Convert ModuleRestockLookAtConstrain into ModuleRestockConstraints

New module is extendable and modular, allowing constraints to be run in the expected order without relying on possibly undefined behavior

Source/Restock/Constraints/CopyPositionConstraint.cs

@@ -0,0 +1,40 @@
+using UnityEngine;
+
+namespace Restock.Constraints
+{
+    [System.Serializable]
+    public class CopyPositionConstraint : IConstraint
+    {
+        private readonly string moversName;
+        private readonly string targetName;
+        
+        private readonly bool local = false;
+
+        // Cached components
+        private readonly Transform mover;
+        private readonly Transform target;
+        
+        public CopyPositionConstraint(ConfigNode node, Part p)
+        {
+            node.TryGetValue("rotatorsName", ref moversName);
+            node.TryGetValue("targetName", ref targetName);
+            
+            mover = p.FindModelTransform(moversName);
+            target = p.FindModelTransform(targetName);
+        }
+        
+        public void Update()
+        {
+            if (mover == null || target == null) return;
+
+            if (local)
+            {
+                mover.localPosition = target.localPosition;
+            }
+            else
+            {
+                mover.position = target.position;
+            }
+        }
+    }
+}

Source/Restock/Constraints/CopyRotationConstraint.cs

@@ -0,0 +1,40 @@
+using UnityEngine;
+
+namespace Restock.Constraints
+{
+    [System.Serializable]
+    public class CopyRotationConstraint : IConstraint
+    {
+        private readonly string rotatorsName;
+        private readonly string targetName;
+        
+        private readonly bool local = false;
+
+        // Cached components
+        private readonly Transform target;
+        private readonly Transform rotator;
+        
+        public CopyRotationConstraint(ConfigNode node, Part p)
+        {
+            node.TryGetValue("rotatorsName", ref rotatorsName);
+            node.TryGetValue("targetName", ref targetName);
+            
+            rotator = p.FindModelTransform(rotatorsName);
+            target = p.FindModelTransform(targetName);
+        }
+        
+        public void Update()
+        {
+            if (rotator == null || target == null) return;
+
+            if (local)
+            {
+                rotator.localRotation = target.localRotation;
+            }
+            else
+            {
+                rotator.rotation = target.rotation;
+            }
+        }
+    }
+}

Source/Restock/Constraints/IConstraint.cs

@@ -0,0 +1,10 @@
+using System;
+using UnityEngine;
+
+namespace Restock.Constraints
+{
+    public interface IConstraint
+    {
+        void Update();
+    }
+}

Source/Restock/Constraints/LookAtConstraint.cs

@@ -0,0 +1,33 @@
+using UnityEngine;
+
+namespace Restock.Constraints
+{
+    [System.Serializable]
+    public class LookAtConstraint : IConstraint
+    {
+        private readonly string rotatorsName;
+        private readonly string targetName;
+
+        // Cached components
+        private readonly Transform target;
+        private readonly Transform rotator;
+
+        public LookAtConstraint(ConfigNode node, Part p)
+        {
+            node.TryGetValue("rotatorsName", ref rotatorsName);
+            node.TryGetValue("targetName", ref targetName);
+            
+            rotator = p.FindModelTransform(rotatorsName);
+            target = p.FindModelTransform(targetName);
+        }
+        
+        public void Update()
+        {
+            if (rotator == null || target == null) return;
+            
+            var lookPos = target.position - rotator.position;
+            var rotation = Quaternion.LookRotation(lookPos, target.up);
+            rotator.rotation = rotation;
+        }
+    }
+}