實驗7 OpenGL光照

1、實驗7 OpenGL光照一、 實驗目的了解掌握OpenGL程序的光照與材質，能正確使用光源與材質函數設置所需的繪制效果。二、 實驗內容（1）下載并運行Nate Robin教學程序包中的lightmaterial程序，試驗不同的光照與材質系數；（2）運行示范代碼1，了解光照與材質函數使用。三、 實驗原理為在場景中增加光照，需要執(zhí)行以下步驟：（1） 設置一個或多個光源，設定它的有關屬性；（2） 選擇一種光照模型；（3） 設置物體的材料屬性。具體見教材第8章8.6節(jié)用OpenGL生成真實感圖形的相關內容。四、 實驗代碼#include<GL/glut.h>#include<stdl

2、ib.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_SMOOTH);/glMaterialfv（材

3、質指定，單值材質參數，具體指針）；glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);/鏡面反射光的反射系數glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);/鏡面反射指數/glLightfv（光源，屬性名，屬性值）； glLightfv(GL_LIGHT0, GL_POSITION, light_position); /光源位置 glLightfv(GL_LIGHT0, GL_DIFFUSE, white_light); /漫放射光分量強度 glLightfv(GL_LIGHT0, GL_SPECU

4、LAR, white_light); /折射光強度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_LIG

5、HT1, GL_POSITION, light_position1); /光源位置 glLightfv(GL_LIGHT1, GL_DIFFUSE, red_light); /漫放射光分量強度 glLightfv(GL_LIGHT1, GL_SPECULAR, red_light); /折射光強度glLightModelfv(GL_LIGHT_MODEL_AMBIENT,Light_Model_Ambient1);/開啟燈光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(); / 定義太陽的材質并繪制太陽 GLfloat sun_mat_ambient = 1.0f, 0.0f, 0.0f, 1.0f; /定義材質的環(huán)境光顏色，偏紅色 GLfloat sun_mat_diffuse = 0.5f, 0.5f, 0.0f, 1.0f; /定義材質的漫反射光顏色，偏紅色 GLfloat sun_mat_specular = 1.0f,0.0f, 0.0f, 1.0f; /定義材質的鏡面反射光顏色，紅色 G

7、Lfloat sun_mat_emission = 0.0f, 0.0f, 0.0f, 1.0f; /定義材質的輻射光顏色，為0 GLfloat 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_emi

8、ssion); glMaterialf (GL_FRONT,GL_SHININESS,sun_mat_shininess); glutSolidSphere(0.5,40,16);/太陽glRotatef(GLfloat) year,0.0,1.0,0.0); glPushMatrix(); GLfloat earth_mat_ambient = 0.0f, 0.0f, 1.0f, 1.0f; /定義材質的環(huán)境光顏色，偏藍色 GLfloat earth_mat_diffuse = 0.0f, 0.0f, 0.5f, 1.0f; /定義材質的漫反射光顏色，偏藍色 GLfloat earth_ma

9、t_specular = 1.0f, 0.0f, 0.0f, 1.0f; /定義材質的鏡面反射光顏色，紅色 GLfloat earth_mat_emission = 0.0f, 0.0f, 0.0f, 1.0f; /定義材質的輻射光顏色，為0 GLfloat 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_SPECU

10、LAR, 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);/位置變化glutSolidSphere(0.2,20,8);/地球GLfloat earth_mat_ambient = 0.0f, 1.0f, 0.0f, 1.0f; /定義材質的環(huán)境光顏

11、色，偏綠色 GLfloat earth_mat_diffuse = 0.0f, 0.5f, 0.0f, 1.0f; /定義材質的漫反射光顏色，偏綠色 GLfloat earth_mat_specular = 1.0f, .0f, 0.0f, 1.0f; /定義材質的鏡面反射光顏色，紅色 GLfloat earth_mat_emission = 0.0f, 0.0f, 0.0f, 1.0f; /定義材質的輻射光顏色，為0 GLfloat earth_mat_shininess = 30.0f; glMaterialfv(GL_FRONT, GL_AMBIENT, earth_mat_ambien

12、t); glMaterialfv(GL_FRONT, GL_DIFFUSE, earth_mat_diffuse); glMaterialfv(GL_FRONT, GL_SPECULAR, earth_mat_specular); glMaterialfv(GL_FRONT, GL_EMISSION, earth_mat_emission); glMaterialf (GL_FRONT, GL_SHININESS, earth_mat_shininess); glTranslatef(0.4,0.0,0.0);glRotatef(GLfloat) day,0.0,1.0,0.0);glutSo

13、lidSphere(0.1,20,8);/月亮 glPopMatrix();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);elseglOrtho(-1.5*

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

15、ay-10)%360;glutPostRedisplay();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);glutCreateWindo