2020電腦圖學A: Week15

glutPerspective、glFtustum

開啟內建模型

改成glFtustum

攝影機

resize為要更改的區塊

視窗縮放，物件會跟著縮放

將參數改成aspect ratio(ar)，但物件不會被影響

gluLookAt

茶壺-1

程式碼如下:

#ifdef __APPLE__

#include <GLUT/glut.h>

#else

#include <GL/glut.h>

#endif

#include <stdlib.h>

static int slices = 16;

static int stacks = 16;

/* GLUT callback Handlers */

float eyeX=0, eyeY=0, eyeZ=1; ///TODO3 for gluLookAt()

float centerX=0, centerY=0, centerZ=0;///TODO3 for gluLookAt()

static void resize(int width, int height)

{

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

glViewport(0, 0, width, height);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

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

gluPerspective( 60, ar, 0.001, 1000 );///TODO3

///glOrtho(-1,+1, -1,+1, -1,+1);///預設值,很限制

///glOrtho(-3.4, +3.4, -2.2, +2.2, -6.0, +16.0);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity() ;///TODO3 for gluLookAt()

gluLookAt(eyeX,eyeY,eyeZ, centerX,centerY,centerZ, 0,1,0);

}

static void display(void)

{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glutSolidTeapot(0.3);///TODO3,只放我們的Teapot

glutSwapBuffers();

}

///key全刪....

static void idle(void)

{

///TODO3: 等一下要在這裡做動作....

glutPostRedisplay();

}

const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };

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 };

/* Program entry point */

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitWindowSize(640,480);

glutInitWindowPosition(10,10);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("GLUT Shapes");

glutReshapeFunc(resize);

glutDisplayFunc(display);

///glutKeyboardFunc(key);

glutIdleFunc(idle);

glClearColor(1,1,1,1);

glEnable(GL_DEPTH_TEST);

glDepthFunc(GL_LESS);

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();

return EXIT_SUCCESS;

}

茶壺-2

程式碼如下:

* GLUT Shapes Demo

* Written by Nigel Stewart November 2003

* This program is test harness for the sphere, cone

* and torus shapes in GLUT.

* Spinning wireframe and smooth shaded shapes are

* displayed until the ESC or q key is pressed. The

* number of geometry stacks and slices can be adjusted

* using the + and - keys.