week05打光

將windows解壓縮，glut32.dll跟data的資料放進去

點擊Light Material開啟檔案

 

GLUT茶壺打光

 

照之前步驟先打開glut

在修改程式碼

#include <GL/glut.h>

///打光第0步：宣告陣列，裡面有光的屬性值

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, 3.0f, -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 };

 

static void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

 

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

{

    glutInit(&argc, argv);

    glutInitWindowSize(300,300);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

 

    glutCreateWindow("Week05");

    glutDisplayFunc(display);

 

    ///打光需要3D的depth test

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    ///打光1：要開啟光線，原來範例就寫好了

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    ///打光2：要設定光的設定值(前面有陣列，這裡拿來用)

    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);

    ///打光2.2：要把物體也設定好它的matreial

    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;

}

 

改變光源方向

 

 void motion(int x,int y)  ///todo
 {
    GLfloat light_position[] = {2.0f,5.0f,-5.0,0.0f};  ///陣列  放茶壺位置
    light_position[0] = (x-150)/150.0*10;                  ///用motion的x座標，算光的位置
    light_position[1] = -(y-150)/150.0 *10;                ///
    glLightfv(GL_LIGHT0, GL_POSITION , light_position);    /// 用函式 把光設好
    glutPostRedisplay();    ///貼個post請GLUT重畫畫面
}

 

glutMotionFunc(motion); ///要讓光源移動，用motion函式做