Fix launch clamp instancing in flight scene

Closes #693

Source/Restock/ModuleRestockLaunchClamp.cs

@@ -5,30 +5,28 @@ namespace Restock
 {
     public class ModuleRestockLaunchClamp : LaunchClamp
     {
-        [KSPField] public string trf_towerGirder_name = "";
-        [KSPField] public string trf_towerYoke_name = "";
-
-        [KSPField] public Transform towerPivot;
-        [KSPField] public Transform towerYoke;
-        [KSPField] public Transform towerAnchor;
-        [KSPField] public Transform towerGirder;
-        [KSPField] public Transform towerStretch;
-        [KSPField] public int maxSegments = 100;
-        
-        private bool _flightUpdate = false;
         private Material _girderMaterial;
+        private Matrix4x4[] _girderMatrices;
         private Mesh _girderMesh;
 
         private int _girderSegments;
-        private Matrix4x4[] _girderMatrices;
+        [KSPField] public int maxSegments = 100;
+        [KSPField] public Transform towerAnchor;
+        [KSPField] public Transform towerGirder;
+
+        [KSPField] public Transform towerPivot;
+        [KSPField] public Transform towerStretch;
+        [KSPField] public Transform towerYoke;
+        [KSPField] public string trf_towerGirder_name = "";
+        [KSPField] public string trf_towerYoke_name = "";
 
         public override void OnLoad(ConfigNode node)
         {
-            towerPivot = base.part.FindModelTransform(trf_towerPivot_name);
-            towerYoke = base.part.FindModelTransform(trf_towerYoke_name);
-            towerAnchor = base.part.FindModelTransform(trf_anchor_name);
-            towerGirder = base.part.FindModelTransform(trf_towerGirder_name);
-            towerStretch = base.part.FindModelTransform(trf_towerStretch_name);
+            towerPivot = part.FindModelTransform(trf_towerPivot_name);
+            towerYoke = part.FindModelTransform(trf_towerYoke_name);
+            towerAnchor = part.FindModelTransform(trf_anchor_name);
+            towerGirder = part.FindModelTransform(trf_towerGirder_name);
+            towerStretch = part.FindModelTransform(trf_towerStretch_name);
 
             base.OnLoad(node);
         }
@@ -42,7 +40,7 @@ namespace Restock
             _girderMesh = towerGirder.GetComponent<MeshFilter>().mesh;
 
             girderRenderer.enabled = false; // we'll render manually from now on
-            
+
             _girderSegments = 0;
             _girderMatrices = new Matrix4x4[maxSegments];
 
@@ -51,41 +49,33 @@ namespace Restock
             {
                 this.LogError("Could not enable instancing! Aborting");
                 _girderSegments = -1;
-                return;
             }
         }
 
         public void LateUpdate()
         {
-            
             if (_girderSegments < 0) return;
 
-            if (!HighLogic.LoadedSceneIsEditor)
-            {
-                if (_flightUpdate) return;
-                else _flightUpdate = true;
-            }
-
-            var height1 = HighLogic.LoadedSceneIsEditor ? towerStretch.position.y : base.height;
-            var initialHeight1 = base.initialHeight;
+            var height = HighLogic.LoadedSceneIsEditor ? towerStretch.position.y : this.height;
+            var initialHeight = this.initialHeight;
 
-            towerAnchor.position = towerStretch.position - (towerStretch.up * height1);
+            towerAnchor.position = towerStretch.position - towerStretch.up * height;
 
             var vec1 = Vector3.down;
             var vec2 = towerAnchor.localPosition - towerYoke.localPosition;
             towerYoke.localRotation = Quaternion.FromToRotation(vec1, vec2);
-            
-            _girderSegments = Mathf.CeilToInt(height1 / base.initialHeight);
+
+            _girderSegments = Mathf.CeilToInt(height / this.initialHeight);
             _girderSegments = Math.Min(_girderSegments, maxSegments);
             _girderSegments = Math.Max(_girderSegments, 0);
-            
+
             var matrix = towerGirder.localToWorldMatrix;
-            var offset = Matrix4x4.Translate(matrix.MultiplyVector(Vector3.down * base.initialHeight));
-            
-            for (int i = 0; i < _girderSegments; i++)
+            var offset = Matrix4x4.Translate(towerGirder.TransformVector(Vector3.down * initialHeight));
+
+            for (var i = 0; i < _girderSegments; i++)
             {
                 _girderMatrices[i] = matrix;
-                matrix *= offset;
+                matrix = offset * matrix;
             }
 
             Graphics.DrawMeshInstanced(_girderMesh, 0, _girderMaterial, _girderMatrices, _girderSegments, part.mpb);