Add GT_MetaTileEntity_CubicMultiBlockBase and a few minor changes

1. add ofCoil() IStructureElement to standardise how to add a homogeneous set of coils to the structure definition
2. Changed newMetaEntity's return type back to IMetaTileEntity to prevent addons crying out
3. Initialize mExtendedFacing to ensure rendering code don't step on null

10 files changed, 288 insertions, 173 deletions

diff --git a/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_CubicMultiBlockBase.java b/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_CubicMultiBlockBase.java
new file mode 100644
index 0000000000..ef53c1bca2
--- /dev/null
+++ b/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_CubicMultiBlockBase.java
@@ -0,0 +1,111 @@
+package gregtech.api.metatileentity.implementations;
+
+import com.gtnewhorizon.structurelib.structure.IStructureDefinition;
+import com.gtnewhorizon.structurelib.structure.IStructureElement;
+import com.gtnewhorizon.structurelib.structure.StructureDefinition;
+import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
+import net.minecraft.item.ItemStack;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofChain;
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.onElementPass;
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.transpose;
+import static gregtech.api.util.GT_StructureUtility.ofHatchAdder;
+
+/**
+ * A simple 3x3x3 hollow cubic multiblock, that can be arbitrarily rotated, made of a single type of machine casing and accepts hatches everywhere.
+ * Controller will be placed in front center of the structure.
+ * <p>
+ * Note: You cannot use different casing for the same Class. Make a new subclass for it.
+ * <p>
+ * Implementation tips:
+ * 1. To restrict hatches, override {@link #addDynamoToMachineList(IGregTechTileEntity, int)} and its cousins instead of overriding the whole
+ * {@link #getStructureDefinition()} or change {@link #checkHatches(IGregTechTileEntity, ItemStack)}. The former is a total overkill, while the later cannot
+ * stop the structure check early.
+ * 2. To limit rotation, override {@link #getInitialAlignmentLimits()}
+ *
+ * @param <T>
+ */
+public abstract class GT_MetaTileEntity_CubicMultiBlockBase<T extends GT_MetaTileEntity_CubicMultiBlockBase<T>> extends GT_MetaTileEntity_EnhancedMultiBlockBase<T> {
+	protected static final String STRUCTURE_PIECE_MAIN = "main";
+	private static final ConcurrentMap<Integer, IStructureDefinition<?>> STRUCTURE_DEFINITIONS = new ConcurrentHashMap<>();
+	private int mCasingAmount = 0;
+
+	protected GT_MetaTileEntity_CubicMultiBlockBase(int aID, String aName, String aNameRegional) {
+		super(aID, aName, aNameRegional);
+	}
+
+	protected GT_MetaTileEntity_CubicMultiBlockBase(String aName) {
+		super(aName);
+	}
+
+
+	private static IStructureDefinition<? extends GT_MetaTileEntity_CubicMultiBlockBase<?>> createStructure(GT_MetaTileEntity_CubicMultiBlockBase<?> aTile) {
+		return StructureDefinition.<GT_MetaTileEntity_CubicMultiBlockBase<?>>builder()
+				.addShape(STRUCTURE_PIECE_MAIN, transpose(new String[][]{
+						{"hhh", "hhh", "hhh"},
+						{"h-h", "hhh", "hhh"},
+						{"hhh", "hhh", "hhh"},
+				}))
+				.addElement('h', ofChain(
+						ofHatchAdder(GT_MetaTileEntity_CubicMultiBlockBase::addToMachineList, aTile.getHatchTextureIndex(), 1),
+						onElementPass(
+								GT_MetaTileEntity_CubicMultiBlockBase::onCorrectCasingAdded,
+								aTile.getCasingElement()
+						)
+				))
+				.build();
+	}
+
+	/**
+	 * Create a simple 3x3x3 hollow cubic structure made of a single type of machine casing and accepts hatches everywhere.
+	 * <p>
+	 * The created definition contains a single piece named {@link #STRUCTURE_PIECE_MAIN}.
+	 */
+	@Override
+	@SuppressWarnings("unchecked")
+	public IStructureDefinition<T> getStructureDefinition() {
+		return (IStructureDefinition<T>) STRUCTURE_DEFINITIONS.computeIfAbsent(getBaseMetaTileEntity().getMetaTileID(), o -> createStructure(this));
+	}
+
+	@Override
+	public void construct(ItemStack aStack, boolean aHintsOnly) {
+		buildPiece(STRUCTURE_PIECE_MAIN, aStack, aHintsOnly, 1, 1, 0);
+	}
+
+	@Override
+	public boolean checkMachine(IGregTechTileEntity aBaseMetaTileEntity, ItemStack aStack) {
+		mCasingAmount = 0;
+		return checkPiece(STRUCTURE_PIECE_MAIN, 1, 1, 0) &&
+				mCasingAmount > getRequiredCasingCount() &&
+				checkHatches(aBaseMetaTileEntity, aStack);
+	}
+
+	/**
+	 * Called by {@link #checkMachine(IGregTechTileEntity, ItemStack)} to check if all required hatches are present.
+	 * <p>
+	 * Default implementation requires EXACTLY ONE maintenance hatch to be present, and ignore all other conditions.
+	 *
+	 * @param aBaseMetaTileEntity the tile entity of self
+	 * @param aStack              The item stack inside the controller
+	 * @return true if the test passes, false otherwise
+	 */
+	protected boolean checkHatches(IGregTechTileEntity aBaseMetaTileEntity, ItemStack aStack) {
+		return mMaintenanceHatches.size() == 1;
+	}
+
+	protected abstract IStructureElement<GT_MetaTileEntity_CubicMultiBlockBase<?>> getCasingElement();
+
+	/**
+	 * The hatch's texture index.
+	 */
+	protected abstract int getHatchTextureIndex();
+
+	protected abstract int getRequiredCasingCount();
+
+	protected void onCorrectCasingAdded() {
+		mCasingAmount++;
+	}
+}
diff --git a/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_EnhancedMultiBlockBase.java b/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_EnhancedMultiBlockBase.java
index c3d41664b7..89d2ce765e 100644
--- a/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_EnhancedMultiBlockBase.java
+++ b/src/main/java/gregtech/api/metatileentity/implementations/GT_MetaTileEntity_EnhancedMultiBlockBase.java
@@ -30,17 +30,15 @@ import java.util.concurrent.atomic.AtomicReferenceArray;
  */
 public abstract class GT_MetaTileEntity_EnhancedMultiBlockBase<T extends GT_MetaTileEntity_EnhancedMultiBlockBase<T>> extends GT_MetaTileEntity_MultiBlockBase implements IAlignment, IConstructable {
 	private static final AtomicReferenceArray<GT_Multiblock_Tooltip_Builder> tooltips = new AtomicReferenceArray<>(GregTech_API.METATILEENTITIES.length);
-	private ExtendedFacing mExtendedFacing;
-	private final IAlignmentLimits mLimits;
+	private ExtendedFacing mExtendedFacing = ExtendedFacing.DEFAULT;
+	private final IAlignmentLimits mLimits = getInitialAlignmentLimits();
 
