Week11 - 07161045

OBJ

• 先到www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10 下載4個檔案，分別為source、data、windows、glut32.dll

• 下載好後，將windows、data、source解壓縮，再將data、glut32.dll拉近windows資料夾

     

     

• 研究data裡的obj檔，並了解v、vn、vt、f的意思

     

• 從source.zip裡面，把glm.h、glm.c、transformation.c 用Notepad++打開並研究它

     

• 將transformation程式碼複製到main.cpp

     

• 把下載裡的glm.c及glm.h複製到桌面的GLUT專案資料夾

• 再把剛剛複製過去的glm.c改名為glm.cpp(因為這個是20年前的程式碼)

     

• 再到CodeBlocks裡加入專案，將glm.cpp加入

     

• 最後將windows裡的data複製到freeglut裡的bin

     

glmReadOBJ() & glmDraw()

• 利用程式碼跑出模型

• 程式碼如下:

#include <GL/glut.h>

#include "glm.h"

GLMmodel * model=NULL;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    if(model==NULL) model = glmReadOBJ("data/Al.obj");

    glmUnitize(model);

    glmFacetNormals(model);

    glmVertexNormals(model, 90);

    glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week11模型");

    glutDisplayFunc(display);

    glutMainLoop();

}

     

• 可加入滑鼠打光，讓模型更有感覺

• 程式碼如下:

#include <GL/glut.h>

#include "glm.h"

GLMmodel * model=NULL;

const GLfloat light_ambient[]  = { 0.4f, 0.4f, 0.4f, 0.4f };

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[] = { -5.3f, -4.0f, -6.0f, 4.3f };///打光

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);

    if(model==NULL) model = glmReadOBJ("data/Al.obj");

    glmUnitize(model);

    glmFacetNormals(model);

    glmVertexNormals(model, 90);

    glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);

    glutSwapBuffers();

}

void motion(int x, int y)

{

    light_position[0]= (x-150)/10.0;

    light_position[1]=-(y-150)/10.0;

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glutPostRedisplay();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week11模型");

    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();

}

     

• 再利用角度程式碼讓模型轉正面

• 程式碼如下:

#include <GL/glut.h>

#include "glm.h"

GLMmodel * model=NULL;

const GLfloat light_ambient[]  = { 0.4f, 0.4f, 0.4f, 0.4f };

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[] = { -5.3f, -4.0f, -6.0f, 4.3f };///打光

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);

    if(model==NULL)

    {

        model = glmReadOBJ("data/Al.obj");

        glmUnitize(model);

        glmFacetNormals(model);

        glmVertexNormals(model, 90);

        glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);

    }

    glPushMatrix();

        glRotatef(180,0,1,0);

        glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);

    glPopMatrix();

    glutSwapBuffers();

}

void motion(int x, int y)

{

    light_position[0]= (x-150)/10.0;

    light_position[1]=-(y-150)/10.0;

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glutPostRedisplay();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week11模型");

    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();

}