//Display the trajectory path with a line renderer
void DrawTrajectoryPath()
{
//How long did it take to hit the target?
float timeToHitTarget = CalculateTimeToHitTarget();
//How many segments we will have
int maxIndex = Mathf.RoundToInt(timeToHitTarget / h);
lineRenderer.SetVertexCount(maxIndex);
//Start values
Vector3 currentVelocity = gunObj.transform.forward * bulletSpeed;
Vector3 currentPosition = gunObj.transform.position;
Vector3 newPosition = Vector3.zero;
Vector3 newVelocity = Vector3.zero;
//Build the trajectory line
for (int index = 0; index < maxIndex; index++)
{
lineRenderer.SetPosition(index, currentPosition);
//Calculate the new position of the bullet
TutorialBallistics.CurrentIntegrationMethod(h, currentPosition, currentVelocity, out newPosition, out newVelocity);
currentPosition = newPosition;
currentVelocity = newVelocity;
}
}
//How long did it take to reach the target (splash in artillery terms)?
public float CalculateTimeToHitTarget()
{
//Init values
Vector3 currentVelocity = gunObj.transform.forward * bulletSpeed;
Vector3 currentPosition = gunObj.transform.position;
Vector3 newPosition = Vector3.zero;
Vector3 newVelocity = Vector3.zero;
//The total time it will take before we hit the target
float time = 0f;
//Limit to 30 seconds to avoid infinite loop if we never reach the target
for (time = 0f; time < 30f; time += h)
{
TutorialBallistics.CurrentIntegrationMethod(h, currentPosition, currentVelocity, out newPosition, out newVelocity);
//If we are moving downwards and are below the target, then we have hit
if (newPosition.y < currentPosition.y && newPosition.y < targetObj.position.y)
{
//Add 2 times to make sure we end up below the target when we display the path
time += h * 2f;
break;
}
currentPosition = newPosition;
currentVelocity = newVelocity;
}
return(time);
}
void MoveBullet()
{
//Use an integration method to calculate the new position of the bullet
float h = Time.fixedDeltaTime;
TutorialBallistics.CurrentIntegrationMethod(h, currentPosition, currentVelocity, out newPosition, out newVelocity);
//First we need these coordinates to check if we have hit something
CheckHit();
currentPosition = newPosition;
currentVelocity = newVelocity;
//Add the new position to the bullet
transform.position = currentPosition;
}
