1.If you first consider the modeling of the scene, you'll need a cannon that can fire the cannonball.
如果你首先考慮場景建模,您需要一個(gè)可以發(fā)射炮彈的火炮。
2.Look at picture of cannonball flight and you will see they will describe it like this, as though at the end of the flight its dropping almost vertically.