I need Missile simulation and have implemented this function. Now I need draw the trajectory in advance. the conditions include the Missile speed, direction and gravity which all know. According to the "Free fall", horizontal distance is Vh * t; Vertical distance is Vv * t - 0.5 * gravity * t * t. (Vh: horizontal speed; Vv: vertical speed). So I can draw trajectory in advance. But the question is that the end point which I daw and havok physics simulate is different. In other words, the end point that I daw is not the missile really hit piont. What reason is this? How Havok simulate the Missile(I use a RigidBody instead of Missile in Physics)? Whether there are other ways to implement this function?
Thanks in advace.