OpenG: 单模型旋转

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;
}