 	protected GT_MetaTileEntity_EnhancedMultiBlockBase(int aID, String aName, String aNameRegional) {
 		super(aID, aName, aNameRegional);
-		mLimits = getInitialAlignmentLimits();
 	}
 
 	protected GT_MetaTileEntity_EnhancedMultiBlockBase(String aName) {
 		super(aName);
-		mLimits = getInitialAlignmentLimits();
 	}
 
 	@Override
@@ -128,9 +126,6 @@ public abstract class GT_MetaTileEntity_EnhancedMultiBlockBase<T extends GT_Meta
 				Flip.byIndex(aNBT.getByte("mFlip")));
 	}
 
-	@Override
-	public abstract GT_MetaTileEntity_EnhancedMultiBlockBase<T> newMetaEntity(IGregTechTileEntity aTileEntity);
-
 	@SuppressWarnings("unchecked")
 	private IStructureDefinition<GT_MetaTileEntity_EnhancedMultiBlockBase<T>> getCastedStructureDefinition() {
 		return (IStructureDefinition<GT_MetaTileEntity_EnhancedMultiBlockBase<T>>) getStructureDefinition();
diff --git a/src/main/java/gregtech/api/util/GT_StructureUtility.java b/src/main/java/gregtech/api/util/GT_StructureUtility.java
index c8d845ec19..1db672245c 100644
--- a/src/main/java/gregtech/api/util/GT_StructureUtility.java
+++ b/src/main/java/gregtech/api/util/GT_StructureUtility.java
@@ -3,13 +3,24 @@ package gregtech.api.util;
 import com.gtnewhorizon.structurelib.StructureLibAPI;
 import com.gtnewhorizon.structurelib.structure.IStructureElement;
 import com.gtnewhorizon.structurelib.structure.IStructureElementNoPlacement;
+import gregtech.api.GregTech_API;
+import gregtech.api.enums.HeatingCoilLevel;
+import gregtech.api.interfaces.IHeatingCoil;
 import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
 import net.minecraft.block.Block;
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.world.World;
 
