week08

期中考必考程式

• 拼字、大小寫不能錯
• 參數要加、個數不能錯
• 要中文註解，解釋意思

glPushMatrix();///備份矩陣
glTranslatef(x,y,z);///位置
glRotatef(angel,x,y,z);///旋轉角度
glScalef(x,y,z);///放大縮小

glBegin(GL_POLYGON);///開始畫
glColor3f(r,g,b);///顏色
glTexCoord2f(tx,ty);///貼圖座標
glNormal3f(nx,ny,nz);///(打光)法向量
glVertex2f(x,y);///頂點
glEnd();///結束畫

glPopMatrix();///還原矩陣

#include <GL/glut.h>

///陣列的宣告，裡面有光的值

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 };

const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

///裡面有material的值

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_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Week08");

    ///開啟3D

glEnable(GL_DEPTH_TEST);

///打開第一個燈光

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

///光的設定值

    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);

///material的設定值

    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);

    glutDisplayFunc(display);

    glutMainLoop();

}

滑鼠光源移動

void motion(int x, int y)

{

    light_position[0] = (x-150)/150.0;

    light_position[1] =-(y-150)/150.0;

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glutPostRedisplay();

}

在 main()裡加上 glutMotionFunc(motion);

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };///const要刪掉

const 固定且無法變更的參數

GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

除的值能改變光源遠近

         light_position[0] = (x-150)/15.0;

         light_position[1] =-(y-150)/15.0;