Felix/Seminar_Cable_Joints_Unity
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automatically find starting points of cables

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Felix Klenner 2023-12-01 18:18:34 +01:00
parent 0f4911a96e
commit cd25f31a77
3 changed files with 17 additions and 13 deletions
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6
Assets/CableJointsAlgorithm.cs
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@ -5,13 +5,13 @@ using static System.Math;
/** Cable Joints algorithm based on Paper by Matthias Müller, Nuttapong Chentanez, Stefan Jeschke and Miles Macklin*/ /** Cable Joints algorithm based on Paper by Matthias Müller, Nuttapong Chentanez, Stefan Jeschke and Miles Macklin*/
public static class CableJointsAlgorithm { public static class CableJointsAlgorithm {
public static void TimeStep(List<Cable> cables) { public static void TimeStep(List<GameObject> cableStartingPoints) {
//handle each cable individually //handle each cable individually
foreach (var cable in cables) { foreach (var cable in cableStartingPoints) {
float totalDist = 0; float totalDist = 0;
//calculate new attachment points for all joints //calculate new attachment points for all joints
for (var go = cable.firstRoller; go != null; go = go.GetComponent<RollerProperties>().linkTo) { for (var go = cable; go != null; go = go.GetComponent<RollerProperties>().linkTo) {
if (go.GetComponent<RollerProperties>().linkTo != null) { if (go.GetComponent<RollerProperties>().linkTo != null) {
var dist = go.GetComponent<DistanceJoint2D>(); var dist = go.GetComponent<DistanceJoint2D>();
var rp = go.GetComponent<RollerProperties>(); var rp = go.GetComponent<RollerProperties>();

22
Assets/Controller.cs
View file

@ -3,7 +3,7 @@ using TMPro;
using UnityEngine; using UnityEngine;
public class Controller : MonoBehaviour { public class Controller : MonoBehaviour {
private List<Cable> cables = new(); private List<GameObject> cableStartingPoints = new();
//Initialize //Initialize
void Awake() { void Awake() {
@ -36,7 +36,13 @@ public class Controller : MonoBehaviour {
//collisions and physics //collisions and physics
Rigidbody2D rb = go.GetOrAddComponent<Rigidbody2D>(); Rigidbody2D rb = go.GetOrAddComponent<Rigidbody2D>();
rb.useAutoMass = true; // mass is based on size // mass is based on area, if not provided
if (rp.mass == null) {
rb.useAutoMass = rp.mass == null;
}
else {
rb.mass = rp.mass.Value;
}
rb.angularDrag = 1; rb.angularDrag = 1;
rb.drag = 1; rb.drag = 1;
if (rp.movement == RollerProperties.RotationType.Fixed) { if (rp.movement == RollerProperties.RotationType.Fixed) {
@ -45,8 +51,10 @@ public class Controller : MonoBehaviour {
go.AddComponent<PolygonCollider2D>(); go.AddComponent<PolygonCollider2D>();
if (rp.start) { //build list of cable starting objects
cables.Add(new Cable { firstRoller = go }); cableStartingPoints.Add(go);
if (rp.linkTo != null) {
cableStartingPoints.Remove(rp.linkTo);
} }
Debug.Log("Initialized roller: " + go.name); Debug.Log("Initialized roller: " + go.name);
@ -129,12 +137,8 @@ public class Controller : MonoBehaviour {
} }
if (waitedFrames++ > -1) { if (waitedFrames++ > -1) {
CableJointsAlgorithm.TimeStep(cables); CableJointsAlgorithm.TimeStep(cableStartingPoints);
waitedFrames = 0; waitedFrames = 0;
} }
} }
} }
public class Cable {
public GameObject firstRoller;
}

2
Assets/RollerProperties.cs
View file

@ -5,12 +5,12 @@ using UnityEngine.Serialization;
[System.Serializable] [System.Serializable]
public class RollerProperties : MonoBehaviour { public class RollerProperties : MonoBehaviour {
//settings //settings
[SerializeField] public bool start = false;
[SerializeField] public bool clockwise = false; [SerializeField] public bool clockwise = false;
[SerializeField] public GameObject linkTo = null; [SerializeField] public GameObject linkTo = null;
[SerializeField] public RotationType movement = RotationType.Fixed; [SerializeField] public RotationType movement = RotationType.Fixed;
[FormerlySerializedAs("fixedAttachmentPoint")] [SerializeField] public bool useFixedAttachmentPoint = false; [FormerlySerializedAs("fixedAttachmentPoint")] [SerializeField] public bool useFixedAttachmentPoint = false;
[SerializeField] public Vector2 attachmentPoint = new Vector2(0, 0); [SerializeField] public Vector2 attachmentPoint = new Vector2(0, 0);
[SerializeField] public float? mass = null;
//references //references
protected internal GameObject text; protected internal GameObject text;