諺哥電腦圖學筆記 week06

week06

Light Material.exe

 Step01-1 打開網頁https://jsyeh.org/3dcg10/ 下載win32.zip 以及data.zip

step01-2 解壓縮 windows至windows資料夾並且將data資料夾放入windows資料夾

step01-3 打開Light Material.exe 嘗試使用，下面區域可試交換兩行程式碼(移動，轉動)會有自轉，公轉效果。

(左上)左鍵drag可旋轉

(左上)右鍵換模型

(左下)右鍵換Material

Glfloat light_pos[]={ x , y , z , 1}; 是調整光的照射位置。

glLightfv(GL_LIGHT0, GL_POSITION ,light_pos) ; 前面的fv是指 float vector 

 GL_LIGHT0 為第幾個燈、GL_POSITION為設定它的位置。

 剩下的ka kd ks都是調光的性質。

中心照射過去

從物品底下照光

#include <GL/glut.h>

#include <stdio.h>

float x=150,y=150,z=0, scale=1.0,angle=0.0;

int oldX=0,oldY=0,now=1;

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 };

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()

{

    glClearColor(0.5,0.5,0.5,1);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glTranslatef((x-150)/150.0,-(y-150)/150.0,z);

    glRotatef(angle,0,1,0);

    glScalef(scale,scale,scale);

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

 void keyboard( unsigned char key,int mouseX,int mouseY)

{

    if(key=='1' || key=='w' || key=='W')now==1;

     if(key=='2' || key=='e' || key=='E')now==2;

      if(key=='3' || key=='r' || key=='R')now==3;

}

void mouse(int button,int state,int mouseX,int mouseY)

{

    oldX = mouseX; oldY=mouseY;

}

void motion(int mouseX,int mouseY)

{

    if(now==1){

            x+=(mouseX-oldX); y+=(mouseY-oldY);}

    else if(now==2){

        angle +=(mouseX-oldX);

    } else if(now==3){

        if(mouseX-oldX>0) scale *=1.01;

        if(mouseX-oldX<0) scale *=0.99;

    }

    angle +=(mouseX-oldX);

    oldX=mouseX; oldY=mouseY;

    display();

}

int main(int argc, char **argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06 ");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glEnable(GL_DEPTH_TEST);///3D功能

    glDepthFunc(GL_LESS);

    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();

}