toto week04

Week04

step01-1

到https://jsyeh.org/3dcg10,下載windows.zip and data.zip

        -windows.zip 解壓縮 下載 \windows\Transformation.exe

        -data.zip         解壓縮 下載\windows\data\有3D模型

開始執行Transformation.exe，觀察汽車的轉法，使用右手來理解(安倍右手)。姆指是動軸，其餘的是轉動的方向。

step01-2 

了解旋轉軸為Y軸時是怎麼轉的，再去了解旋轉軸為X軸是怎麼轉的。最後是Z軸怎麼轉。以右手為座標系統，Z軸是用右手4指，本來向著X軸，掃向Y軸後，Z軸的方向

step01-3

如果為奇怪的旋轉軸，老師以吃鹽酥雞十，用竹籤去插鹽酥雞。

step02-1

CodeBlocks-File_New_Project,GLUT專案，檔名為week04-1 rotate

開啟上周的blog複製茶壺的程式碼

#include <GL/glut.h>

void display()

{

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week03");

    glutDisplayFunc(display);

    glutMainLoop();

}

撰寫程式碼，使得茶壺會轉動

#include <GL/glut.h>

float angle =0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week03");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

step02-2

CodeBlocks-File_New_Project,GLUT專案，檔名為week04-2_rotate_light

先貼上week04-1 rotate，再從177行裡找light找到2大段，並貼上

#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 myLight()

{

    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);

    glutMainLoop();

    return EXIT_SUCCESS;

}

float angle =0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

step03-1

在Transform中，可以交換swapswaptranslate和rotate的程式，會造成自轉、公轉的差別。口訣是:「靠在左肩上，讀程式就從下往上讀」。

step03-2

step03-3

把茶壺加入3行程式碼使茶壺變色

#include <GL/glut.h>

float angle =0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(0.5,0,0);

        glRotatef(angle,0,1,0);

        glColor3f(0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week03");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

step03-4

撰寫新的茶壺(黃色)，並能旋轉至左側

#include <GL/glut.h>

float angle =0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(0.5,0,0);

        glRotatef(angle,0,1,0);

        glColor3f(0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glPushMatrix();

        glRotatef(angle,0,1,0);

        glTranslatef(0.5,0,0);

        glColor3f(1,1,0);

        glTranslatef(0,0.5,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

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

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_RGB|GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week04");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

Step04-1

上傳git