北方工业大学 计算机图形学实验 几何变换
四．用OpenGL函数库实现几何图元旋转特效
在Nehe教程Lesson04基础上，修改程序，在屏幕上画两个三角形、两个四边形，并完成相应动画效果，三角形A绕X轴旋转，三角形B绕Y轴旋转，四边形C绕Z轴旋转，四边形D绕X轴旋转。
要求给出RenderScene函数及实例截图。 int DrawGLScene(GLvoid) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glTranslatef(-1.5f,0.0f,-6.0f); glRotatef(rtri1,1.0f,0.0f,0.0f); glBegin(GL_TRIANGLES); glColor3f(1.0f,0.0f,0.0f); glVertex3f( 0.0f, 1.0f, 0.0f); glColor3f(1.0f,0.0f,0.0f); glVertex3f(-1.0f,-1.0f, 0.0f); glColor3f(1.0f,0.0f,0.0f); glVertex3f( 1.0f,-1.0f, 0.0f); glEnd(); glLoadIdentity(); glTranslatef(-4.5f,0.0f,-6.0f); glRotatef(rtri2,0.0f,1.0f,0.0f); glBegin(GL_TRIANGLES); glColor3f(1.0f,0.0f,0.0f); glVertex3f( 0.0f, 1.0f, 0.0f); glColor3f(1.0f,0.0f,0.0f); glVertex3f(-1.0f,-1.0f, 0.0f); glColor3f(1.0f,0.0f,0.0f);
