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August 31, 2024 16:14
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Smooth Follow Spline Auto Dolly for Cinemachine 3.1.1 Example
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| using System; | |
| using Unity.Cinemachine; | |
| using UnityEngine; | |
| using UnityEngine.Splines; | |
| [Serializable] | |
| public class SmoothFollow : SplineAutoDolly.ISplineAutoDolly { | |
| [Tooltip("Maximum speed of the dolly along the spline.")] | |
| public float MaxSpeed = 0.5f; | |
| [Tooltip("How quickly the dolly reacts to the target's movement.")] | |
| public float SmoothTime = 2f; | |
| [Tooltip("Look-ahead distance to predict target's future position.")] | |
| public float LookAheadDistance = 2f; | |
| [Tooltip("Distance tolerance to the target before stopping.")] | |
| public float StoppingDistance = 0.1f; | |
| private float currentVelocity; | |
| void SplineAutoDolly.ISplineAutoDolly.Validate() { | |
| MaxSpeed = Mathf.Max(0, MaxSpeed); | |
| SmoothTime = Mathf.Max(0.01f, SmoothTime); | |
| LookAheadDistance = Mathf.Max(0, LookAheadDistance); | |
| StoppingDistance = Mathf.Max(0, StoppingDistance); | |
| } | |
| void SplineAutoDolly.ISplineAutoDolly.Reset() { | |
| currentVelocity = 0; | |
| } | |
| bool SplineAutoDolly.ISplineAutoDolly.RequiresTrackingTarget => true; | |
| float SplineAutoDolly.ISplineAutoDolly.GetSplinePosition( | |
| MonoBehaviour sender, Transform target, SplineContainer spline, | |
| float currentPosition, PathIndexUnit positionUnits, float deltaTime) | |
| { | |
| if (target == null || deltaTime <= 0) return currentPosition; | |
| // Predict the target's future position based on LookAheadDistance | |
| Vector3 targetPosition = target.position + target.forward * LookAheadDistance; | |
| Vector3 localTargetPos = spline.transform.InverseTransformPoint(targetPosition); | |
| // Find the nearest point on the spline to the predicted target position | |
| SplineUtility.GetNearestPoint(spline.Spline, localTargetPos, out _, out var normalizedPos, 10, 3); | |
| normalizedPos = Mathf.Clamp01(normalizedPos); | |
| float targetPositionOnSpline = spline.Spline.ConvertIndexUnit(normalizedPos, PathIndexUnit.Normalized, positionUnits); | |
| // Compute the distance between the current and target positions | |
| float distanceToTarget = Mathf.Abs(targetPositionOnSpline - currentPosition); | |
| // Check if within the stopping distance | |
| if (distanceToTarget < StoppingDistance) return currentPosition; | |
| // Smoothly interpolate to the target position | |
| return Mathf.SmoothDamp(currentPosition, targetPositionOnSpline, ref currentVelocity, SmoothTime, MaxSpeed, deltaTime); | |
| } | |
| } |
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