ぬの部屋(仮)
nu-no-he-ya
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  • C++でモデルを表示するためのコードをBlender Pythonから出力する。

    試験的なプログラムを書くだけでいちいちモデルを読み込むライブラリを使うのが面倒なので、Blender PythonでC++OpenGLのコードをprintする。まだやってなかったっけという感じなんだがやっていたら申し訳ない。

    import bpy
    import sys
    
    def as_cpp_array(outputto):
        obj = bpy.context.active_object
    
        mesh = obj.data
        
        pvecname = "points"   # 頂点データの配列の変数名
        vnvecname = "vnorms"  # 頂点法線の配列の変数名
        fvecname = "faces"    # 面データの配列の変数名
        fnvecname = "fnorms"  # 面法線の配列の変数名
    
        print("/////////////////////////////////////")
    
        if not pvecname is None:
            print("//std::vector<std::array<float, 3> > ",pvecname,";",file=outputto)
    
        if not vnvecname  is None:
            print("//std::vector<std::array<float, 3> > ",vnvecname,";",file=outputto)
    
        if not fvecname  is None:
            print("//std::vector<std::array<int, 3> > ",fvecname,";",file=outputto)
    
        if not fnvecname  is None:
            print("//std::vector<std::array<float, 3> > ",fnvecname,";",file=outputto)
        
        
        if not pvecname is None:
            for v in mesh.vertices:
                print(
                    pvecname +
                    ".push_back({",
                    v.co.x,",",
                    v.co.y,",",
                    v.co.z,
                    "});",
                    file=outputto
                    )
                    
        if not vnvecname is None:
            for v in mesh.vertices:
                print(
                    vnvecname +
                    ".push_back({",
                    v.normal.x,",",
                    v.normal.y,",",
                    v.normal.z,
                    "});",
                    file=outputto
                    )
    
    
    
        if not fvecname is None:
            for f in mesh.polygons:
                print(
                    fvecname + 
                    ".push_back({",
                    f.vertices[0],",",
                    f.vertices[1],",",
                    f.vertices[2],
                    "});",
                    file=outputto                
                    )
                    
        if not fnvecname is None:
            for f in mesh.polygons:
                print(
                    fnvecname +
                    ".push_back({",
                    f.normal.x,",",
                    f.normal.y,",",
                    f.normal.z,
                    "});",
                    file=outputto
                    )
                        
            
    
    as_cpp_array(sys.stdout)
    

