102 lines
2.8 KiB
C#
102 lines
2.8 KiB
C#
using UnityEngine;
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namespace KitsuneCafe.Entities
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{
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public class Spring : MonoBehaviour
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{
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[SerializeField]
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private new Rigidbody rigidbody;
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[SerializeField]
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private float rayLength = 1.5f;
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[SerializeField]
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private float rideHeight = 1f;
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[SerializeField]
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private float rideSpringStrength;
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[SerializeField]
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private float rideSpringDamper;
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[SerializeField]
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private Vector3 rayOffset = Vector3.zero;
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[SerializeField]
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private Vector3 down = Vector3.down;
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[SerializeField]
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private LayerMask layerMask;
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private bool didRayHit;
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private Vector3 relativeDown;
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private float relativeVelocity;
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private float targetDistance;
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private float springForce;
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public bool IsSpringColliding => didRayHit;
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private void Reset()
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{
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rigidbody = GetComponent<Rigidbody>();
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layerMask = LayerMask.NameToLayer("Default");
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}
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private void FixedUpdate()
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{
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relativeDown = transform.TransformDirection(this.down);
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didRayHit = Raycast(relativeDown, out var hit);
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if (didRayHit)
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{
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relativeVelocity = RelativeVelocity(down, rigidbody, hit.rigidbody);
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targetDistance = hit.distance - rideHeight;
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springForce = (targetDistance * rideSpringStrength) - (relativeVelocity * rideSpringDamper);
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rigidbody.AddForce(relativeDown * springForce);
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}
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}
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private bool Raycast(Vector3 direction, out RaycastHit hit)
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{
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return Physics.Raycast(
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transform.position + rayOffset,
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direction,
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out hit,
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rayLength,
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layerMask
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);
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}
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private static float RelativeVelocity(Vector3 direction, Rigidbody a, Rigidbody b)
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{
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var aVelocity = GetVelocity(a);
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var bVelocity = GetVelocity(b);
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var aDirVelocity = Vector3.Dot(direction, aVelocity);
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var bDirVelocity = Vector3.Dot(direction, bVelocity);
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return aDirVelocity - bDirVelocity;
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}
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private static Vector3 GetVelocity(Rigidbody rb)
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{
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return rb == null ? Vector3.zero : rb.linearVelocity;
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}
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private void OnDrawGizmos()
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{
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var origin = transform.position + rayOffset;
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Gizmos.color = didRayHit ? Color.yellow : Color.red;
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Gizmos.DrawRay(origin, relativeDown * rayLength);
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if (didRayHit)
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{
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Gizmos.color = Color.green;
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Gizmos.DrawRay(origin, relativeDown * rideHeight);
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}
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}
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}
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}
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