opengl 正方体+模拟视角旋转

 // first_3D.cpp : 定义控制台应用程序的入口点。
 //

 #include "stdafx.h"
 #include <GL/glut.h>
 #include <math.h>

 // 将立方体的八个顶点保存到一个数组里面
 static const GLfloat vertex_list[][] = {
     -0.5f, -0.5f, -0.5f,
      0.5f, -0.5f, -0.5f,
     -0.5f,  0.5f, -0.5f,
      0.5f,  0.5f, -0.5f,
     -0.5f, -0.5f,  0.5f,
      0.5f, -0.5f,  0.5f,
     -0.5f,  0.5f,  0.5f,
      0.5f,  0.5f,  0.5f,
 };
 //变换后数组
 GLfloat vertex_list_new[][] = {
     -0.5f, -0.5f, -0.5f,
      0.5f, -0.5f, -0.5f,
     -0.5f,  0.5f, -0.5f,
      0.5f,  0.5f, -0.5f,
     -0.5f, -0.5f,  0.5f,
      0.5f, -0.5f,  0.5f,
     -0.5f,  0.5f,  0.5f,
      0.5f,  0.5f,  0.5f,
 };

 void work(float T[][])
 {
     GLfloat list_temp[][];
     for(int i=;i<;i++)
         for(int j=;j<;j++)
             list_temp[i][j] = vertex_list_new[i][j];
     for(int i=;i<;i++)
     {
         for(int j=;j<;j++)
         {
             float sum = ;
             for(int k=;k<;k++)
             {
                 sum+=list_temp[i][k]*T[k][j];
             }
             vertex_list_new[i][j] = sum;
         }
     }
     return;
 }
 // 将要使用的顶点的序号保存到一个数组里面
 static const GLint index_list[][] = {
     , , , ,
     , , , ,
     , , , ,
     , , , ,
     , , , ,
     , , , ,
 };

 void display()
 {
     glClear(GL_COLOR_BUFFER_BIT);
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
     //gluLookAt(1.5,1.0,1.0,0.0,0.0,0.0,0.0,1.0,0.0);//视点

     /* /坐标轴
     glLineWidth(1);
     glColor3f( 0.0, 0.0, 0.0);     // 黑色
     glBegin(GL_LINES);
     glVertex3f(-0xFFFFFFF,0,0);
     glVertex3f(0xFFFFFFF,0,0);
     glVertex3f(0,-0xFFFFFFF,0);
     glVertex3f(0,0xFFFFFFF,0);
     glVertex3f(0,0,-0xFFFFFFF);
     glVertex3f(0,0,0xFFFFFFF);
     glEnd();
     //坐标轴绘制结束*/

     /* /绘制原立方体
     glColor3f( 1.0, 1.0, 0.0);
     //glBegin(GL_QUADS);
     for(int i=0; i<6; ++i)         // 有六个面，循环六次
     {
         glBegin( GL_LINE_LOOP);
         for(int j=0; j<4; ++j)     // 每个面有四个顶点，循环四次
         {
             glVertex3fv(vertex_list[index_list[i][j]]);
         }
         glEnd();
     }
     //立方体绘制结束*/

     //绘制新立方体
     glColor3f( 1.0, 0.0, 0.0);
     //glBegin(GL_QUADS);
     for(int i=; i<; ++i)         // 有六个面，循环六次
     {
         glBegin( GL_LINE_LOOP);
         for(int j=; j<; ++j)     // 每个面有四个顶点，循环四次
         {
             glVertex3fv(vertex_list_new[index_list[i][j]]);
         }
         glEnd();
     }
     //立方体绘制结束
     glFlush();
     glutSwapBuffers();
 }

 void reshape(int w,int h)
 {
     glViewport(,,w,h);
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);
 } 

 void init()
 {
     glClearColor( , , , 0.0);
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     //glOrtho(-4.0,4.0,-4.0,4.0,-4.0,4.0);
     glMatrixMode(GL_MODELVIEW);
 }

 int main(int argc,char** argv)
 {
     //计算部分
     float a,b,c;//Ov
     a = ;
     b = ;
     c = ;
     float R = sqrt(a*a+b*b+c*c);
     float d = 1.0;
     float costh = c/sqrt(a*a+c*c);
     float sinth = a/sqrt(a*a+c*c);
     float cosfy = b/R;
     float sinfy = sqrt(a*a+c*c)/R;

     float T1[][] = {{,,,},{,,,},{,,,},{-a,-b,-c,}};                    //原点到视点平移变换矩阵
     float T2[][] = {{-costh,,-sinth,},{,,,},{sinth,,-costh,},{,,,}};    //绕y1轴旋转变换
     float T3[][] = {{,,,},{,sinfy,-cosfy,},{,cosfy,sinfy,},{,,,}};      //绕x2轴旋转变换
     float T4[][] = {{-,,,},{,,,},{,,,},{,,,}};                      //关于y3Ovz3面的反射变换
     //work(T1);work(T2);work(T3);work(T4);

     //世界--观察坐标系 合成矩阵
     float Tv[][] = {{cosfy,-cosfy*sinth,-sinfy*sinth,},{,sinfy,-cosfy,},{-sinth,-cosfy*costh,-sinfy*costh,},{,,R,}};
     //work(Tv);

     float Tpersp[][] = {{,,,},{,,,},{,,,/d},{,,,}}; //透视矩阵
     float Tproj[][] = {{-,,,},{,,,},{,,,},{,,,}};   //投影矩阵
     //work(Tpersp);work(Tproj);
     float Ts[][] = {{,,,},{,,,},{,,,/d},{,,,}};     //合成
     //work(Ts);

     //总合成
     float T[][] = {{costh,-costh*sinth,,-sinfy*sinth/d},{,sinfy,,-cosfy/d},{-sinth,-cosfy*costh,,-sinfy*costh/d},{,,,R/d}};
     work(T);

     float T_1[][] = {{,,,},{,,,},{,,,-/d},{,,,R/d}};
     //work(T_1);

     glutInit(&argc,argv);
     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
     glutInitWindowSize(,);
     glutInitWindowPosition(,);
     glutCreateWindow("立方体");
     glutReshapeFunc(reshape);
     glutDisplayFunc(display);
     init();
     glutMainLoop();
     return ;
 }