koobas.hobune.stream
Null Reference in UnityStandardAssets.Utility.WaypointProgressTracker.Update
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NullReferenceException: Object reference not set to an instance of an object UnityStandardAssets.Utility.WaypointProgressTracker.Update () (at Assets/Standard Assets/Utility/WaypointProgressTracker.cs:95)
using System;
using UnityEngine;
namespace UnityStandardAssets.Utility
{
public class WaypointProgressTracker : MonoBehaviour
{
// This script can be used with any object that is supposed to follow a
// route marked out by waypoints.
// This script manages the amount to look ahead along the route,
// and keeps track of progress and laps.
[SerializeField] private WaypointCircuit circuit; // A reference to the waypoint-based route we should follow
[SerializeField] private float lookAheadForTargetOffset = 5;
// The offset ahead along the route that the we will aim for
[SerializeField] private float lookAheadForTargetFactor = .1f;
// A multiplier adding distance ahead along the route to aim for, based on current speed
[SerializeField] private float lookAheadForSpeedOffset = 10;
// The offset ahead only the route for speed adjustments (applied as the rotation of the waypoint target transform)
[SerializeField] private float lookAheadForSpeedFactor = .2f;
// A multiplier adding distance ahead along the route for speed adjustments
[SerializeField] private ProgressStyle progressStyle = ProgressStyle.SmoothAlongRoute;
// whether to update the position smoothly along the route (good for curved paths) or just when we reach each waypoint.
[SerializeField] private float pointToPointThreshold = 4;
// proximity to waypoint which must be reached to switch target to next waypoint : only used in PointToPoint mode.
public enum ProgressStyle
{
SmoothAlongRoute,
PointToPoint,
}
// these are public, readable by other objects - i.e. for an AI to know where to head!
public WaypointCircuit.RoutePoint targetPoint { get; private set; }
public WaypointCircuit.RoutePoint speedPoint { get; private set; }
public WaypointCircuit.RoutePoint progressPoint { get; private set; }
public Transform target;
private float progressDistance; // The progress round the route, used in smooth mode.
private int progressNum; // the current waypoint number, used in point-to-point mode.
private Vector3 lastPosition; // Used to calculate current speed (since we may not have a rigidbody component)
public float speed; // current speed of this object (calculated from delta since last frame)
// setup script properties
private void Start()
{
// we use a transform to represent the point to aim for, and the point which
// is considered for upcoming changes-of-speed. This allows this component
// to communicate this information to the AI without requiring further dependencies.
// You can manually create a transform and assign it to this component *and* the AI,
// then this component will update it, and the AI can read it.
if (target == null)
{
target = new GameObject(name + " Waypoint Target").transform;
}
Reset();
}
// reset the object to sensible values
public void Reset()
{
progressDistance = 0;
progressNum = 0;
if (progressStyle == ProgressStyle.PointToPoint)
{
target.position = circuit.Waypoints[progressNum].position;
target.rotation = circuit.Waypoints[progressNum].rotation;
}
}
private void Update()
{
if (progressStyle == ProgressStyle.SmoothAlongRoute)
{
// determine the position we should currently be aiming for
// (this is different to the current progress position, it is a a certain amount ahead along the route)
// we use lerp as a simple way of smoothing out the speed over time.
if (Time.deltaTime > 0)
{
speed = Mathf.Lerp(speed, (lastPosition - transform.position).magnitude/Time.deltaTime,
Time.deltaTime);
}
target.position = circuit.GetRoutePoint(progressDistance + lookAheadForTargetOffset + lookAheadForTargetFactor*speed).position;
target.rotation = Quaternion.LookRotation(circuit.GetRoutePoint(progressDistance + lookAheadForSpeedOffset + lookAheadForSpeedFactor*speed).direction);
// get our current progress along the route
progressPoint = circuit.GetRoutePoint(progressDistance);
Vector3 progressDelta = progressPoint.position - transform.position;
if (Vector3.Dot(progressDelta, progressPoint.direction) < 0)
{
progressDistance += progressDelta.magnitude*0.5f;
}
lastPosition = transform.position;
}
else
{
// point to point mode. Just increase the waypoint if we're close enough:
Vector3 targetDelta = target.position - transform.position;
if (targetDelta.magnitude < pointToPointThreshold)
{
progressNum = (progressNum + 1)%circuit.Waypoints.Length;
}
target.position = circuit.Waypoints[progressNum].position;
target.rotation = circuit.Waypoints[progressNum].rotation;
// get our current progress along the route
progressPoint = circuit.GetRoutePoint(progressDistance);
Vector3 progressDelta = progressPoint.position - transform.position;
if (Vector3.Dot(progressDelta, progressPoint.direction) < 0)
{
progressDistance += progressDelta.magnitude;
}
lastPosition = transform.position;
}
}
private void OnTriggerEnter(Collider other)
{
if (other.tag == "Targets")
Destroy(this.gameObject);
}
//private void OnDrawGizmos()
//{
// if (Application.isPlaying)
// {
// Gizmos.color = Color.green;
// Gizmos.DrawLine(transform.position, target.position);
// Gizmos.DrawWireSphere(circuit.GetRoutePosition(progressDistance), 1);
// Gizmos.color = Color.yellow;
// Gizmos.DrawLine(target.position, target.position + target.forward);
// }
//}
}
}
