在OpenGL中围绕自身旋转对象
我在绕自己旋转房间时遇到了麻烦。 它的中心位于（5,5,0）所以我想如果我用glTranslatef（5,5,5）然后glRotatef（rotateroom，0,0,1）翻译房间和房间里的物品然后画出物品并使用glTranslate（-5，-5,0）它将旋转房间及其中的所有内容大约5,5,0但它似乎仍在旋转（0,0,0）并且我不确定是什么我做错了。 我在这里先向您的帮助表示感谢。
void drawside(){ int i,j; /*for (j = 0; j <= 8; j++) { glBegin(GL_LINE_STRIP); for (i = 0; i <= 30; i++) glEvalCoord2f((GLfloat)i/30.0, (GLfloat)j/8.0); glEnd(); glBegin(GL_LINE_STRIP); for (i = 0; i <= 30; i++) glEvalCoord2f((GLfloat)j/8.0, (GLfloat)i/30.0); glEnd(); }*/ glEvalMesh2(GL_FILL, 0, 20, 0, 20); } void drawRoom(){ //floor glBegin(GL_POLYGON); glColor3f(1,1,1); glNormal3f(0,0,0); glVertex3f(0,0,0); glNormal3f(0,10,0); glVertex3f(0,10,0); glNormal3f(10,10,0); glVertex3f(10,10,0); glNormal3f(10,0,0); glVertex3f(10,0,0); glEnd( ); //wall glBegin(GL_POLYGON); glColor3f(0,0,1); glNormal3f(0,10,0); glVertex3f(0,10,0); glNormal3f(0,10,10); glVertex3f(0,10,10); glNormal3f(10,10,10); glVertex3f(10,10,10); glNormal3f(10,10,0); glVertex3f(10,10,0); glEnd(); //wall2 glBegin(GL_POLYGON); glColor3f(0,1,0); glNormal3f(10,10,0); glVertex3f(10,10,0); glNormal3f(10,10,0); glVertex3f(10,10,10); glNormal3f(10,0,10); glVertex3f(10,0,10); glNormal3f(10,0,0); glVertex3f(10,0,0); glEnd(); } void drawObjects(){ glColor3f(1,0,1); glTranslatef(2,2,0); if(conefill == 1) glShadeModel(GL_FLAT); else glShadeModel(GL_SMOOTH); glutSolidCone(cone,5,10,2); glTranslatef(5,5,0); glColor3f(1,0,0); if(spherefill == 1) glShadeModel(GL_FLAT); else glShadeModel(GL_SMOOTH); glutSolidSphere(sphere,20,20); } void display(){ glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(viewx,viewy, viewz,viewx +lx, 5, viewz + ly,0.0f, 0.0f, 1.0f); //gluLookAt(viewx,viewy,viewz,headup,headright,5,0,0,1); glClear(GL_COLOR_BUFFER_BIT); GLfloat light_position[] = {-1.0,5.0,5.0,0.0}; //GLfloat light_direction[] = {-5,-5,-5}; //GLfloat amb[] = {0,0,0,1}; glLightfv(GL_LIGHT0, GL_POSITION, light_position); //glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION,light_direction); //glLightfv(GL_LIGHT0, GL_AMBIENT,amb); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glTranslatef(5,5,0); glRotatef(rotateroom,0,0,1); glPushMatrix(); drawRoom(); glPopMatrix(); glColor3f(0.0, 0.0, 1.0); glPushMatrix(); glTranslatef(6,3,1); glPushMatrix (); drawside(); glPopMatrix(); glPushMatrix(); //glTranslatef(5,0,0); glRotatef(90,1,0,0); //glTranslatef(-5,0,0); glTranslatef(0,.5,.5); drawside(); glPopMatrix(); glPushMatrix(); //glTranslatef(5,0,0); glRotatef(180,1,0,0); //glTranslatef(-5,0,0); glTranslatef(0,1,0); drawside(); glPopMatrix(); glPushMatrix(); glRotatef(90,0,0,1); glTranslatef(-.5,.5,0); drawside(); glPopMatrix(); glPushMatrix(); glRotatef(270,0,0,1); glTranslatef(.5,.5,0); drawside(); glPopMatrix(); glPopMatrix(); drawObjects(); glTranslatef(-5,-5,0); glPopMatrix(); glutSwapBuffers(); glFlush(); } 你只需要反转istruction的顺序：
glRotatef(rotateroom,0,0,1); glTranslatef(5,5,0);
每当你改变一个点时，你必须反转你想要应用的转换序列。 这个转换矩阵的方式是多重的。