    これをactive_objectに対して走らせると、例えば以下のような結果が得られる。

    /////////////////////////////////////
    //std::vector<std::array<float, 3> > points ;
    //std::vector<std::array<float, 3> > vnorms ;
    //std::vector<std::array<int, 3> > faces ;
    //std::vector<std::array<float, 3> > fnorms ;
    points.push_back({ 0.0 , 0.0 , -0.57135009765625 });
    points.push_back({ 0.4134289026260376 , -0.3003701865673065 , -0.25551632046699524 });
    points.push_back({ -0.15791259706020355 , -0.4860132336616516 , -0.25551632046699524 });
    points.push_back({ -0.5110297799110413 , 0.0 , -0.25551632046699524 });
    points.push_back({ -0.15791259706020355 , 0.4860132336616516 , -0.25551632046699524 });
    points.push_back({ 0.4134289026260376 , 0.3003701865673065 , -0.25551632046699524 });
    points.push_back({ 0.15791259706020355 , -0.4860132336616516 , 0.25551632046699524 });
    points.push_back({ -0.4134289026260376 , -0.3003701865673065 , 0.25551632046699524 });
    points.push_back({ -0.4134289026260376 , 0.3003701865673065 , 0.25551632046699524 });
    points.push_back({ 0.15791259706020355 , 0.4860132336616516 , 0.25551632046699524 });
    points.push_back({ 0.5110297799110413 , 0.0 , 0.25551632046699524 });
    points.push_back({ 0.0 , 0.0 , 0.57135009765625 });
    vnorms.push_back({ 0.0 , 0.0 , -1.0 });
    vnorms.push_back({ 0.7235938310623169 , -0.5257118344306946 , -0.44718772172927856 });
    vnorms.push_back({ -0.2763756215572357 , -0.8506424427032471 , -0.44718772172927856 });
    vnorms.push_back({ -0.8944059610366821 , 0.0 , -0.44718772172927856 });
    vnorms.push_back({ -0.2763756215572357 , 0.8506424427032471 , -0.44718772172927856 });
    vnorms.push_back({ 0.7235938310623169 , 0.5257118344306946 , -0.44718772172927856 });
    vnorms.push_back({ 0.2763756215572357 , -0.8506424427032471 , 0.44718772172927856 });
    vnorms.push_back({ -0.7235938310623169 , -0.5257118344306946 , 0.44718772172927856 });
    vnorms.push_back({ -0.7235938310623169 , 0.5257118344306946 , 0.44718772172927856 });
    vnorms.push_back({ 0.2763756215572357 , 0.8506424427032471 , 0.44718772172927856 });
    vnorms.push_back({ 0.8944059610366821 , 0.0 , 0.44718772172927856 });
    vnorms.push_back({ 0.0 , 0.0 , 1.0 });
    faces.push_back({ 0 , 1 , 2 });
    faces.push_back({ 1 , 0 , 5 });
    faces.push_back({ 0 , 2 , 3 });
    faces.push_back({ 0 , 3 , 4 });
    faces.push_back({ 0 , 4 , 5 });
    faces.push_back({ 1 , 5 , 10 });
    faces.push_back({ 2 , 1 , 6 });
    faces.push_back({ 3 , 2 , 7 });
    faces.push_back({ 4 , 3 , 8 });
    faces.push_back({ 5 , 4 , 9 });
    faces.push_back({ 1 , 10 , 6 });
    faces.push_back({ 2 , 6 , 7 });
    faces.push_back({ 3 , 7 , 8 });
    faces.push_back({ 4 , 8 , 9 });
    faces.push_back({ 5 , 9 , 10 });
    faces.push_back({ 6 , 10 , 11 });
    faces.push_back({ 7 , 6 , 11 });
    faces.push_back({ 8 , 7 , 11 });
    faces.push_back({ 9 , 8 , 11 });
    faces.push_back({ 10 , 9 , 11 });
    fnorms.push_back({ 0.18759654462337494 , -0.5773536562919617 , -0.7946510910987854 });
    fnorms.push_back({ 0.6070646643638611 , 0.0 , -0.7946524620056152 });
    fnorms.push_back({ -0.4911220967769623 , -0.35682904720306396 , -0.7946522235870361 });
    fnorms.push_back({ -0.4911220967769623 , 0.35682904720306396 , -0.7946522235870361 });
    fnorms.push_back({ 0.18759654462337494 , 0.5773536562919617 , -0.7946510910987854 });
    fnorms.push_back({ 0.9822461009025574 , 0.0 , -0.18759679794311523 });
    fnorms.push_back({ 0.3035355508327484 , -0.9341715574264526 , -0.1875891536474228 });
    fnorms.push_back({ -0.7946491241455078 , -0.5773593187332153 , -0.1875869631767273 });
    fnorms.push_back({ -0.7946491241455078 , 0.5773593187332153 , -0.1875869780778885 });
    fnorms.push_back({ 0.3035355508327484 , 0.9341715574264526 , -0.1875891238451004 });
    fnorms.push_back({ 0.7946491241455078 , -0.5773593187332153 , 0.1875869780778885 });
    fnorms.push_back({ -0.3035355508327484 , -0.9341715574264526 , 0.1875891238451004 });
    fnorms.push_back({ -0.9822461009025574 , 0.0 , 0.18759679794311523 });
    fnorms.push_back({ -0.3035355508327484 , 0.9341715574264526 , 0.1875891536474228 });
    fnorms.push_back({ 0.7946491241455078 , 0.5773593187332153 , 0.1875869631767273 });
    fnorms.push_back({ 0.4911220967769623 , -0.35682904720306396 , 0.7946522235870361 });
    fnorms.push_back({ -0.18759654462337494 , -0.5773536562919617 , 0.7946510910987854 });
    fnorms.push_back({ -0.6070646643638611 , 0.0 , 0.7946524620056152 });
    fnorms.push_back({ -0.18759654462337494 , 0.5773536562919617 , 0.7946510910987854 });
    fnorms.push_back({ 0.4911220967769623 , 0.35682904720306396 , 0.7946522235870361 });

    これをC++で書いたOpenGLの表示コードに貼り付ける。

    #include <iostream>
    #include <cstdlib>
    
    #include <Windows.h>
    #include <gl/GL.h>
    #include <gl/glfw/glfw3.h>
    
    #pragma comment(lib,"opengl32.lib")
    #pragma comment(lib,"glfw3.lib")
    
    #include <gl/GLU.h>
    #pragma comment(lib,"glu32.lib")
    
