Unity中作2D藤曼生长效果

参考：https://github.com/dci05049/Verlet-Rope-Unity
使用插件：Dotween

绳子代码修改:

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;public class RopeBridge : MonoBehaviour
{public Transform StartPoint;public Transform EndPoint;private LineRenderer lineRenderer;public List<RopeSegment> ropeSegments = new List<RopeSegment>();public float ropeSegLen = 0.25f;public int segmentLength = 35;public float startWidth = 0.1f;public float endWidth = 0.1f;// Use this for initializationvoid Start(){this.lineRenderer = this.GetComponent<LineRenderer>();Vector3 ropeStartPoint = StartPoint.position;for (int i = 0; i < segmentLength; i++){this.ropeSegments.Add(new RopeSegment(ropeStartPoint));ropeStartPoint.y -= ropeSegLen;}}// Update is called once per framevoid Update(){this.DrawRope();}private void FixedUpdate(){this.Simulate();}private void Simulate(){// SIMULATIONVector2 forceGravity = new Vector2(0f, -1f);for (int i = 1; i < this.segmentLength; i++){RopeSegment firstSegment = this.ropeSegments[i];Vector2 velocity = firstSegment.posNow - firstSegment.posOld;firstSegment.posOld = firstSegment.posNow;firstSegment.posNow += velocity;firstSegment.posNow += forceGravity * Time.fixedDeltaTime;this.ropeSegments[i] = firstSegment;}//CONSTRAINTSfor (int i = 0; i < 50; i++){this.ApplyConstraint();}}private void ApplyConstraint(){//Constrant to First Point RopeSegment firstSegment = this.ropeSegments[0];firstSegment.posNow = this.StartPoint.position;this.ropeSegments[0] = firstSegment;//Constrant to Second Point RopeSegment endSegment = this.ropeSegments[this.ropeSegments.Count - 1];endSegment.posNow = this.EndPoint.position;this.ropeSegments[this.ropeSegments.Count - 1] = endSegment;for (int i = 0; i < this.segmentLength - 1; i++){RopeSegment firstSeg = this.ropeSegments[i];RopeSegment secondSeg = this.ropeSegments[i + 1];float dist = (firstSeg.posNow - secondSeg.posNow).magnitude;float error = Mathf.Abs(dist - this.ropeSegLen);Vector2 changeDir = Vector2.zero;if (dist > ropeSegLen){changeDir = (firstSeg.posNow - secondSeg.posNow).normalized;}else if (dist < ropeSegLen){changeDir = (secondSeg.posNow - firstSeg.posNow).normalized;}Vector2 changeAmount = changeDir * error;if (i != 0){firstSeg.posNow -= changeAmount * 0.5f;this.ropeSegments[i] = firstSeg;secondSeg.posNow += changeAmount * 0.5f;this.ropeSegments[i + 1] = secondSeg;}else{secondSeg.posNow += changeAmount;this.ropeSegments[i + 1] = secondSeg;}}}private void DrawRope(){lineRenderer.startWidth = this.startWidth;lineRenderer.endWidth = this.endWidth;Vector3[] ropePositions = new Vector3[this.segmentLength];for (int i = 0; i < this.segmentLength; i++){ropePositions[i] = this.ropeSegments[i].posNow;}lineRenderer.positionCount = ropePositions.Length;lineRenderer.SetPositions(ropePositions);}public struct RopeSegment{public Vector2 posNow;public Vector2 posOld;public RopeSegment(Vector2 pos){this.posNow = pos;this.posOld = pos;}}void OnDrawGizmos(){DrawBGLine();}private void DrawBGLine(){#if UNITY_EDITORGizmos.color = Color.green;Gizmos.DrawLine(StartPoint.position, EndPoint.position);#endif}
}

动画代码:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using System;
using UnityEngine.Events;public class RopeAnim:MonoBehaviour
{Transform parent;RopeBridge ropeBridge;Vector3 target;Tween tween;public float percent = 0.5f;public UnityEvent OnAnimEnd;public float duration=10;// Start is called before the first frame updatevoid Start(){ropeBridge = GetComponent<RopeBridge>();target = ropeBridge.EndPoint.position;ropeBridge.EndPoint.position = ropeBridge.StartPoint.position;parent = transform.parent;startWidth = ropeBridge.startWidth;endwidth = ropeBridge.endWidth;InitAnim();}float startWidth = 0;float endwidth = 0;public void InitAnim(){ropeBridge.EndPoint.position = ropeBridge.StartPoint.position;ropeBridge.startWidth = 0f;ropeBridge.endWidth = 0f;if (parent == null){for (int i = 0; i < transform.childCount; i++) {RopeAnim childAnim = transform.GetChild(i).GetComponent<RopeAnim>();if (childAnim != null) {childAnim.InitAnim();}}}}// Update is called once per framevoid Update(){}public void Play(){//ropeBridge.lineWidth = 0.1f;ropeBridge.startWidth = startWidth;ropeBridge.endWidth = endwidth;ropeBridge.ropeSegLen = 0.01f;tween =ropeBridge.EndPoint.DOMove(target, duration).OnComplete(OnComplete).OnUpdate(OnUpdate);}private void OnUpdate(){if (parent != null){if (parent.GetComponent<RopeBridge>()){RopeBridge parentBridge = parent.GetComponent<RopeBridge>();int NodePoint = (int)(parentBridge.segmentLength * percent);if (NodePoint > parentBridge.segmentLength - 1){NodePoint = parentBridge.segmentLength - 1;}if (NodePoint < 0){NodePoint = 0;}ropeBridge.StartPoint.position = parentBridge.ropeSegments[NodePoint].posNow;}}}private void OnComplete(){if (OnAnimEnd != null){OnAnimEnd.Invoke();}if (parent != null) {ropeBridge.ropeSegLen = 0.05f;ropeBridge.EndPoint.DOShakePosition(1, 0.2f, 5, 10).SetLoops(-1).OnUpdate(OnUpdate);}}public void Stop(){tween.Pause();}
}

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