用线框模式绘制多边形 glPolygonMode

    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);      
    glBegin(GL_TRIANGLES);//开始以g_ViewMode模式绘制    
    glColor3ub(182.0f,88.0f,157.0f);
    for(int j = 0; j < objAndRoofIndex.size(); j+=2)        // 遍历所有的面
    {
        for(int tex = 0; tex < 3; tex++)                    // 遍历三角形的所有点
        {      
            int index = pLoadModels->g_3DModel[0].pObject[objAndRoofIndex[j]].pFaces[objAndRoofIndex[j+1]].vertIndex[tex];    // 获得面对每个点的索引
            float x,y,z;
            x = pLoadModels->g_3DModel[0].pObject[objAndRoofIndex[j]].pVerts[index].x;
            y = pLoadModels->g_3DModel[0].pObject[objAndRoofIndex[j]].pVerts[index].y;                
            z = pLoadModels->g_3DModel[0].pObject[objAndRoofIndex[j]].pVerts[index].z;
            glVertex3f(x,y,z);
        }
    }
    glEnd();// 绘制结束