+import java.util.function.BiConsumer;
+import java.util.function.BiPredicate;
+import java.util.function.Function;
+
+import static com.gtnewhorizon.structurelib.StructureLibAPI.HINT_BLOCK_META_GENERIC_11;
+
 public class GT_StructureUtility {
+	public static final int HINT_COIL_DEFAULT_DOTS = HINT_BLOCK_META_GENERIC_11;
+
 	private GT_StructureUtility() {
 		throw new AssertionError("Not instantiable");
 	}
@@ -68,4 +79,66 @@ public class GT_StructureUtility {
 			}
 		};
 	}
+
+	/**
+	 * Assume a default of LV coil. Assume all coils accepted. Assumes using {@link #HINT_COIL_DEFAULT_DOTS} as dots.
+	 * @see #ofCoil(BiPredicate, Function, int, Block, int)
+	 */
+	public static <T> IStructureElement<T> ofCoil(BiConsumer<T, HeatingCoilLevel> heatingCoilSetter, Function<T, HeatingCoilLevel> heatingCoilGetter) {
+		return ofCoil((t, l) -> {
+			heatingCoilSetter.accept(t, l);
+			return true;
+		}, heatingCoilGetter, HINT_COIL_DEFAULT_DOTS, GregTech_API.sBlockCasings5, 0);
+	}
+
+	/**
+	 * Assumes using {@link #HINT_COIL_DEFAULT_DOTS} as dots
+	 * @see #ofCoil(BiPredicate, Function, int, Block, int)
+	 */
+	public static <T> IStructureElement<T> ofCoil(BiPredicate<T, HeatingCoilLevel> heatingCoilSetter, Function<T, HeatingCoilLevel> heatingCoilGetter, Block defaultCoil, int defaultMeta) {
+		return ofCoil(heatingCoilSetter, heatingCoilGetter, HINT_COIL_DEFAULT_DOTS, defaultCoil, defaultMeta);
+	}
+
+	/**
+	 * Heating coil structure element.
+	 * @param heatingCoilSetter Notify the controller of this new coil.
+	 *                            Got called exactly once per coil.
+	 *                            Might be called less times if structure test fails.
+	 *                            If the setter returns false then it assumes the coil is rejected.
+	 * @param heatingCoilGetter Get the current heating level. Null means no coil recorded yet.
+	 * @param dots The hinting dots
+	 * @param defaultCoil The block to place when auto constructing
+	 * @param defaultMeta The block meta to place when auto constructing
+	 */
+	public static <T> IStructureElement<T> ofCoil(BiPredicate<T, HeatingCoilLevel> heatingCoilSetter, Function<T, HeatingCoilLevel> heatingCoilGetter, int dots, Block defaultCoil, int defaultMeta) {
+		if (heatingCoilSetter == null || heatingCoilGetter == null) {
+			throw new IllegalArgumentException();
+		}
+		return new IStructureElement<T>() {
+			@Override
+			public boolean check(T t, World world, int x, int y, int z) {
+				Block block = world.getBlock(x, y, z);
+				if (!(block instanceof IHeatingCoil))
+					return false;
+				HeatingCoilLevel existingLevel = heatingCoilGetter.apply(t),
+						newLevel = ((IHeatingCoil) block).getCoilHeat(world.getBlockMetadata(x, y, z));
+				if (existingLevel == null) {
+					return heatingCoilSetter.test(t, newLevel);
+				} else {
+					return newLevel == existingLevel;
+				}
+			}
+
+			@Override
+			public boolean spawnHint(T t, World world, int x, int y, int z, ItemStack trigger) {
+				StructureLibAPI.hintParticle(world, x, y, z, StructureLibAPI.getBlockHint(), dots);
+				return true;
+			}
+
+			@Override
+			public boolean placeBlock(T t, World world, int x, int y, int z, ItemStack trigger) {
+				return world.setBlock(x, y, z, defaultCoil, defaultMeta, 3);
+			}
+		};
+	}
 }
diff --git a/src/main/java/gregtech/api/util/IGT_HatchAdder.java b/src/main/java/gregtech/api/util/IGT_HatchAdder.java
index be0194fc65..362fddaf1f 100644
--- a/src/main/java/gregtech/api/util/IGT_HatchAdder.java
+++ b/src/main/java/gregtech/api/util/IGT_HatchAdder.java
@@ -6,9 +6,10 @@ import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
 public interface IGT_HatchAdder<T> {
     /**
      * Callback to add hatch, needs to check if hatch is valid (and add it)
+     *
      * @param iGregTechTileEntity hatch
-     * @param aShort requested texture index, or null if not...
+     * @param aShort              requested texture index, or null if not...
      * @return managed to add hatch (structure still valid)
      */
-    boolean apply(T t,IGregTechTileEntity iGregTechTileEntity, Short aShort);
+    boolean apply(T t, IGregTechTileEntity iGregTechTileEntity, Short aShort);
 }
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AbstractMultiFurnace.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AbstractMultiFurnace.java
index ad49c72313..2409c1660c 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AbstractMultiFurnace.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_AbstractMultiFurnace.java
@@ -1,15 +1,13 @@
 package gregtech.common.tileentities.machines.multi;
 
