AAA的圖學筆記

 電腦圖學 Week16 2022-06-07

1. 主題: 內插、動作內插
2. 主題: 攝影機、運鏡 
3. 實作: gluLookAt()

#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();
	}