77 lines
3.1 KiB
C#
77 lines
3.1 KiB
C#
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using UnityEngine;
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namespace BehaviorDesigner.Runtime.Tasks.Movement
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{
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[TaskDescription("Pursue the target specified using the Unity NavMesh.")]
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[TaskCategory("Movement")]
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[HelpURL("https://www.opsive.com/support/documentation/behavior-designer-movement-pack/")]
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[TaskIcon("e1387dd5098c1f7449253a17b3b39784", "c29eb3ccdfa67a744971276c325e44ea")]
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public class Pursue : NavMeshMovement
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{
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[Tooltip("How far to predict the distance ahead of the target. Lower values indicate less distance should be predicated")]
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[UnityEngine.Serialization.FormerlySerializedAs("targetDistPrediction")]
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public SharedFloat m_TargetDistPrediction = 20;
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[Tooltip("Multiplier for predicting the look ahead distance")]
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[UnityEngine.Serialization.FormerlySerializedAs("targetDistPredictionMult")]
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public SharedFloat m_TargetDistPredictionMult = 20;
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[Tooltip("The GameObject that the agent is pursuing")]
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[UnityEngine.Serialization.FormerlySerializedAs("target")]
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public SharedGameObject m_Target;
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// The position of the target at the last frame
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private Vector3 targetPosition;
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public override void OnStart()
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{
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base.OnStart();
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targetPosition = m_Target.Value.transform.position;
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SetDestination(Target());
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}
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// Pursue the destination. Return success once the agent has reached the destination.
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// Return running if the agent hasn't reached the destination yet
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public override TaskStatus OnUpdate()
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{
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if (HasArrived()) {
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return TaskStatus.Success;
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}
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// Target will return the predicated position
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SetDestination(Target());
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return TaskStatus.Running;
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}
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// Predict the position of the target
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private Vector3 Target()
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{
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// Calculate the current distance to the target and the current speed
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var distance = (m_Target.Value.transform.position - transform.position).magnitude;
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var speed = Velocity().magnitude;
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float futurePrediction = 0;
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// Set the future prediction to max prediction if the speed is too small to give an accurate prediction
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if (speed <= distance / m_TargetDistPrediction.Value) {
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futurePrediction = m_TargetDistPrediction.Value;
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} else {
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futurePrediction = (distance / speed) * m_TargetDistPredictionMult.Value; // the prediction should be accurate enough
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}
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// Predict the future by taking the velocity of the target and multiply it by the future prediction
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var prevTargetPosition = targetPosition;
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targetPosition = m_Target.Value.transform.position;
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return targetPosition + (targetPosition - prevTargetPosition) * futurePrediction;
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}
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// Reset the public variables
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public override void OnReset()
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{
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base.OnReset();
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m_TargetDistPrediction = 20;
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m_TargetDistPredictionMult = 20;
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m_Target = null;
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}
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}
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}
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