81 lines
3.3 KiB
C#
81 lines
3.3 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("Evade 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("Assets/Behavior Designer Movement/Editor/Icons/{SkinColor}EvadeIcon.png")]
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public class Evade : NavMeshMovement
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{
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[Tooltip("The agent has evaded when the magnitude is greater than this value")]
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public SharedFloat evadeDistance = 10;
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[Tooltip("The distance to look ahead when evading")]
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public SharedFloat lookAheadDistance = 5;
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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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public SharedFloat targetDistPrediction = 20;
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[Tooltip("Multiplier for predicting the look ahead distance")]
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public SharedFloat targetDistPredictionMult = 20;
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[Tooltip("The GameObject that the agent is evading")]
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public SharedGameObject 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 = target.Value.transform.position;
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SetDestination(Target());
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}
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// Evade from the target. Return success once the agent has fleed the target by moving far enough away from it
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// Return running if the agent is still fleeing
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public override TaskStatus OnUpdate()
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{
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if (Vector3.Magnitude(transform.position - target.Value.transform.position) > evadeDistance.Value) {
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return TaskStatus.Success;
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}
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SetDestination(Target());
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return TaskStatus.Running;
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}
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// Evade in the opposite direction
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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 = (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 / targetDistPrediction.Value) {
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futurePrediction = targetDistPrediction.Value;
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} else {
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futurePrediction = (distance / speed) * 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 = target.Value.transform.position;
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var position = targetPosition + (targetPosition - prevTargetPosition) * futurePrediction;
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return transform.position + (transform.position - position).normalized * lookAheadDistance.Value;
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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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evadeDistance = 10;
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lookAheadDistance = 5;
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targetDistPrediction = 20;
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targetDistPredictionMult = 20;
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target = null;
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}
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}
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}
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