week 14 JN

(1) 作業四 Q&A

(2) 主題: 攝影機、投影矩陣

(3) 實作:gluLookAt() glutReshapeFunc()

(4) 期末作品

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目標1:
到jsyeh.org/3dcg10下載windows, data, glut32
接著開啟


使用此程式碼來控制攝影機
gluLookAt(eyeX,eyeY,eyeZ,centerX,centerY,centerZ,upX,upY,upZ);
gluPerspective(fovy,aspect,zNear,zFar)
fovy:張開的角度 Field of View , in  Y direction
aspect:寬長比例,設對你的畫面的東西才會正確
zNear:近的裁一刀
zFar:遠的裁一刀
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接下來去看glutReshapeFunc(resize); ///當視窗調大小時,你要改變投影的設定值,才不會變胖

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試著寫寫看
GLUT專案

tatic void resize(int width, int height)

{

    const float ar = (float) width / (float) height;

    glViewport(0, 0, width, height);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity() ;

    gluLookAt(0,3,3, 0,0,0, 0,1,0);

}

gluLookAt(0,3,3, 0,0,0, 0,1,0);