week16 內插 攝影機

 1.excel學習內插

放

t:0 0.1 0.2 .... 1

alpha:0 0.1 0.2 ...1

algle:13......90

內插公式alpha*新的+(1-alpha)*舊的

內插實做

攝影機

打開windows/projection

eye是看出去的

center是看的中心

up是攝影機本身旋轉

如果將畫面拉寬他會變胖

調整aspect可調整長寬比

aspect ratio=寬度/高度

#include<GL/glut.h>

void motion(int x,int y)

{

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    gluLookAt((x-150)/15.0,(y-150)/15.0,3,

              0,0,0,

              0,1,0);

    glutPostRedisplay();

}

 void reshape(int w, int h)

{///aspect ratio

    const float ar = (float) w / (float) h;

    glViewport(0, 0, w, h);

    glMatrixMode(GL_PROJECTION);///投影，把3D投影到2D

    glLoadIdentity();

    gluPerspective(60,ar,0.1,100);

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

    ///3D經過轉換到你最後的攝影機

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity() ;

    gluLookAt(0,0,3,0,0,0,0,1,0);

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    //glColor3f(1,1,0);

    glutSolidTeapot(1);

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week16 camera lookat");

glutReshapeFunc(reshape);

glutDisplayFunc(display);

glutMotionFunc(motion);

glutMainLoop();

}