"mały" kłopot z 3d

mam taki program

#include <windows.h>
#include <stdlib.h>
#include <gl/gl.h>
#include <math.h>
#include <stdio.h>
#include <io.h>

LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
void DisableOpenGL(HWND, HDC, HGLRC);

double kat(double xx,double yy)
{
    if (xx>0 && yy>0)
    {
        return sin(yy/(xx*xx+yy*yy));
    }
    else if (xx<0 && yy>0)
    {
        return 90+sin(xx/(xx*xx+yy*yy));
    }
    else if (xx<0 && yy<0)
    {
        return 180+sin(yy/(xx*xx+yy*yy));
    }
    else if (xx>0 && yy<0)
    {
        return 270+sin(xx/(xx*xx+yy*yy));
    }
    else if (xx==yy)
    {
        if (yy==0 && xx>0)
        {
            return 0;
        }
        else if (xx==0 && yy>0)
        {
            return 90;
        }
        else if (yy==0 && xx<0)
        {
            return 180;
        }
        else if (xx==0 && yy<0)
        {
            return 270;
        }
    }
}
double alpha,x,y,z;
void obliczenia_3d(double kat_x,double kat_y,double kat_z)
{
    double xx,yy,zz;
    xx=cos(kat_y*M_PI/180)*x+sin(kat_y*M_PI/180)*z;
    zz=-sin(kat_y*M_PI/180)*x+cos(kat_y*M_PI/180)*z;
    x=xx;
    z=zz;

    yy=cos(kat_x*M_PI/180)*y-sin(kat_x*M_PI/180)*z;
    zz=sin(kat_x*M_PI/180)*y+cos(kat_x*M_PI/180)*z;
    y=yy;
    z=zz;

    xx=cos(kat_z*M_PI/180)*x-sin(kat_z*M_PI/180)*y;
    yy=sin(kat_z*M_PI/180)*x+cos(kat_z*M_PI/180)*y;
    x=xx;
    y=yy;
}

typedef struct punkt
{
    double x,y,z;
    int last;
}punkt;
typedef struct obiekt
{
    double r_x,r_y,r_z,x,y,z;
    struct punkt wektor[100];
}obiekt;
int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpCmdLine,
                   int nCmdShow)
{
    WNDCLASSEX wcex;
    HWND hwnd;
    HDC hDC;
    HGLRC hRC;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;

    /* register window class */
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_OWNDC;
    wcex.lpfnWndProc = WindowProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = "GLSample";
    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;


    if (!RegisterClassEx(&wcex))
        return 0;

    /* create main window */
    hwnd = CreateWindowEx(0,
                          "GLSample",
                          "OpenGL Sample",
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT,
                          CW_USEDEFAULT,
                          800,
                          800,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hwnd, nCmdShow);

    /* enable OpenGL for the window */
    EnableOpenGL(hwnd, &hDC, &hRC);

    /* program main loop */
    int i=0,a=0,c,d,e;
    struct obiekt statek[2];
    FILE *plik;
    char *mode="r";
    plik=fopen("statek.model", mode);
    if (plik == NULL) {
        fprintf(stderr, "Can't open input file in.list!\n");
        exit(1);
    }
    if (fscanf(plik,"%i %i %i",&c,&d,&e) != EOF)
    {
        statek[0].x=c;
        statek[0].y=d;
        statek[0].z=e;
        while (fscanf(plik,"%i %i %i",&c,&d,&e) != EOF)
        {
            statek[0].wektor[i].last=0;
            statek[0].wektor[i].x=c;
            statek[0].wektor[i].y=d;
            statek[0].wektor[i].z=e;
            i=i+1;
        }
    }
    statek[0].wektor[i].last=1;
    fclose(plik);
    statek[0].r_x=35;
    statek[0].r_y=195;
    statek[0].r_z=0;
    while (!bQuit)
    {
        /* check for messages */
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            /* handle or dispatch messages */
            if (msg.message == WM_QUIT)
            {
                bQuit = TRUE;
            }
            else
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
        }
        else
        {
            /* OpenGL animation code goes here */

            glClearColor(0.0f, 0.5f, 0.5f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT);
            i=3;
            while(statek[0].wektor[i-3].last==0)
            {
                glPushMatrix();
                glBegin(GL_POLYGON);

                x=statek[0].wektor[i].x;
                y=statek[0].wektor[i].y;
                z=statek[0].wektor[i].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);
                glColor3f(1.0f, 0.5f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                x=statek[0].wektor[i-1].x;
                y=statek[0].wektor[i-1].y;
                z=statek[0].wektor[i-1].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);
                glColor3f(1.0f, 0.5f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                x=statek[0].wektor[i-2].x;
                y=statek[0].wektor[i-2].y;
                z=statek[0].wektor[i-2].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);
                glColor3f(1.0f, 0.5f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                x=statek[0].wektor[i-3].x;
                y=statek[0].wektor[i-3].y;
                z=statek[0].wektor[i-3].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);
                glColor3f(1.0f, 0.5f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                glEnd();

                glBegin(GL_LINE_LOOP);

                x=statek[0].wektor[i].x;
                y=statek[0].wektor[i].y;
                z=statek[0].wektor[i].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);

                glColor3f(0.0f, 0.0f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                x=statek[0].wektor[i-1].x;
                y=statek[0].wektor[i-1].y;
                z=statek[0].wektor[i-1].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);

                glColor3f(0.0f, 0.0f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                x=statek[0].wektor[i-2].x;
                y=statek[0].wektor[i-2].y;
                z=statek[0].wektor[i-2].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);

                glColor3f(0.0f, 0.0f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                x=statek[0].wektor[i-3].x;
                y=statek[0].wektor[i-3].y;
                z=statek[0].wektor[i-3].z;
                obliczenia_3d(statek[0].r_x,statek[0].r_y,statek[0].r_z);

                glColor3f(0.0f, 0.0f, 0.0f); glVertex3f(x/1000,y/1000,z/1000);

                glEnd();
                glPopMatrix();

                i=i+4;
            }

            SwapBuffers(hDC);
            //statek[0].r_x+=0.3;
            statek[0].r_z+=1;
            //statek[0].r_y+=0.1;
            Sleep (1);
        }
    }

    /* shutdown OpenGL */
    DisableOpenGL(hwnd, hDC, hRC);

    /* destroy the window explicitly */
    DestroyWindow(hwnd);

    return msg.wParam;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        case WM_CLOSE:
            PostQuitMessage(0);
        break;

        case WM_DESTROY:
            return 0;

        case WM_KEYDOWN:
        {
            switch (wParam)
            {
                case VK_ESCAPE:
                    PostQuitMessage(0);
                break;
            }
        }
        break;

        default:
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }

    return 0;
}

void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
    PIXELFORMATDESCRIPTOR pfd;

    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC(hwnd);

    /* set the pixel format for the DC */
    ZeroMemory(&pfd, sizeof(pfd));

    pfd.nSize = sizeof(pfd);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW |
                  PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;

    iFormat = ChoosePixelFormat(*hDC, &pfd);

    SetPixelFormat(*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */
    *hRC = wglCreateContext(*hDC);

    wglMakeCurrent(*hDC, *hRC);
}

void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
{
    wglMakeCurrent(NULL, NULL);
    wglDeleteContext(hRC);
    ReleaseDC(hwnd, hDC);
}

 

i w teorii działa ale nie pokazuje wszystkich ścian we właściwej kolejności... jakieś pomysły?

glEnable(GL_DEPTH_TEST);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);