/// <summary>
/// Draws a prediction of the planet's trajectory
/// </summary>
private void DrawPrediction()
{
float timeStep = PredictionTime / PredictionSteps;
LineRenderer lr = GetComponent <LineRenderer>();
if (lr == null)
{
return;
}
lr.numPositions = PredictionSteps;
// First point is current position
lr.SetPosition(0, transform.position);
// These will hold last prediction's values
Vector3 lastVelocity = Velocity;
Vector3 lastPosition = transform.position;
for (int i = 1; i < PredictionSteps; i++)
{
// Get all the forces
Vector3 forcesThisStep = GetSumForcesApplyingToMe(lastPosition);
// Calculate velocity at given time
Vector3 velocityThisStep = lastVelocity + forcesThisStep * timeStep * i; // (timeStep * i) is the equivalent of Time.deltaTime in the prediction
// Deduce positin
Vector3 positionThisStep = lastPosition + velocityThisStep * timeStep * i;
lr.SetPosition(i, positionThisStep);
// Raycast from last point to new point to check if the prediction is crossing a planet
RaycastHit hitInfo;
Ray rayhit = new Ray(lastPosition, positionThisStep - lastPosition);
Physics.Raycast(rayhit, out hitInfo, Vector3.Distance(positionThisStep, lastPosition) * 2f, 1 << LayerManager.ToInt(LAYER.PLANET), QueryTriggerInteraction.Ignore);
// If we hit something stop drawing the prediction
if (hitInfo.collider != null)
{
lr.numPositions = i + 1;
i = PredictionSteps - 1;
}
lastPosition = positionThisStep;
lastVelocity = velocityThisStep;
}
}