滷蛋說鬼故事 燈光

#include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };  // 顏色 R G B 透明度 1最大 0最小
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };    //
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };   //反光 高光位置
const GLfloat light_position[] = { -5.0f, 4.0f, -5.0f, 1.0f };//光源座標左右 ，上 下，前後，平行光

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };


void display(){
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glutSolidTeapot(0.3);
    glutSwapBuffers();

}
int main(int argc,char *argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("GLUT_shapes");
    glutDisplayFunc(display);

   glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glEnable(GL_DEPTH_TEST);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();
}



用滑鼠移燈光


void motion(int x,int y)  ///todo
{
    GLfloat light_position[] = {2.0f,5.0f,-5.0,0.0f};  //陣列  放茶壺位置
    light_position[0] = (x-150)/150.0*10;                  ///用motion的x座標，算光的位置
    light_position[1] = -(y-150)/150.0 *10;                ///
    glLightfv(GL_LIGHT0, GL_POSITION , light_position);    /// 用函式 把光設好
    glutPostRedisplay();    ////貼個post請GLUT重畫畫面
}


 MAIN 裡放

glutMotionFunc(motion);  //要讓光源移動，用motion函式做