chore: initial commit

Assets/Feel/MMTools/Accessories/MMMovement/MMPreventPassingThrough.cs

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