week15電腦圖學 Camera

 week15

先到https://jsyeh.org/3dcg10/下載

[win32][data]

把data資料夾放到win32資料夾中

接著執行projection.exe

center->畫面中心

eye->從眼睛看

up->手機拍照食指方向，選轉後食指指的方向

fovy->field of view(y方向)視野的角度

aspect->aspect ratio長寬比

zNear->最近從拿裡開始

zFar->最遠到哪

week15-1

開一個專案

放到final project 的glut裡面

調整 角度 比例 遠 近

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void reshape(int w,int h)

{

    glViewport(0,0,w,h);///視窗會看到2D範圍

    float ar=w / (float) h;///aspect ratuio長寬比

    glMatrixMode(GL_PROJECTION);///先切換到Project矩陣

    glLoadIdentity();///矩陣清空，成為單位矩陣(最一開始的矩陣)

    gluPerspective(60,ar,0.01,1000);///一片空白，在茶壺裡

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt(0,0,1, 0,0,0, 0,1,0);

    glutPostRedisplay();

}

int main(int argc,char **argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week15");

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);///老師把名字變reshape

    glutMainLoop();

}

用滑鼠調整看茶壺的角度

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void reshape(int w,int h)

{

    glViewport(0,0,w,h);///視窗會看到2D範圍

    float ar=w / (float) h;///aspect ratuio長寬比

    glMatrixMode(GL_PROJECTION);///先切換到Project矩陣

    glLoadIdentity();///矩陣清空，成為單位矩陣(最一開始的矩陣)

    gluPerspective(60,ar,0.01,1000);///一片空白，在茶壺裡

    glMatrixMode(GL_MODELVIEW);///做好後切回modle view矩陣

    glLoadIdentity();///矩陣清空，成為單位矩陣(最一開始的矩陣)

    gluLookAt(0,0,1, 0,0,0, 0,1,0);///在0，0，1看茶壺 0，0，0 up是0，1，0

    glutPostRedisplay();

}

float eyeX=0,eyeY=0;

void motion(int x,int y)

{

    eyeX=(x-150.0)/150.0;

    eyeY=(150.0-y)/150.0;

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt(eyeX,eyeY,1, 0,0,0, 0,1,0);

    glutPostRedisplay();

}

int main(int argc,char **argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week15");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);///老師把名字變reshape

    glutMainLoop();

}

開啟final project專案

#include <stdio.h>

#include <GL/glut.h>

#include "glm.h"

GLMmodel * head = NULL;

GLMmodel * body = NULL;

GLMmodel * uparmR = NULL;

GLMmodel * lowarmR = NULL;

int show[4] = {1, 1, 1, 1};

int ID = 3;

FILE*fout=NULL;

FILE*fin=NULL;

float teapotX=0,teapotY=0;

float angle[20]={};

void keyboard(unsigned char key, int x, int y) {

    if(key=='0') ID = 0;

    if(key=='1') ID = 1;

    if(key=='2') ID = 2;

    if(key=='3') ID = 3;

    if(key=='s'){

        if(fout==NULL)fout=fopen("motion.txt","w");

        for(int i=0;i<20;i++){

            fprintf(fout, "%.2f ", angle[i]);

        }

        fprintf(fout, "\n");

    }else if(key=='r'){

        if(fin=NULL)fin=fopen("motion.txt","r");

        for(int i=0;i<20;i++){

            fscanf(fin, "%f",&angle[i]);

        }

        glutPostRedisplay();

    }

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glScalef(0.2, 0.2, 0.2);

        if(body==NULL){

            head = glmReadOBJ("model/head.obj");

            body = glmReadOBJ("model/body.obj");

            uparmR = glmReadOBJ("model/uparmR.obj");

            lowarmR = glmReadOBJ("model/lowarmR.obj");

        }

        if(ID==0) glColor3f(1,0,0);

        else glColor3f(1,1,1);

        if(show[0]) glmDraw(head, GLM_MATERIAL);

        if(ID==1) glColor3f(1,0,0);

        else glColor3f(1,1,1);

        if(show[1]) glmDraw(body, GLM_MATERIAL);

        glPushMatrix();

            glTranslatef(-1.200000, +0.453333, 0);

            glRotatef(angle[2], 0, 0, 1);

            glTranslatef(1.200000, -0.453333, 0);

            if(ID==2) glColor3f(1,0,0);

            else glColor3f(1,1,1);

            if(show[2]) glmDraw(uparmR, GLM_MATERIAL);

            glPushMatrix();

                glTranslatef(-1.959999, +0.113333, 0);

                glRotatef(angle[3], 0, 0, 1);

                glTranslatef(1.959999, -0.113333, 0);

                if(ID==3) glColor3f(1,0,0);

                else glColor3f(1,1,1);

                if(show[3]) glmDraw(lowarmR, GLM_MATERIAL);

            glPopMatrix();

        glPopMatrix();

    glPopMatrix();

    glColor3f(0, 1, 0);

    glutSolidTeapot( 0.02 );

    glutSwapBuffers();

}

int oldX = 0, oldY = 0;

void motion(int x, int y){

    teapotX += (x - oldX)/150.0;

    teapotY -= (y - oldY)/150.0;

    angle[ID] += (x-oldX);

    oldX = x;

    oldY = y;

    printf("glTranslatef(%f, %f, 0);\n", teapotX, teapotY);

    glutPostRedisplay();

}

void mouse(int button, int state, int x, int y)

{

    if(state==GLUT_DOWN){

        oldX = x;

        oldY = y;

    }

    display();

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week12");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}