Week15

 week15-1

https://jsyeh.org/3dcg10/  進入網站 下載[data] [win32]從檔案中開啟

解壓縮並將[data]拉到[win32]裡面

開啟  Projection.exe

開啟codeblock 新增一個專案

36行

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

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

一次只能執行一個,另一個要註解掉

 glutReshapeFunc(resize);

決定長寬座高 以Y為主X為輔

開一個新專案 week15-2_gluLookAt

#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);

    float ar = w/(float) h;

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(60,ar,0.01,1000);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt(0,0,1, 0,0,0, 0,1,0);

    glutPostRedisplay();

    }

float eyeX=0, eyeY=0;

void motino(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");

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);

    glutMainLoop();

}