Week15_10160863_Camera、投影、運鏡

 Week15_Camera、投影、運鏡

到https://jsyeh.org/3dcg10/下載win32、data

解壓縮win32&data，將data拉到win32資料夾裡

並開啟Projection.exe觀察參數

視角改變eye向量

中心改變center向量

橫拍直拍up向量

開啟codeblock命名為week15-1_glutPerspective

static void resize(int width, int height)

{

    const float ar = (float) width / (float) height;

    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);  ///week15_step02-02 切換成投影矩陣

    glLoadIdentity();  ///weeek15_step02_2 還原成單位矩陣

    ///glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

    ///glOrtho(-ar*3, ar*3, -1*3, 1*3, -100, +100);

    gluPerspective(60, ar, 0.01, 1000);

    ///week15_step02_02 角度,比例,近的,遠的

    

    glMatrixMode(GL_MODELVIEW); ///week15_step02_02 切換成 Model View

    glLoadIdentity() ; ///week15_step02_02 還原成單位矩陣

}

開啟新專案命名為week15-2_glutLookAt

拉茶壺可以自由變形

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);

    glutMainLoop();

}

#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; ///0:頭 , 1:身體 , 2:上手臂 , 3:下手臂

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(-1.273334, +0.540000, 0);

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

            glTranslatef(1.273334, -0.540000, 0);

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

            else glColor3f(1,1,1);

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

            glPushMatrix();

                glTranslatef(-1.933332, +0.106667, 0);

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

                glTranslatef(1.933332, -0.106667, 0);

                //glTranslatef(teapotX, teapotY, 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;

        ///angle = x;

        ///angle = x;

    }

    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();

}