電腦圖學筆記

 

1. 至https://jsyeh.org/3dcg10 下載data , win32
2. windows.zip解壓縮 >> windows / transformation.exe
3. data.zip解壓縮 >> windows / data / 模型obj
4. 把data檔案放進windows >> 執行transformation.exe

        主角 Light Material.exe

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moodle下載freeglut.zip >> 解壓縮至桌面 >> freeglut資料夾 >> lib >> 將libfreeglut.a複製貼上 >> 重新命名libglut32.a (此步驟才能讓codeblocks跑) 

codeblocks 17.12 >> file >> new >> project >>選GLUT >> 存桌面 >> next >> 設定GULT目錄 >> 跑程式

1. Ctrl+F搜尋light
2. 有陣列宣告、函式呼叫

#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 };

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()

{

        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

        glutSwapBuffers();

}

/* Program entry point */

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06 light");

    glutDisplayFunc(display);

///偷來的程式要放glutCreateWindow之後才會有效

    glEnable(GL_DEPTH_TEST);

    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);

///放在glutMainLoop之前

    glutMainLoop();

}

茶壺光源

#include <GL/glut.h>

#include <stdio.h>

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

int oldX=0,oldY=0;

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);

        glScalef(scale,scale,scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

        glPopMatrix();

        glutSwapBuffers();

}

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

{

}

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

{

     oldX = mouseX; oldY = mouseY;

}

/* Program entry point */

void motion(int mouseX,int mouseY)

{

    if(mouseX-oldX >0 )scale *= 1.01;

    if(mouseX-oldX <0 )scale *=0.99;

    oldX = mouseX; oldY = mouseY;

    display();

}

int main(int argc,char** argv){

    glutInit( &argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("第5週的程式");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

隨著滑鼠放大縮小

#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;

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)

{

}

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

{

     oldX = mouseX; oldY = mouseY;

}

/* Program entry point */

void motion(int mouseX,int mouseY)

{

   /// 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("第5週的程式");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

可旋轉

#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;

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;

}

/* Program entry point */

void motion(int mouseX,int mouseY)

{

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

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

   ///angle+=(mouseX-oldX);

   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(mouseY-oldY <0) scale *=0.99;

   }

    oldX = mouseX; oldY = mouseY;

    display();

}