Week05---Light Material

W05-01---幫茶壺打光

開啟Light Material

看看打光的程式碼

 修改原本程式碼

改變光源的位置

Ambint/Dffusse/Specular意思

加入motion函式

~~程式碼~~

#include <GL/glut.h>

///打光的第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, 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 */

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void motion(int x,int y)

{///TODO:我們想讓光源動,用motion做

    GLfloat light_position[] = {2.0f , 5.0f , -5.0f , 0.0f};///TODO:陣列,放位置

    light_position[0] = (x-150) / 150.0 * 10;///TODO:用moition的x座標,算光的位置

    light_position[1] = -(y-150) / 150.0 * 10;

    glLightfv(GL_LIGHT0,GL_POSITION,light_position);///TODO:用函式,把光設好

    glutPostRedisplay();///TODO:貼個post請glut重畫畫面

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);///TODO:要讓光源動,用motion函式

    ///打光也需要Depth test

    glEnable(GL_DEPTH_TEST);

    ///打光1:要開啟光線

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    ///打光2-1:光LIGHT的設定值(裡面有陣列)

    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:把物體MATERIAL也設定好

    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;

}