WEEK16 天氣晴

1. alpha 內插公式: 0.0 ~ 1.0

➡ angle=alpha*新角度+(1-alpha)*舊角度

利用excel來練習

2-1.複製上週 week15-angle-TRT-again 程式碼 

檔名: week16-interpolation

改善按r之後動作不連續的狀況，利用alpha內插法

程式碼:

4.改視角，aspect ratio：長寬比（寬:長）

#include <GL/glut.h>

void reshape(int w,int h)

{///不能用整數除，長寬比（寬/長）

    float ar = (float)w / (float)h;

    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);///3D變2D

    glLoadIdentity();

    gluPerspective(60,ar,0.1,100);

    glMatrixMode(GL_MODELVIEW);///3D Model+View

    glLoadIdentity();

    gluLookAt(0,0,3, ///eye位置

              0,0,0, ///center看哪裡

              0,1,0);///up向量

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(1);

    glutSwapBuffers();

}

void motion(int x,int y)

{

    glMatrixMode(GL_MODELVIEW);///3D Model+View

    glLoadIdentity();

    gluLookAt((x-150)/150.0,(y-150)/150.0,3, ///eye位置

              0,0,0, ///center看哪裡

              0,1,0);///up向量

    glutPostRedisplay();

}///根據滑鼠移動轉換視角

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week16 camera");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutReshapeFunc(reshape);///初始視角

    glutMainLoop();

}