    #include<vector>
    #include<array>
    
    
    struct d3item {
      std::vector<std::array<float, 3> >  points;
      std::vector<std::array<float, 3> >  vnorms;
      std::vector<std::array<int, 3> >  faces;
      std::vector<std::array<float, 3> >  fnorms;
    
    public:
      void init() {
    
        points.push_back({ 0.0 , 0.0 , -0.57135009765625 });
        points.push_back({ 0.4134289026260376 , -0.3003701865673065 , -0.25551632046699524 });
        points.push_back({ -0.15791259706020355 , -0.4860132336616516 , -0.25551632046699524 });
        points.push_back({ -0.5110297799110413 , 0.0 , -0.25551632046699524 });
        points.push_back({ -0.15791259706020355 , 0.4860132336616516 , -0.25551632046699524 });
        points.push_back({ 0.4134289026260376 , 0.3003701865673065 , -0.25551632046699524 });
        points.push_back({ 0.15791259706020355 , -0.4860132336616516 , 0.25551632046699524 });
        points.push_back({ -0.4134289026260376 , -0.3003701865673065 , 0.25551632046699524 });
        points.push_back({ -0.4134289026260376 , 0.3003701865673065 , 0.25551632046699524 });
        points.push_back({ 0.15791259706020355 , 0.4860132336616516 , 0.25551632046699524 });
        points.push_back({ 0.5110297799110413 , 0.0 , 0.25551632046699524 });
        points.push_back({ 0.0 , 0.0 , 0.57135009765625 });
        vnorms.push_back({ 0.0 , 0.0 , -1.0 });
        vnorms.push_back({ 0.7235938310623169 , -0.5257118344306946 , -0.44718772172927856 });
        vnorms.push_back({ -0.2763756215572357 , -0.8506424427032471 , -0.44718772172927856 });
        vnorms.push_back({ -0.8944059610366821 , 0.0 , -0.44718772172927856 });
        vnorms.push_back({ -0.2763756215572357 , 0.8506424427032471 , -0.44718772172927856 });
        vnorms.push_back({ 0.7235938310623169 , 0.5257118344306946 , -0.44718772172927856 });
        vnorms.push_back({ 0.2763756215572357 , -0.8506424427032471 , 0.44718772172927856 });
        vnorms.push_back({ -0.7235938310623169 , -0.5257118344306946 , 0.44718772172927856 });
        vnorms.push_back({ -0.7235938310623169 , 0.5257118344306946 , 0.44718772172927856 });
        vnorms.push_back({ 0.2763756215572357 , 0.8506424427032471 , 0.44718772172927856 });
        vnorms.push_back({ 0.8944059610366821 , 0.0 , 0.44718772172927856 });
        vnorms.push_back({ 0.0 , 0.0 , 1.0 });
        faces.push_back({ 0 , 1 , 2 });
        faces.push_back({ 1 , 0 , 5 });
        faces.push_back({ 0 , 2 , 3 });
        faces.push_back({ 0 , 3 , 4 });
        faces.push_back({ 0 , 4 , 5 });
        faces.push_back({ 1 , 5 , 10 });
        faces.push_back({ 2 , 1 , 6 });
        faces.push_back({ 3 , 2 , 7 });
        faces.push_back({ 4 , 3 , 8 });
        faces.push_back({ 5 , 4 , 9 });
        faces.push_back({ 1 , 10 , 6 });
        faces.push_back({ 2 , 6 , 7 });
        faces.push_back({ 3 , 7 , 8 });
        faces.push_back({ 4 , 8 , 9 });
        faces.push_back({ 5 , 9 , 10 });
        faces.push_back({ 6 , 10 , 11 });
        faces.push_back({ 7 , 6 , 11 });
        faces.push_back({ 8 , 7 , 11 });
        faces.push_back({ 9 , 8 , 11 });
        faces.push_back({ 10 , 9 , 11 });
        fnorms.push_back({ 0.18759654462337494 , -0.5773536562919617 , -0.7946510910987854 });
        fnorms.push_back({ 0.6070646643638611 , 0.0 , -0.7946524620056152 });
        fnorms.push_back({ -0.4911220967769623 , -0.35682904720306396 , -0.7946522235870361 });
        fnorms.push_back({ -0.4911220967769623 , 0.35682904720306396 , -0.7946522235870361 });
        fnorms.push_back({ 0.18759654462337494 , 0.5773536562919617 , -0.7946510910987854 });
        fnorms.push_back({ 0.9822461009025574 , 0.0 , -0.18759679794311523 });
        fnorms.push_back({ 0.3035355508327484 , -0.9341715574264526 , -0.1875891536474228 });
        fnorms.push_back({ -0.7946491241455078 , -0.5773593187332153 , -0.1875869631767273 });
        fnorms.push_back({ -0.7946491241455078 , 0.5773593187332153 , -0.1875869780778885 });
        fnorms.push_back({ 0.3035355508327484 , 0.9341715574264526 , -0.1875891238451004 });
        fnorms.push_back({ 0.7946491241455078 , -0.5773593187332153 , 0.1875869780778885 });
        fnorms.push_back({ -0.3035355508327484 , -0.9341715574264526 , 0.1875891238451004 });
        fnorms.push_back({ -0.9822461009025574 , 0.0 , 0.18759679794311523 });
        fnorms.push_back({ -0.3035355508327484 , 0.9341715574264526 , 0.1875891536474228 });
        fnorms.push_back({ 0.7946491241455078 , 0.5773593187332153 , 0.1875869631767273 });
        fnorms.push_back({ 0.4911220967769623 , -0.35682904720306396 , 0.7946522235870361 });
        fnorms.push_back({ -0.18759654462337494 , -0.5773536562919617 , 0.7946510910987854 });
        fnorms.push_back({ -0.6070646643638611 , 0.0 , 0.7946524620056152 });
        fnorms.push_back({ -0.18759654462337494 , 0.5773536562919617 , 0.7946510910987854 });
        fnorms.push_back({ 0.4911220967769623 , 0.35682904720306396 , 0.7946522235870361 });
      }
      void draw() {
    
