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HingeJoint-based rope building component
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| using UnityEngine; | |
| #if UNITY_EDITOR | |
| using UnityEditor; | |
| #endif | |
| [RequireComponent(typeof(Rigidbody))] | |
| public class Rope : MonoBehaviour | |
| { | |
| public LineRenderer lineRenderer; | |
| public Transform endPoint; | |
| [Range(0.25f, 1f)] | |
| public float jointDistance = 1f; | |
| public float width = 0.05f; | |
| [SerializeField] | |
| private HingeJoint[] hinges; | |
| private Rigidbody startRigidBody; | |
| private Rigidbody endRigidBody; | |
| private HingeJoint endJoint; | |
| private void LateUpdate() | |
| { | |
| UpdateLineRenderer(); | |
| } | |
| public void Rebuild() | |
| { | |
| if (!endPoint) return; | |
| if (!startRigidBody) startRigidBody = GetComponent<Rigidbody>(); | |
| startRigidBody.isKinematic = true; | |
| float length = (transform.position - endPoint.position).magnitude; | |
| int segmentCount = Mathf.RoundToInt(length / jointDistance); | |
| if (hinges != null) | |
| { | |
| for (int i = 0; i < hinges.Length; i++) | |
| { | |
| DestroyImmediate(hinges[i].gameObject); | |
| } | |
| hinges = null; | |
| } | |
| hinges = new HingeJoint[segmentCount]; | |
| Vector3 direction = (endPoint.position - transform.position).normalized; | |
| Vector3 localDirection = transform.TransformDirection(direction); | |
| for (int i = 0; i < hinges.Length; i++) | |
| { | |
| GameObject hingeObj = new GameObject("Hinge_" + i); | |
| hingeObj.transform.up = direction; | |
| hingeObj.transform.parent = this.transform; | |
| hingeObj.transform.localPosition = localDirection * (i * jointDistance); | |
| HingeJoint joint = hingeObj.AddComponent<HingeJoint>(); | |
| CapsuleCollider collider = joint.gameObject.AddComponent<CapsuleCollider>(); | |
| collider.radius = width; | |
| collider.center = new Vector3(0f, jointDistance * 0.5f, 0f); | |
| collider.height = jointDistance; | |
| if (i == 0) joint.connectedBody = startRigidBody; | |
| if (i > 0) joint.connectedBody = hinges[i - 1].GetComponent<Rigidbody>(); | |
| hinges[i] = joint; | |
| } | |
| if (endJoint == null) endJoint = endPoint.GetComponent<HingeJoint>(); | |
| if (endJoint == null) endJoint = endPoint.gameObject.AddComponent<HingeJoint>(); | |
| if (endRigidBody == null) endRigidBody = endPoint.GetComponent<Rigidbody>(); | |
| endJoint.connectedBody = hinges[hinges.Length - 1].GetComponent<Rigidbody>(); | |
| RebuildLineRenderer(); | |
| } | |
| private void UpdateLineRenderer() | |
| { | |
| if (!lineRenderer) return; | |
| for (int i = 0; i < hinges.Length; i++) | |
| { | |
| lineRenderer.SetPosition(i, hinges[i].transform.position); | |
| } | |
| lineRenderer.SetPosition(lineRenderer.positionCount-1, endPoint.position); | |
| } | |
| private void RebuildLineRenderer() | |
| { | |
| if (!lineRenderer) return; | |
| lineRenderer.positionCount = hinges.Length+1; | |
| lineRenderer.useWorldSpace = true; | |
| lineRenderer.widthMultiplier = width*2f; | |
| for (int i = 0; i < hinges.Length; i++) | |
| { | |
| lineRenderer.SetPosition(i, hinges[i].transform.position); | |
| } | |
| lineRenderer.SetPosition(lineRenderer.positionCount-1, endPoint.position); | |
| } | |
| } | |
| #if UNITY_EDITOR | |
| [CustomEditor(typeof(Rope))] | |
| public class RopeBuilderInspector : Editor | |
| { | |
| private Rope script; | |
| private void OnEnable() | |
| { | |
| script = (Rope)target; | |
| } | |
| public override void OnInspectorGUI() | |
| { | |
| EditorGUI.BeginChangeCheck(); | |
| base.OnInspectorGUI(); | |
| //Can't destroy objects in OnValidate, so do it here | |
| if (EditorGUI.EndChangeCheck()) | |
| { | |
| script.Rebuild(); | |
| } | |
| } | |
| } | |
| #endif |
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