试验OpenGL光照

1、实验7 OpenGL光照一、实验目的了解掌握OpenG即序的光照与材质，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#include<GL/glut.h>#include<stdlib.h&

2、gt;static int year =0,day=0;void init(void)GLfloat mat_specular=1.0,1.0,1.0,1.0;GLfloat mat_shininess尸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;glClearC010r(0.0,0.0,0.0,0.0);glShadeModel(GL_SMOOTH);/glMaterialfv (材质指定，

3、单值材质参数，具体指针) ；glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);僮面反射光的 反射系数glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);/橙 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 量强度glLightfv(GL_LIGHT0, GL_SPEC

4、ULAR, 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;GLfloat Light_Model_Ambient1=0.2,0.2,0.2,1.0;glLightfv(GL_LI

5、GHT1, 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(GL_LIGHT1);glEnable(GL_DEPTH_TEST)

6、;)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口= 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口 = 1.0f,0.0f, 0.0f, 1.0f; 定义材 质的镜面反射光颜色，红色GLfl

7、oat sun_mat_emission口 = 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);glMaterialfv(GL_FRONT,GL_SPECULAR,sun_mat_specular);glMaterialfv(GL_FRONT,GL_EMISSION,sun_mat_emission)

8、;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 材质的漫反射光颜色，偏蓝色GLfloat earth_mat_specul

9、ar = 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 0GLfloat earth_mat_shininess = 30.0f;glMaterialfv(GL_FRONT, GL_AMBIENT, earth_mat_ambient);glMaterialfv(GL_FRONT, GL_DIFFUSE, earth_mat_diffuse);glMaterialfv(GL_FRONT, GL_SPECULAR, earth_m

10、at_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GLfloat earth_mat_ambient = 0.0f, 1.0f, 0.0f, 1.0f;/定义材质的环境光颜色，偏绿色GLfloat e

11、arth_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GLfloat earth_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;GL_AMBIENT,GL_DIFFUSE,GL_SPECULAR,GL_EMISSION,GL_SHININESS,glMaterialf

12、v(GL_FRONT, earth_mat_ambient);glMaterialfv(GL_FRONT, earth_mat_diffuse);glMaterialfv(GL_FRONT, earth_mat_specular);glMaterialfv(GL_FRONT, earth_mat_emission);glMaterialf(GL_FRONT,earth_mat_shininess);glTranslatef(0.4,0.0,0.0);glRotatef(GLfloat) day,0.0,1.0,0.0);glutSolidSphere(0.1,20,8);/ 月亮glPopMa

13、trix();glPopMatrix();glutSwapBuffers();glFlush();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 glOrtho(-1.5*(GLfloat)w/(GLfloat)h,1.5*(G

14、Lfloat)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)switch (key)case 'd':day=(day+10)%360;glutPostRedisplay();break;case 'D':day=(day-10)%360;glutPostRedispl

15、ay();break;case 'y':year=(year + 5)%360;glutPostRedisplay();break;case 'Y':year=(year-5)%360;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(a