WEEK06
https://jsyeh.org/3dcg10/下載 data win32
windows.zip => 下載 \windows\Light Material.exe
(左下)右鍵，換Meterial
(左下)右鍵，換模型
實作
freeglut裝好，改lib
Ctrl-F找 light
偷程式碼
#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);
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glutSwapBuffers();
}
int main(int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week06 light");
glutDisplayFunc(display);
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();
}
了解打光的作法
#include <GL/glut.h>
#include <stdio.h>
float x=150,y=150,z=0,scale=1.0,angle=0.0;
///使茶壺在正中央
int oldX=0,oldY=0,now=1;///預設為移動
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()
{
glClearColor(0.5,0.5,0.5,1);///R G B A(為半透明，目前沒開)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();///備分矩陣
glTranslatef((x-150)/150.0,-(y-150)/150.0,z);
glRotatef(angle,0,1,0);///對y軸轉動
glScalef(scale,scale,scale);///都縮放成scale倍
glColor3f(1,1,0);
glutSolidTeapot(0.3);
glPopMatrix();///還原矩陣
glutSwapBuffers();
}
void keyboard(unsigned char key,int mousex,int mousey)
{
if(key=='1' || key=='w' || key=='W')now=1;///移動
if(key=='2' || key=='e' || key=='E')now=2;///轉動
if(key=='3' || key=='r' || key=='R')now=3;///縮放
}
void mouse(int botton,int state,int mousex,int mousey)
{
oldX=mousex; oldY=mousey;
}
void motion(int mousex,int mousey)///用滑鼠移動茶壺
{
if(now==1){///移動
x+=(mousex-oldX); y+=(mousey-oldY);
}
else if(now==2){///轉動
angle+=(mousex-oldX);///轉動
}
else if(now==3){///縮放
if((mousex-oldX)>0)scale*=1.01;
if((mousex-oldX)<0)scale*=0.99;
}
oldX=mousex; oldY=mousey;
display();
}
int main(int argc, char**argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06-light");
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
///偷來的程式要放在glutCreateWindow 之後，才會有效
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);
///放在glutMainLoop之前
glutMainLoop();///卡在這裡，之後的程式，都不會執行到
}
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