WEEK06

-常用GL程式-

(期中考)

glPushMatrix();  //Push備份矩陣

    glTranslatef( x, y, z);  //移動

    glRotatf( angle, x, y, z); //旋轉

    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);  //色彩

        glVertex3f( x, y, z);  //頂點

    glEnd();

glPopMatrix();  //Pop還原矩陣

-課堂作業1-

展示光線角度及色彩

-課堂作業2-

先叫出GLUT檔

點開main.cpp

->Ctrl+F find light尋找下圖框框部分

->貼到 display() 之前

Ctrl+F Find LIGHT0 尋找下圖框框部分

->貼到main函式裡面

將立體茶壺打光

position在5.0 為背面->呈現暗色

換面打光

position 在-5.0->呈現亮色

-程式碼-

#include <GL/glut.h>

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 };

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main (int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("hello 3D");

    glutDisplayFunc(display);

    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();

}

-課堂作業3-

調整其數值以改變顏色