OpenG: 光照
1.绘制带有光照效果的场景；
2.场景包含3个茶壶，通过键盘1,2,3可以分别选中三个茶壶，然后用鼠标对每个茶壶进行分别的旋转；
3.使用点光源，点光源为白色，以白色的球体表示；
4.使用3个不同的点光源
i. 光源1的坐标设置在世界坐标系中，并围绕着三个茶壶的中心进行圆周运动；
ii. 光源2 的坐标 设置在观察坐标系，不发生变化；
iii. 光源3的坐标设置在茶壶1的物体坐标系中，当茶壶1被选中进行旋转时，光源3要跟随茶壶1 做相同的旋转；
#include <windows.h>
#include <GL/glut.h>
#include <GL/glext.h>
#include <GL/SOIL.h>
#include <cstdio>
GLfloat r1 = 0.0f;
GLfloat r2 = 0.0f;
GLfloat r3 = 0.0f;
GLfloat rlight1 = 0.0f;
GLfloat mat_specular[] = {1.0f,1.0f,1.0f,1.0f};
GLfloat low_shiniess[] = {5.0}; // 镜面反射
GLfloat material1[] = {1.0f,0.0f,0.0f,1.0f};
GLfloat material2[] = {0.0f,1.0f,0.0f,1.0f};
GLfloat material3[] = {0.0f,0.0f,1.0f,1.0f};
GLfloat light_position1[] = {0.0f,0.0f,4.0f,1.0f};
GLfloat light_diffuse1[] = {1.0f,1.0f,1.0f,1.0f}; //白光
GLfloat light_position2[] = {1.0f,-2.0f,1.0f,1.0f}; //红光
GLfloat light_diffuse2[] = {1.0f,0.0f,0.0f,1.0f};
GLfloat light_position3[] = {0.0f,0.0f,2.0f,1.0f};
GLfloat light_diffuse3[] = {0.0f,0.0f,1.0f,1.0f};// 蓝光
GLfloat light_specular3[] = {1.0f,1.0f,1.0f,1.0f};
//漫射光
void init ()
{
glShadeModel(GL_SMOOTH);
glClearColor(0.0,0.0,0.0,0.0);
glClearDepth(1.0);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT,GL_NICEST);
glEnable(GL_LIGHTING);
//glMaterialfv(GL_FRONT,GL_SPECULAR,mat_specular);
//glMaterialfv(GL_FRONT,GL_SHININESS,low_shiniess);
}
void reshape(int w,int h)
{
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0,(GLfloat)w/(GLfloat)h,0.1,100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0.0f,0.0f,10.0f,
0.0f,0.0f,0.0f,
0.0f,1.0f,0.0f);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotated(rlight1,0.0f,1.0f,0.0f);
glLightfv(GL_LIGHT0,GL_POSITION,light_position1);
glLightfv(GL_LIGHT0,GL_DIFFUSE,light_diffuse1); //世界坐标系光源
glPopMatrix();
glPushMatrix();
glDisable(GL_LIGHTING);
glRotated(rlight1,0.0f,1.0f,0.0f);
glTranslatef(0.0f,0.0f,4.0f);
glColor3f(1.0f,1.0f,1.0f); //光源1 白光 的小球
glutSolidSphere(0.05,10,10);
glEnable(GL_LIGHTING);
glPopMatrix();
glLightfv(GL_LIGHT1,GL_POSITION,light_position2);
glLightfv(GL_LIGHT1,GL_DIFFUSE,light_diffuse2); //观察坐标系光源
glPushMatrix();
glDisable(GL_LIGHTING);
glTranslatef(1.0f,-2.0f,1.0f); //光源2 红光的小球
glColor3f(1.0f,0.0f,0.0f);
glutSolidSphere(0.05,10,10);
glEnable(GL_LIGHTING);
glPopMatrix();
//teapot1
glPushMatrix();
glTranslatef(0.0f,2.0f,0.0f);
glRotatef(r1,0.0f,1.0f,0.0f);
//glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,material1);
glLightfv(GL_LIGHT2,GL_POSITION,light_position3);
glLightfv(GL_LIGHT2,GL_DIFFUSE,light_diffuse3);
glLightfv(GL_LIGHT2,GL_SPECULAR,light_specular3); //
glLightf(GL_LIGHT2,GL_SPOT_CUTOFF,45.0f);
glPushMatrix();
glDisable(GL_LIGHTING);
glTranslated(0.0f,0.0f,2.0f);
glRotatef(r1,0.0f,1.0f,0.0f);
glColor3f(0.0f,0.0f,1.0f); //蓝色光源的小球
glutSolidSphere(0.05,10,10);
glEnable(GL_LIGHTING);
glPopMatrix();
glutSolidTeapot(1.0f);
glPopMatrix();
//teapot2
glPushMatrix();
glTranslatef(-2.5f,-1.0f,0.0f);
glRotatef(r2,1.0f,0.0f,0.0f);
//glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,material2);
//glColor3f(1.0f,0.0f,0.0f);
glutSolidTeapot(1.0f);
glPopMatrix();
//teapot3
glPushMatrix();
glTranslatef(2.5f,-1.0f,0.0f);
glRotatef(r3,0.0f,0.0f,1.0f);
//glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,material3);
//glColor3f(1.0f,1.0f,0.0f);
glutSolidTeapot(1.0f);
glPopMatrix();
glFlush();
}
void mouse_move1(int x,int y)
{
r1+=10.0f;
glutPostRedisplay();
}
void mouse_move2(int x,int y)
{
r2+=10.0f;
glutPostRedisplay();
}
void mouse_move3(int x,int y)
{
r3+=10.0f;
glutPostRedisplay();
}
void rotate1()
{
rlight1+=1.0f;
if(rlight1>360.0)
rlight1 = rlight1-360;
glutPostRedisplay();
}
void keyboard(unsigned char key,int x,int y)
{
switch(key)
{
case '1':
glutMotionFunc(mouse_move1);
break;
case '2':
glutMotionFunc(mouse_move2);
break;
case '3':
glutMotionFunc(mouse_move3);
break;
case 'r':
glutIdleFunc(rotate1);
break;
case 's':
glutIdleFunc(NULL);
break;
case 'a': // light1
glDisable(GL_LIGHT1);
glDisable(GL_LIGHT2);
glEnable(GL_LIGHT0);
glutPostRedisplay();
break;
case 'b': //light2
glDisable(GL_LIGHT0);
glDisable(GL_LIGHT2);
glEnable(GL_LIGHT1);
glutPostRedisplay();
break;
case 'c': //light2
glDisable(GL_LIGHT1);
glDisable(GL_LIGHT0);
glEnable(GL_LIGHT2);
glutPostRedisplay();
break;
}
}
/*void mouse(int button,int state,int x,int y)
{
switch(button){
case GLUT_LEFT_BUTTON:
if(state == GLUT_DOWN)
break;
case GLUT_RIGHT_BUTTON:
if(state == GLUT_DOWN)
break;
}
}*/
int main(int argc,char **argv)
{
printf("keyboard 1,2,3 choose the teapot mousemove control\n");
printf("keyboard r light1 rotated, s stop");
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(900,600);
glutInitWindowPosition(400,100);
glutCreateWindow("hello world");
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
//glutMouseFunc(mouse);
glutMainLoop();
return 0;
}
http://www.cnblogs.com/xibaohe/archive/2013/05/05/3061544.html