OpenGL编程轻松入门之特殊效果操作-Read.doc

文档介绍：--------------------------校验:_____________-----------------------日期:_____________OpenGL编程轻松入门之特殊效果操作-ReadOpenGL编程轻松入门之特殊效果操作每个物体在不同的环境在会有不同的视觉效果。为了使效果更加真实需要增加特殊效果。voidmyInit(void){ glEnable(GL_BLEND);//激活GL_BLEND glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);//指定像素的数学算法 glEnable(GL_FLAT);}voidmyDisplay(void){ glClear(GL_COLOR_BUFFER_BIT); glColor4f glBegin(GL_POLYGON); glVertex3f(-0 glVertex3f glVertex3f glVertex3f glEnd(); glColor4f glBegin(GL_POLYGON); glVertex3f glVertex3f glVertex3f glVertex3f glEnd(); glColor4f glBegin(GL_POLYGON); glVertex3f glVertex3f glVertex3f glVertex3f glEnd(); glFlush();}voidmyReshape(intw,inth){ glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); if(w<h) else glMatrixMode(GL_MODELVIEW); glLoadIdentity();}intmain(intargc,char**argv){ /*初始化*/ glutInit(&argc,argv); glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutInitWindowSize(300,400); glutInitWindowPosition(200,200); /*创建窗口*/ glutCreateWindow("BLENDPOLYGON"); /*绘制与显示*/ myInit(); glutReshapeFunc(myReshape); glutDisplayFunc(myDisplay); /*进入GLUT事件处理循环*/ glutMainLoop(); return(0);}图九:三个互相重叠的矩形·glBlendFunc(GLenumsfactor,GLenumdfactor)指定像素算法。sfactor指定红,绿,蓝及alpha源混合因素是如何计算的。dfactor指定红,绿,蓝及alpha目标混合因素是如何计算的。例9:绘制一个被雾化的圆锥体,如图十所示,为了观察不同的雾化参数,程序中加入了键盘操作。"shift+1","shift+2"键分别增加和减弱雾化浓度,"shift+3"设置雾化的起始点和终止点,"shift+4"和"shift+5"键改变雾化方程,"shift+6"将雾化颜色由白改为绿色,如图十一所示。GLfloatlight_specular[]={