实验7OpenGL光照

1、.实验 7 OpenGL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 Nate Robin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.专业学习资料.#include<GL/gl

2、ut.h>#include<stdlib.h>static int year =0,day=0;void init(void)GLfloat mat_specular=1.0,1.0,1.0,1.0;GLfloat mat_shininess=50.0;GLfloat light_position=1.0,1.0,1.0,0.0;GLfloat white_light=1.0,1.0,1.0,1.0;GLfloat Light_Model_Ambient=0.2,0.2,0.2,1.0;glClearColor(0.0,0.0,0.0,0.0);glShadeModel(GL

3、_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.专业学习资料.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);/ 光源位置glLightfv(GL_LIGHT0,GL_DIFFUSE,white_light);/ 漫放射光分量

4、强度glLightfv(GL_LIGHT0,GL_SPECULAR, white_light);/ 折射光强度glLightModelfv(GL_LIGHT_MODEL_AMBIENT,Light_Model_Ambient);/ 光源 2 GL_LIGHT1GLfloat mat_specular1=1.0,1.0,1.0,1.0;GLfloat mat_shininess1=50.0;GLfloat light_position1=0.0,0.0,0.0,0.0;GLfloat red_light=1.0,0.0,0.0,1.0;.专业学习资料.GLfloat Light_Model_Am

5、bient1=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);/ 折射光强度glLightModelfv(GL_LIGHT_MODEL_AMBIENT,Light_Model_Ambient1);/ 开启灯光glEnable(GL_LIGHTING);glEnable(GL_LIGHT0);glEnable(G

6、L_LIGHT1);glEnable(GL_DEPTH_TEST);.专业学习资料.void display(void)glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);glPushMatrix();/ 定义太阳的材质并绘制太阳GLfloat sun_mat_ambient= 1.0f, 0.0f, 0.0f, 1.0f;/ 定义材质的环境光颜色，偏红色GLfloat sun_mat_diffuse= 0.5f, 0.5f, 0.0f, 1.0f;/ 定义材质的漫反射光颜色，偏红色GLfloat sun_mat_specular = 1.0f,0

7、.0f, 0.0f, 1.0f;/ 定义材质的镜面反射光颜色，红色GLfloat sun_mat_emission = 0.0f, 0.0f, 0.0f, 1.0f;/ 定义材质的辐射光颜色，为 0GLfloat sun_mat_shininess= 32.0f;glMaterialfv(GL_FRONT,GL_AMBIENT,sun_mat_ambient);glMaterialfv(GL_FRONT,GL_DIFFUSE,sun_mat_diffuse);.专业学习资料.glMaterialfv(GL_FRONT,GL_SPECULAR,sun_mat_specular);glMateri

8、alfv(GL_FRONT,GL_EMISSION,sun_mat_emission);glMaterialf (GL_FRONT,GL_SHININESS,sun_mat_shininess);glutSolidSphere(0.5,40,16);/太阳glRotatef(GLfloat) year,0.0,1.0,0.0);glPushMatrix();GLfloat earth_mat_ambient= 0.0f, 0.0f, 1.0f, 1.0f;/定义材质的环境光颜色，偏蓝色GLfloat earth_mat_diffuse= 0.0f, 0.0f, 0.5f, 1.0f;/ 定义材

9、质的漫反射光颜色，偏蓝色GLfloat earth_mat_specular = 1.0f, 0.0f, 0.0f, 1.0f;/ 定义材质的镜面反射光颜色，红色GLfloat earth_mat_emission = 0.0f, 0.0f, 0.0f, 1.0f;/ 定义材质的辐射光颜色，为 0.专业学习资料.GLfloat earth_mat_shininess= 30.0f;glMaterialfv(GL_FRONT,GL_AMBIENT,earth_mat_ambient);glMaterialfv(GL_FRONT,GL_DIFFUSE,earth_mat_diffuse);glMa

10、terialfv(GL_FRONT,GL_SPECULAR,earth_mat_specular);glMaterialfv(GL_FRONT,GL_EMISSION,earth_mat_emission);glMaterialf(GL_FRONT,GL_SHININESS,earth_mat_shininess);glTranslatef(0.8,0.0,0.0);glRotatef(GLfloat) day,0.0,1.0,0.5);/位置变化glutSolidSphere(0.2,20,8);/地球.专业学习资料.GLfloat earth_mat_ambient= 0.0f, 1.0f

11、, 0.0f, 1.0f;/ 定义材质的环境光颜色 ，偏绿色GLfloatearth_mat_diffuse=0.0f, 0.5f, 0.0f, 1.0f;/ 定义材质的漫反射光颜色 ，偏绿色GLfloat earth_mat_specular = 1.0f, .0f, 0.0f, 1.0f;/定义材质的镜面反射光颜色，红色GLfloatearth_mat_emission=0.0f, 0.0f, 0.0f, 1.0f;/ 定义材质的辐射光颜色，为 0GLfloat earth_mat_shininess= 30.0f;glMaterialfv(GL_FRONT,GL_AMBIENT,eart

12、h_mat_ambient);glMaterialfv(GL_FRONT,GL_DIFFUSE,earth_mat_diffuse);glMaterialfv(GL_FRONT,GL_SPECULAR,earth_mat_specular);.专业学习资料.glMaterialfv(GL_FRONT,GL_EMISSION,earth_mat_emission);glMaterialf(GL_FRONT,GL_SHININESS,earth_mat_shininess);glTranslatef(0.4,0.0,0.0);glRotatef(GLfloat) day,0.0,1.0,0.0);

13、glutSolidSphere(0.1,20,8);/月亮glPopMatrix();glPopMatrix();glutSwapBuffers();glFlush();.专业学习资料.void reshape(int w,int h)glViewport(0,0,(GLsizei) w,(GLsizei) h);glMatrixMode(GL_PROJECTION);glLoadIdentity();if(w<=h)glOrtho(-1.5,1.5,-1.5*(GLfloat)h/(GLfloat)w,1.5*(GLfloat)h/(GLfloat)w,-10.0,10.0);else

14、glOrtho(-1.5*(GLfloat)w/(GLfloat)h,1.5*(GLfloat)w/(GLfloat)h,-1.5,1.5,-10.0,10.0);glMatrixMode(GL_MODELVIEW);glLoadIdentity();gluLookAt(0.0,0.0,5.0,0.0,0.0,0.0,0.0,1.0,0.0);void keyboard(unsigned char key, int x,int y).专业学习资料.switch (key)case 'd':day=(day+10)%360;glutPostRedisplay();break;ca

15、se 'D':day=(day-10)%360;glutPostRedisplay();break;case 'y':year=(year + 5)%360;glutPostRedisplay();break;case 'Y':year=(year-5)%360;.专业学习资料.glutPostRedisplay();break;case 27:exit(0);break;default:break;int main(int argc,char *argv)glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);glutInitWindowSize(500,500);glutInitWindowPosition(100,100);glutCreateWindow(argv0);init();.专业学习资料.glutDispl