Avoid structure snapshots while rendering

src/main/scala/mrtjp/relocation/movement.scala

@@ -356,11 +356,10 @@ class WorldStructs {
     numStructs = 0
   }
 
-  def foreachStruct(f: BlockStruct => Unit) {
-    val arr = synchronized { java.util.Arrays.copyOf(structsArr, numStructs) }
+  def foreachStruct(f: BlockStruct => Unit) = synchronized {
     var i = 0
-    while (i < arr.length) {
-      f(arr(i))
+    while (i < numStructs) {
+      f(structsArr(i))
       i += 1
     }
   }

src/main/scala/mrtjp/relocation/renders.scala

@@ -30,6 +30,11 @@ object MovingRenderer {
   private var frame = 0.0f
   private var renderBlocks: RenderBlocks = null
 
+  private val renderStruct: BlockStruct => Unit = { s =>
+    for (b <- s.preMoveBlocks)
+      render(b.x, b.y, b.z, renderPos(s, frame))
+  }
+
   private def mc = Minecraft.getMinecraft
   private def world = mc.theWorld
 
@@ -101,10 +106,7 @@ object MovingRenderer {
       renderBlocks.renderAllFaces = true
     }
 
-    MovementManager2.getWorldStructs(world).foreachStruct { s =>
-      for (b <- s.preMoveBlocks)
-        render(b.x, b.y, b.z, renderPos(s, frame))
-    }
+    MovementManager2.getWorldStructs(world).foreachStruct(renderStruct)
   }
 
   def onTick() = {