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隨着我的代碼,當我旋轉Modelview;它會分別旋轉每個對象。
我想旋轉整個視圖平面。我怎樣才能做到這一點?OpenGL旋轉場景不如預期
我知道gluLookAt,但我想了解這背後的數學。
這是我的代碼:
Prepare_scene只叫在OpenGL的初始化和窗口重塑
// prepare_scene
glViewport(0, 0, windowWidth, windowHeight);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, windowWidth, 0, windowHeight, 0, 40);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH); // Enable Smooth Shading
glClearDepth(1.0f); // Depth Buffer Setup
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
glHint(GL_POINT_SMOOTH_HINT, GL_NICEST);
glEnable(GL_POINT_SMOOTH);
glPointSize(4);
glClearColor(0.0f, 0.0f, 0.0f, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
渲染被稱爲每調勻
// render
glClearColor(0.0f, 0.0f, 0.0f, 1); // black
//glClearColor(1.0f, 1.0f, 1.0f, 1); // white
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//
// try to control the camera
// push_matrix (and at the end of render, add pop_matrix)
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glTranslatef(eye_x, eye_y, eye_z);
glRotatef(x_angular, 0, 1, 0);
// Go back to projection mode
glMatrixMode(GL_PROJECTION);
GLfloat mat_black[] = {0.0,0.0,0.0, 1.0};
// Transparent white-grey window
GLfloat mat_specular_w[] = {0.8,0.88,0.88, 1.0};
GLfloat mat_shine_w[] = {20.0};
glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular_w);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_specular_w);
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_specular_w);
glMaterialfv(GL_FRONT, GL_SHININESS, mat_shine_w);
// for each object in objects:
glPushMatrix();
// object "world coordinates"
// in glTranslatef(x,y,z); // z is always 0; for this test
glTranslatef((*obj_i)->anchor[0] , (*obj_i)->anchor[1], (*obj_i)->anchor[2]);
glutWireSphere((*obj_i)->r, 15, 15);
//glutSolidSphere((*obj_i)->r, 30, 30); // (*obj_i)->r
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glFlush();
SwapBuffers(hdc);