using PigeonCoopToolkit.Utillities;
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using UnityEngine;
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namespace PigeonCoopToolkit.Effects.Trails
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{
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[AddComponentMenu("Pigeon Coop Toolkit/Effects/Smooth Trail")]
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public class SmoothTrail : TrailRenderer_Base
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{
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public float MinControlPointDistance = 0.1f;
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public int MaxControlPoints = 15;
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public int PointsBetweenControlPoints = 4;
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private Vector3 _lastPosition;
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private float _distanceMoved;
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private CircularBuffer<ControlPoint> _controlPoints;
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private class ControlPoint
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{
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public Vector3 p;
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public Vector3 forward;
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}
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protected override void Start()
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{
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base.Start();
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_lastPosition = _t.position;
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}
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protected override void Update()
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{
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if (_emit)
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{
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_distanceMoved += Vector3.Distance(_t.position, _lastPosition);
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if (!Mathf.Approximately(_distanceMoved, 0) && _distanceMoved >= MinControlPointDistance)
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{
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AddControlPoint(_t.position);
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_distanceMoved = 0;
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}
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else
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{
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_controlPoints[_controlPoints.Count - 1].p = _t.position;
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if (TrailData.UseForwardOverride)
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{
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_controlPoints[_controlPoints.Count - 1].forward = TrailData.ForwardOverrideRelative
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? _t.TransformDirection(TrailData.ForwardOverride.normalized)
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: TrailData.ForwardOverride.normalized;
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}
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}
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_lastPosition = _t.position;
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}
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base.Update();
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}
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protected override void OnStartEmit()
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{
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_lastPosition = _t.position;
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_distanceMoved = 0;
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_controlPoints = new CircularBuffer<ControlPoint>(MaxControlPoints);
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_controlPoints.Add(new ControlPoint { p = _lastPosition });
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if (TrailData.UseForwardOverride)
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{
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_controlPoints[0].forward = TrailData.ForwardOverrideRelative
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? _t.TransformDirection(TrailData.ForwardOverride.normalized)
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: TrailData.ForwardOverride.normalized;
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}
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AddPoint(new PCTrailPoint(), _lastPosition);
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AddControlPoint(_lastPosition);
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}
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protected override void UpdateTrail(PCTrail trail, float deltaTime)
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{
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if (trail.IsActiveTrail == false)
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return;
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//TODO Must optimize this further, I don't need to keep recalculating point positions unless we are
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//dealng with the points between the last and 2nd last CP (+ the last CP itself)
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int trailPointIndex = 0;
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for (int i = 0; i < _controlPoints.Count; i++)
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{
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trail.Points[trailPointIndex].Position = _controlPoints[i].p;
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if (TrailData.UseForwardOverride)
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{
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trail.Points[trailPointIndex].Forward = _controlPoints[i].forward;
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}
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trailPointIndex++;
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if (i < _controlPoints.Count - 1)
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{
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Vector3 Handle1, Handle2;
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float distanceBetween = Vector3.Distance(_controlPoints[i].p, _controlPoints[i + 1].p) / 2;
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if (i == 0)
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{
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Handle1 = _controlPoints[i].p + (_controlPoints[i + 1].p - _controlPoints[i].p).normalized * distanceBetween;
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}
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else
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{
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Handle1 = _controlPoints[i].p + (_controlPoints[i + 1].p - _controlPoints[i - 1].p).normalized * distanceBetween;
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}
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int nextI = i + 1;
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if (nextI == _controlPoints.Count - 1)
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{
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Handle2 = _controlPoints[nextI].p + (_controlPoints[nextI - 1].p - _controlPoints[nextI].p).normalized * distanceBetween;
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}
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else
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{
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Handle2 = _controlPoints[nextI].p + (_controlPoints[nextI - 1].p - _controlPoints[nextI + 1].p).normalized * distanceBetween;
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}
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PCTrailPoint currentHandle = trail.Points[trailPointIndex-1];
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PCTrailPoint nextHandle = trail.Points[(trailPointIndex-1) + PointsBetweenControlPoints+1];
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for (int pointBetween = 0; pointBetween < PointsBetweenControlPoints; pointBetween++)
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{
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float t= (((float)pointBetween + 1f) / ((float)PointsBetweenControlPoints + 1f));
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trail.Points[trailPointIndex].Position = GetPointAlongCurve(_controlPoints[i].p, Handle1, _controlPoints[i + 1].p, Handle2, t, 0.3f);
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trail.Points[trailPointIndex].SetTimeActive(Mathf.Lerp(currentHandle.TimeActive(), nextHandle.TimeActive(), t));
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if (TrailData.UseForwardOverride)
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{
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trail.Points[trailPointIndex].Forward = Vector3.Lerp(currentHandle.Forward, nextHandle.Forward, t);
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}
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trailPointIndex++;
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}
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}
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}
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int lastControlPointPointIndex = ((_controlPoints.Count - 1) + ((_controlPoints.Count - 1) * PointsBetweenControlPoints));
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int prevControlPointPointIndex = lastControlPointPointIndex - PointsBetweenControlPoints - 1;
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int activePointCount = lastControlPointPointIndex + 1;
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float distanceFromStart = trail.Points[prevControlPointPointIndex].GetDistanceFromStart();
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for (int i = prevControlPointPointIndex + 1; i < activePointCount; i++)
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{
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distanceFromStart += Vector3.Distance(trail.Points[i - 1].Position, trail.Points[i].Position);
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trail.Points[i].SetDistanceFromStart(distanceFromStart);
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}
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}
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protected override void Reset()
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{
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base.Reset();
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MinControlPointDistance = 0.1f;
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MaxControlPoints = 15;
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PointsBetweenControlPoints = 4;
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}
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protected override void OnTranslate(Vector3 t)
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{
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_lastPosition += t;
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for (int i = 0; i < _controlPoints.Count; i++)
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_controlPoints[i].p += t;
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}
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private void AddControlPoint(Vector3 position)
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{
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for (int i = 0; i < PointsBetweenControlPoints; i++)
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{
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AddPoint(new PCTrailPoint(), position);
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}
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AddPoint(new PCTrailPoint(), position);
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ControlPoint newCP = new ControlPoint { p = position };
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if (TrailData.UseForwardOverride)
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{
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newCP.forward = TrailData.ForwardOverrideRelative
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? _t.TransformDirection(TrailData.ForwardOverride.normalized)
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: TrailData.ForwardOverride.normalized;
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}
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_controlPoints.Add(newCP);
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}
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protected override int GetMaxNumberOfPoints()
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{
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return ((MaxControlPoints) + ((MaxControlPoints) * PointsBetweenControlPoints));
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}
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public Vector3 GetPointAlongCurve(Vector3 curveStart, Vector3 curveStartHandle, Vector3 curveEnd, Vector3 curveEndHandle, float t, float crease)
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{
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float oneMinT = 1 - t;
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float oneMinTPow3 = Mathf.Pow(oneMinT, 3);
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float oneMinTPow2 = Mathf.Pow(oneMinT, 2);
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float oneMinCrease = 1 - crease;
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return ((oneMinTPow3 * curveStart * oneMinCrease) + (3 * oneMinTPow2 * t * curveStartHandle * crease) + (3 * oneMinT * Mathf.Pow(t, 2) * curveEndHandle * crease) +
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(Mathf.Pow(t, 3) * curveEnd * oneMinCrease))
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/
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((oneMinTPow3 * oneMinCrease) + (3 * oneMinTPow2 * t * crease) + (3 * oneMinT * Mathf.Pow(t, 2) * crease) +
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(Mathf.Pow(t, 3) * oneMinCrease));
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}
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}
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}
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