首先聲明自己是這方面的小白，希望大神可以對有問題以及可以優化的地方提出來。也歡迎指出不足和吐槽。希望幫到小白。

自己參考得比較多的網站是這個：
http://www.cppblog.com/doing5552/archive/2009/01/08/71532.html

所有代碼都可以去github免費下載（不怎么喜歡CSDN的積分下載）：
https://github.com/Iamttp/OpenGLTest

不多廢話，好先上這一節的效果圖。

#include <gl/glut.h> #include <iostream>bool mouseDown = false;float xrot = 0.0f; float yrot = 0.0f;float xdiff = 0.0f; float ydiff = 0.0f;// 繪制正方體 void drawBox() {glBegin(GL_QUADS);glColor3f(1.0f, 0.0f, 0.0f);// FRONTglVertex3f(-0.5f, -0.5f, 0.5f);glVertex3f(0.5f, -0.5f, 0.5f);glVertex3f(0.5f, 0.5f, 0.5f);glVertex3f(-0.5f, 0.5f, 0.5f);// BACKglVertex3f(-0.5f, -0.5f, -0.5f);glVertex3f(-0.5f, 0.5f, -0.5f);glVertex3f(0.5f, 0.5f, -0.5f);glVertex3f(0.5f, -0.5f, -0.5f);glColor3f(0.0f, 1.0f, 0.0f);// LEFTglVertex3f(-0.5f, -0.5f, 0.5f);glVertex3f(-0.5f, 0.5f, 0.5f);glVertex3f(-0.5f, 0.5f, -0.5f);glVertex3f(-0.5f, -0.5f, -0.5f);// RIGHTglVertex3f(0.5f, -0.5f, -0.5f);glVertex3f(0.5f, 0.5f, -0.5f);glVertex3f(0.5f, 0.5f, 0.5f);glVertex3f(0.5f, -0.5f, 0.5f);glColor3f(0.0f, 0.0f, 1.0f);// TOPglVertex3f(-0.5f, 0.5f, 0.5f);glVertex3f(0.5f, 0.5f, 0.5f);glVertex3f(0.5f, 0.5f, -0.5f);glVertex3f(-0.5f, 0.5f, -0.5f);// BOTTOMglVertex3f(-0.5f, -0.5f, 0.5f);glVertex3f(-0.5f, -0.5f, -0.5f);glVertex3f(0.5f, -0.5f, -0.5f);glVertex3f(0.5f, -0.5f, 0.5f);glEnd(); }// 繪制函數 void display() {glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);glLoadIdentity();gluLookAt(0.0f, 0.0f, 3.0f,0.0f, 0.0f, 0.0f,0.0f, 1.0f, 0.0f);// 實現鼠標旋轉的核心glRotatef(xrot, 1.0f, 0.0f, 0.0f);glRotatef(yrot, 0.0f, 1.0f, 0.0f);drawBox();glFlush();glutSwapBuffers(); }void resize(int w, int h) {glMatrixMode(GL_PROJECTION);glLoadIdentity();glViewport(0, 0, w, h);gluPerspective(45.0f, 1.0f * w / h, 1.0f, 100.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity(); }// 鼠標事件 void mouse(int button, int state, int x, int y) {if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) {mouseDown = true;xdiff = x - yrot;ydiff = -y + xrot;std::cout << "xdiff:" << xdiff << "\tydiff" << ydiff << std::endl;}elsemouseDown = false; }// 鼠標移動事件 void mouseMotion(int x, int y) {if (mouseDown) {yrot = x - xdiff;xrot = y + ydiff;std::cout << "yrot:" << yrot << "\txrot" << xrot << std::endl;glutPostRedisplay();} }int main(int argc, char* argv[]) {glutInit(&argc, argv);glutInitWindowPosition(50, 50);glutInitWindowSize(500, 500);glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);glutCreateWindow("demo");glutDisplayFunc(display);glutMouseFunc(mouse);glutMotionFunc(mouseMotion);glutReshapeFunc(resize);glClearColor(0.93f, 0.93f, 0.93f, 0.0f);glEnable(GL_DEPTH_TEST);glDepthFunc(GL_LEQUAL);glClearDepth(1.0f);glutMainLoop();return 0; }

可以看到代碼非常的簡潔，這是根據國外的一個示例代碼縮減的。關鍵就是并不是改變了攝像頭的視角（gluLookAt）,而是直接在繪制之前就旋轉坐標系，讓之后繪制的東西都直接旋轉了。讓我們看起來像攝像頭視角在動（我只能說真cool）。

OpenGL專欄： https://blog.csdn.net/qq_40515692/article/details/103938499

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