Week 07

一、期中考題 OpenGL必背10函式

• 第一節課前半，老師先教下週期中考要考的題目。
• 程式碼+中文解釋。

二、 打光 Light

三、練習：Light_material.exe



#include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
 GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

 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();
}
void motion(int x, int y)
{
    light_position[0]= (x-150)/15.0;
    light_position[1]=-(y-150)/15.0;
}
int main(int argc, char ** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week07 light");

    glutDisplayFunc(display);
    glutMotionFunc(motion);

    glEnable(GL_DEPTH_TEST);

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

    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();

}