97 lines
2.9 KiB
C#
97 lines
2.9 KiB
C#
using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace MoreMountains.Tools
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{
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/// <summary>
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/// Prevents fast moving objects from going through colliders by casting a ray backwards after each movement
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/// </summary>
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[AddComponentMenu("More Mountains/Tools/Movement/MMPreventPassingThrough")]
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public class MMPreventPassingThrough : MonoBehaviour
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{
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/// the layer mask to search obstacles on
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public LayerMask ObstaclesLayerMask;
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/// the bounds adjustment variable
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public float SkinWidth = 0.1f;
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protected float _smallestBoundsWidth;
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protected float _adjustedSmallestBoundsWidth;
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protected float _squaredBoundsWidth;
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protected Vector3 _positionLastFrame;
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protected Rigidbody _rigidbody;
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protected Collider _collider;
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protected Vector3 _lastMovement;
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protected float _lastMovementSquared;
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/// <summary>
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/// On Start we initialize our object
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/// </summary>
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protected virtual void Start()
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{
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Initialization ();
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}
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/// <summary>
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/// Grabs the rigidbody and computes the bounds width
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/// </summary>
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protected virtual void Initialization()
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{
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_rigidbody = GetComponent<Rigidbody>();
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_positionLastFrame = _rigidbody.position;
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_collider = GetComponent<Collider>();
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_smallestBoundsWidth = Mathf.Min(Mathf.Min(_collider.bounds.extents.x, _collider.bounds.extents.y), _collider.bounds.extents.z);
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_adjustedSmallestBoundsWidth = _smallestBoundsWidth * (1.0f - SkinWidth);
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_squaredBoundsWidth = _smallestBoundsWidth * _smallestBoundsWidth;
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}
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/// <summary>
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/// On Enable, we initialize our last frame position
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/// </summary>
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protected virtual void OnEnable()
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{
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_positionLastFrame = this.transform.position;
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}
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/// <summary>
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/// On fixedUpdate, checks the last movement and if needed casts a ray to detect obstacles
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/// </summary>
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protected virtual void FixedUpdate()
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{
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_lastMovement = _rigidbody.position - _positionLastFrame;
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_lastMovementSquared = _lastMovement.sqrMagnitude;
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// if we've moved further than our bounds, we may have missed something
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if (_lastMovementSquared > _squaredBoundsWidth)
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{
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float movementMagnitude = Mathf.Sqrt(_lastMovementSquared);
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// we cast a ray backwards to see if we should have hit something
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RaycastHit hitInfo;
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if (Physics.Raycast(_positionLastFrame, _lastMovement, out hitInfo, movementMagnitude, ObstaclesLayerMask.value))
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{
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if (!hitInfo.collider)
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{
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return;
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}
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if (hitInfo.collider.isTrigger)
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{
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hitInfo.collider.SendMessage("OnTriggerEnter", _collider);
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}
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if (!hitInfo.collider.isTrigger)
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{
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_rigidbody.position = hitInfo.point - (_lastMovement / movementMagnitude) * _adjustedSmallestBoundsWidth;
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}
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}
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}
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_positionLastFrame = _rigidbody.position;
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}
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}
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}
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