void Update()
{
// Eliminates expired displayPoints
for (int i = displayCnt - 1; i >= 0; i--)
{
DisplayPoint point = displayPoints[i];
if (point == null || point.age > lifeTime)
{
displayPoints[i] = null;
displayCnt--;
}
}
// Create a new control point using object's current position if the distance in between object and the last control point is greater than minControlPtnDistance
if ((controlPoints[0] - transform.position).magnitude > minControlPtnDistance)
{
for (int j = 3; j > 0; j--)
{
controlPoints[j] = controlPoints[j - 1];
}
controlPoints[0] = transform.position;
controlCnt++;
// Camule-Spline need excatly 4 control points in order to generate display points
if (controlCnt < 3)
{
return;
}
AddNewDisplayPoints();
}
RenderTrail();
}
/// <summary>
/// Calculate new control displayPoints based on input and generate display points based on control points
/// </summary>
private void AddNewDisplayPoints()
{
int j = displayCnt + 3;
// We can have as most 400 display points as the size of displayPoints array is 400
if (displayCnt + 3 > 399)
{
j = 399;
}
displayCnt = j;
// Free up spaces for new display points
for (; j > 2; j--)
{
displayPoints[j] = displayPoints[j - 3];
}
// Generating display points in between 4 control points
displayPoints[2] = new DisplayPoint(CRSpline(0.33f, controlPoints[3], controlPoints[2], controlPoints[1], controlPoints[0]));
displayPoints[1] = new DisplayPoint(CRSpline(0.66f, controlPoints[3], controlPoints[2], controlPoints[1], controlPoints[0]));
displayPoints[0] = new DisplayPoint(CRSpline(1f, controlPoints[3], controlPoints[2], controlPoints[1], controlPoints[0]));
}
