom(float dy);
    
    private:
        QTimer timer;
        /* .obj Information */
        objLoad *objPtr = 0;
        std::vector<Vertex> vertices;
        std::vector<face> faces;
        std::vector<float> center;
        std::vector<float> maxCoords;
        std::vector<float> minCoords;
        QQuaternion currQ;
        /* Frustrum Things */
        float radius;
        float fdist;
        double dNear;
        double dFar;
        double viewAngle;
        float w0;
        float h0;
        /* User Control */
        camera cam;
        /* Rotation */
        bool mouseHeld;
        bool rotationOK;
        /* Culling */
        bool cullingOK;
        bool translateOK;
        bool scaleOK;
        /* Zoom */
        bool zoomOK;
        float zoomF;
        double scale;
        /* Color Pick */
        double red,green,blue;
        bool needsReset;
        QVector3D axisOfRotation;
        int x,y,dx,dy,x0,y0;
        int prevPos[2];
        float mag;
    signals:
        void Mouse_Pressed();
        void Mouse_Pos();
        void Mouse_Released();
    protected:
        void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
        void mouseReleaseEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
    
    };
    
    #endif // GLWIDGET_H

其他不变，编译没有问题。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200609132325182.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzI4ODc3MTI1,size_16,color_FFFFFF,t_70