2017電腦圖學A: Week08 三個ㄌ上課筆記

1.複習期中模擬考

glPushMatrix();///備份矩陣
    glRotatef(angle,x,y,z);///旋轉
    glTranslatef(x,y,z);///移動
    glScalef(x,y,z);///縮放
    glBegin(GL_POLYGON);///開始畫
        glNormal3f(nx,ny,nz);///法向量
        glTexCoord2f(tx,ty);///貼圖座標
        glColor3f(r,g,b);///顏色
        glVertex3f(x,y,z);///頂點
    glEnd();///結束畫
glPopMatrix();///還原矩陣

2幫茶壺打光

刪程式碼口訣

(1)找light留8行

(2)找light留8行

(3)找light留8行

(4)留你的display()

(5)留你的main()

#include <GL/glut.h>

static void display(void)
{
const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
const double a = t*90.0;

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3d(1,0,0);
    glPushMatrix();
    glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();
}

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_CULL_FACE);
    glCullFace(GL_BACK);

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;
}

2.讓茶壺可以旋轉

#include <GL/glut.h>
float angle=0;
static void display(void)
{
    angle++;
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glColor3d(1,0,0);
    glPushMatrix();
    glRotatef(angle,0,1,0);
    glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();
}