实验7 OpenGL光照

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1、实验7OpenGL光照一、实验目的了解掌握OpenGL程序的光照与材质，能正确使用光源与材质函数设置所需的绘制效果。二、实验内容（1）下载并运行NateRobin教学程序包中的lightmaterial程序，试验不同的光照与材质系数；（2）运行示范代码1，了解光照与材质函数使用。三、实验原理为在场景中增加光照，需要执行以下步骤：（1）设置一个或多个光源，设定它的有关属性；（2）选择一种光照模型；（3）设置物体的材料属性。具体见教材第8章8.6节用OpenGL生成真实感图形的相关内容。四、实验代码#include

2、>#includestaticintyear=0,day=0;voidinit(void){GLfloatmat_specular[]={1.0,1.0,1.0,1.0};GLfloatmat_shininess[]={50.0};GLfloatlight_position[]={1.0,1.0,1.0,0.0};GLfloatwhite_light[]={1.0,1.0,1.0,1.0};GLfloatLight_Model_Ambient[]={0.2,0.2,0.2,1.0};glClearColor(0

3、.0,0.0,0.0,0.0);glShadeModel(GL_SMOOTH);//glMaterialfv（材质指定，单值材质参数，具体指针）；glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);//镜面反射光的反射系数glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);//镜面反射指数//glLightfv（光源，属性名，属性值）；glLightfv(GL_LIGHT0,GL_POSITION,light_position);//光源位

4、置glLightfv(GL_LIGHT0,GL_DIFFUSE,white_light);//漫放射光分量强度glLightfv(GL_LIGHT0,GL_SPECULAR,white_light);//折射光强度glLightModelfv(GL_LIGHT_MODEL_AMBIENT,Light_Model_Ambient);//光源2GL_LIGHT1GLfloatmat_specular1[]={1.0,1.0,1.0,1.0};GLfloatmat_shininess1[]={50.0};GLfloatlight_pos

5、ition1[]={0.0,0.0,0.0,0.0};GLfloatred_light[]={1.0,0.0,0.0,1.0};GLfloatLight_Model_Ambient1[]={0.2,0.2,0.2,1.0};glLightfv(GL_LIGHT1,GL_POSITION,light_position1);//光源位置glLightfv(GL_LIGHT1,GL_DIFFUSE,red_light);//漫放射光分量强度glLightfv(GL_LIGHT1,GL_SPECULAR,red_light);//折射光强

6、度glLightModelfv(GL_LIGHT_MODEL_AMBIENT,Light_Model_Ambient1);//开启灯光glEnable(GL_LIGHTING);glEnable(GL_LIGHT0);glEnable(GL_LIGHT1);glEnable(GL_DEPTH_TEST);}voiddisplay(void){glClear(GL_COLOR_BUFFER_BIT

7、GL_DEPTH_BUFFER_BIT);glPushMatrix();//定义太阳的材质并绘制太阳{GLfloatsun_mat_am

8、bient[]={1.0f,0.0f,0.0f,1.0f};//定义材质的环境光颜色，偏红色GLfloatsun_mat_diffuse[]={0.5f,0.5f,0.0f,1.0f};//定义材质的漫反射光颜色，偏红色GLfloatsun_mat_specular[]={1.0f,0.0f,0.0f,1.0f};//定义材质的镜面反射光颜色，红色GLfloatsun_mat_emission[]={0.0f,0.0f,0.0f,1.0f};//定义材质的辐射光颜色，为0GLfloatsun_mat_shininess=32.0f

9、;glMaterialfv(GL_FRONT,GL_AMBIENT,sun_mat_ambient);glMaterialfv(GL_FRONT,GL_DIFFUSE,sun_mat_diffuse);glMaterialfv(GL_FRONT,G