        auto color = std::array<float, 4>{1.0, 0, 0, 1};
        glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, color.data());
        glColor3d(1, 1, 1);
        glBegin(GL_TRIANGLES);
        for (size_t f = 0; f < faces.size(); f++) {
          
          //面法線
          glNormal3fv(fnorms[f].data());
    
          size_t p0 = faces[f][0];
          size_t p1 = faces[f][1];
          size_t p2 = faces[f][2];
    
          //頂点法線
          //glNormal3fv(vnorms[p0].data());
          glVertex3fv(points[p0].data());
    
          //頂点法線
          //glNormal3fv(vnorms[p1].data());
          glVertex3fv(points[p1].data());
    
          //頂点法線
          //glNormal3fv(vnorms[p2].data());
          glVertex3fv(points[p2].data());
        }
        glEnd();
    
      }
    };
    int main()
    {
      ////////////////////////////////////////////////////////////////////////////////
      // GLFW の初期化
      if (glfwInit() == GL_FALSE) {
        // 初期化に失敗したら終了
        return 1;
      }
    
      ////////////////////////////////////////////////////////////////////////////////
      // ウィンドウを作成
      GLFWwindow* window = glfwCreateWindow(
        400,           //width
        400,           //height
        "window title",//title 
        NULL,          //monitor
        NULL           //share
      );
    
      ////////////////////////////////////////////////////////////////////////////////
      // ウィンドウを作成できなければ終了
      if (window == nullptr) {
        glfwTerminate();
        return 1;
      }
    
      d3item item;
      item.init();
    
      glfwMakeContextCurrent(window);
    
      while (glfwWindowShouldClose(window) == GL_FALSE) {
    
        int width, height;
        glfwGetFramebufferSize(window, &width, &height);
    
        const GLfloat lightPos[] = { -3 , 0 , 0 , 1 };
        const GLfloat lightCol[] = { 1 , 1 , 1 , 1 };
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glLightfv(GL_LIGHT0, GL_DIFFUSE, lightCol);
        glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
    
        glEnable(GL_DEPTH_TEST);
    
        glClearColor(0, 0, 0, 1);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        /////////////////////
        // 描画
        glViewport(0, 0, width, height);
    
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        gluPerspective(45, width / (double)height, 0.01, 10);
        {
          glMatrixMode(GL_MODELVIEW);
          glPushMatrix();
          glLoadIdentity();
    
          static int angle = 0;
    
          glTranslated(0, 0, -2);
          glRotated(angle++, 1, 1, 1);
    
          item.draw();
    
          glPopMatrix();
        }
        glMatrixMode(GL_PROJECTION);
        glPopMatrix();
    
        //
        /////////////////////
    
        //glFlush();
    
        glfwSwapBuffers(window);
    
    
        // イベント取得
        glfwWaitEvents();
    
      }
    
      glfwTerminate();
    
    }