06160246_W15

電腦圖學

2019-05-30

(1)主題：攝影機、運鏡

(2)主題：投影、矩陣

(3)主題：位置移動 VS 轉動
(4)複習：背影貼圖

(5)期末作品

先把之前的東西先下載

到http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/下載

freeglut：https://www.transmissionzero.co.uk/software/freeglut-devel/

攝影機、運鏡

eye

center

up

程式碼匯入到Code Block

投影

打光

轉動

#include <GL/glut.h>///GLUT 外掛

#include "glm.h"///glm.cpp for 3D model glmReadOBJ(), glmDraw(), glmUnitized()

GLMmodel * pmodel=NULL;///指標

void drawmodel(void)

{

    if (!pmodel) {

pmodel = glmReadOBJ("data/al.obj");

if (!pmodel) exit(0);

glmUnitize(pmodel);

glmFacetNormals(pmodel);

glmVertexNormals(pmodel, 90.0);

    }

    glmDraw(pmodel, GLM_SMOOTH | GLM_MATERIAL);

}

void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    drawmodel();

    glutSwapBuffers();

}

#include <math.h>///for sin() cos() ///NOW3

float eyeX=2, eyeY=0, eyeZ=0; ///NOW3

void timer(int t)///NOW3

{

    glMatrixMode(GL_PROJECTION); ///NOW4

    glLoadIdentity(); ///NOW4

///glOrtho(-1, +1,  -1,+1, -10.0,10.0); ///NOW4 你可以看到 -10...+10範圍

gluPerspective(60, 1.0, 0.001, 1000);///NOW5

    float angle = (t/180.0)*3.1415926; ///NOW3

    eyeX=2*cos(angle); ///NOW3

    eyeZ=2*sin(angle); ///NOW3

    glutTimerFunc(33, timer, t+1);///NOW3

    glMatrixMode(GL_MODELVIEW);///NOW3

    glLoadIdentity();///NOW3

    gluLookAt( eyeX, eyeY, eyeZ,///eye ///NOW3

           0, 0, 0,///center ///NOW3

               0, 1, 0);///up    ///NOW3

    glutPostRedisplay();///NOW3

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE);

    glutInitWindowSize(512,512);

    glutInitWindowPosition(50, 50);

    glutCreateWindow("week15");

//    glutReshapeFunc(reshape);

    glutDisplayFunc(display);

    glutTimerFunc(33, timer, 0);///NOW3

    GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };

    glEnable(GL_DEPTH_TEST);

glEnable(GL_LIGHTING);

    glEnable(GL_LIGHT0);

    glLightfv(GL_LIGHT0, GL_POSITION, light_pos);

    glutMainLoop();

    return 0;

}