如何在OpenGL中显示/绘制.ply对象？

Question

我试图让OpenGL画出我正在加载的图形OPENFILENAME。我现在所拥有的是：我可以显示评论，顶点，多少面孔等，但是我无法画出图形，我不知道该怎么做。我可以画出其他预定的数字，但不是我想要打开的数字。

---

这就是我的一切初始化：

case WM_CREATE: 
    hDC = GetDC(hWnd); 
     hRC=wglCreateContext(hDC); 
     wglMakeCurrent(hDC,hRC); 
     g_hwndDlg = CreateDialog(hInst,MAKEINTRESOURCE(IDD_DIALOG1),hWnd,DialogProc); 
     Figure = new DrawFigure(); 
     initGL(); 
     break; 

这是我找出我开的元素有：

/* go through each kind of element that we learned is in the file */ 
    /* and read them */ 

    for (i = 0; i < nelems; i++) { 
    /* get the description of the first element */ 
    elem_name = elist[i]; 
    plist = ply_get_element_description (ply, elem_name, &num_elems, &nprops); 
    int el=sprintf(szFile,"element %s %d\n", elem_name, num_elems); 
    /* print the name of the element, for debugging */ 
     TextOut(hDC,150,0+i*20,szFile,el); 
    /* if we're on vertex elements, read them in */ 
    if (equal_strings ("vertex", elem_name)) { 
     /* create a vertex list to hold all the vertices */ 
     vlist = (Vertex **) malloc (sizeof (Vertex *) * num_elems); 
     /* set up for getting vertex elements */ 
     ply_get_property (ply, elem_name, &vert_props[0]); 
     ply_get_property (ply, elem_name, &vert_props[1]); 
     ply_get_property (ply, elem_name, &vert_props[2]); 


/* grab all the vertex elements */ 
     for (j = 0; j < num_elems; j++) { 
     int move=10; 
     /* grab and element from the file */ 
     vlist[j] = (Vertex *) malloc (sizeof (Vertex)); 
     ply_get_element (ply, (void *) vlist[j]); 


     int vert=sprintf(szFile,"vertex: %g %g %g", vlist[j]->x, vlist[j]->y, vlist[j]->z); 
     /* print out vertex x,y,z for debugging */ 
     TextOut(hDC,600,move+j*20,szFile,vert); 

     Figure->Parameters(vlist[j]->x, vlist[j]->y, vlist[j]->z); 
     } 
    } 

而这正是该类图是，在那里我suppossed绘制一切：

Figure::Figure(){ 
} 
void Figure::Parameters(float x,float y,float z) 
{ 
    this->x1=x; 
    this->y1=y; 
    this->z1=z; 
} 
void Figure::Draw() 
{ 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

    glLoadIdentity(); 
    gluLookAt(0.0,0.0,4.0,0.0,0.0,0.0,0.0,1.0,0.0); 

    glBegin(GL_TRIANGLES); 

    glNormal3f(x1,y1,z1); 

    glVertex3f(x1,y1,z1); 
    glEnd(); 
} 
x1,y1,z1 are declared in Figure.h 

我试着尽我所能解释自己;如果你认为它仍然需要更多的解释，请告诉我，我会尝试以不同的方式解释它

是的，我忘了解释我猜想我想画的图...我没有知道哪个数字，因为我使用OPENFILENAME打开1个随机数字并绘制它我使用三角形，因为我认为用三角形我可以绘制任何东西，而且我在课堂上试过参数要求的顶点数目我是在课堂上处理并做出“for”画但不起作用

Answer 1

您只在开始/结束之间指定一个顶点..您至少需要3个指定三角形。还有更多，如果你想要一个整个buncha三角形。您需要沿着这行更多的东西：

void Figure::Parameters(float x, float y, float z) 
{ 
    m_vertices.push_back(myVertex(x, y, z)); 
} 

void Figure::Draw() 
{ 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

    glLoadIdentity(); 
    gluLookAt(0.0,0.0,4.0,0.0,0.0,0.0,0.0,1.0,0.0); 

    glBegin(GL_TRIANGLES); 

    assert(m_vertices.size() % 3 == 0); // since we're drawing triangles 
    for(size_t i=0; i<m_vertices.size(); i++) 
    { 
     glNormal3f(m_vertices[i].x,m_vertices[i].y,m_vertices[i].z); 
     glVertex3f(m_vertices[i].x,m_vertices[i].y,m_vertices[i].z); 
    } 

    glEnd(); 
}