 import gregtech.api.enums.HeatingCoilLevel;
-import gregtech.api.interfaces.IHeatingCoil;
 import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
 import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_EnhancedMultiBlockBase;
-import net.minecraft.block.Block;
 import net.minecraft.item.ItemStack;
 
 public abstract class GT_MetaTileEntity_AbstractMultiFurnace<T extends GT_MetaTileEntity_AbstractMultiFurnace<T>> extends GT_MetaTileEntity_EnhancedMultiBlockBase<T> {
 
-    protected HeatingCoilLevel mCoilLevel;
+    private HeatingCoilLevel mCoilLevel;
 
     protected GT_MetaTileEntity_AbstractMultiFurnace(int aID, String aName, String aNameRegional) {
         super(aID, aName, aNameRegional);
@@ -24,16 +22,6 @@ public abstract class GT_MetaTileEntity_AbstractMultiFurnace<T extends GT_MetaTi
         return true;
     }
 
-    protected final boolean addCoil(Block aBlock, int aMeta) {
-        if (aBlock instanceof IHeatingCoil) {
-            if (mCoilLevel != null)
-                return mCoilLevel == ((IHeatingCoil) aBlock).getCoilHeat(aMeta);
-            mCoilLevel = ((IHeatingCoil) aBlock).getCoilHeat(aMeta);
-            return true;
-        }
-        return false;
-    }
-
     protected boolean addBottomHatch(IGregTechTileEntity aTileEntity, int aBaseCasingIndex) {
         return addMaintenanceToMachineList(aTileEntity, aBaseCasingIndex) ||
                 addInputToMachineList(aTileEntity, aBaseCasingIndex) ||
@@ -60,4 +48,12 @@ public abstract class GT_MetaTileEntity_AbstractMultiFurnace<T extends GT_MetaTi
     public boolean explodesOnComponentBreak(ItemStack aStack) {
         return false;
     }
+
+    public HeatingCoilLevel getCoilLevel() {
+        return mCoilLevel;
+    }
+
+    public void setCoilLevel(HeatingCoilLevel aCoilLevel) {
+        mCoilLevel = aCoilLevel;
+    }
 }
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ElectricBlastFurnace.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ElectricBlastFurnace.java
index 149c7a4172..21b06bc749 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ElectricBlastFurnace.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ElectricBlastFurnace.java
@@ -16,6 +16,7 @@ import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_Hatch_Outpu
 import gregtech.api.render.TextureFactory;
 import gregtech.api.util.GT_Multiblock_Tooltip_Builder;
 import gregtech.api.util.GT_Recipe;
+import gregtech.api.util.GT_StructureUtility;
 import gregtech.api.util.GT_Utility;
 import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.item.ItemStack;
@@ -26,11 +27,14 @@ import net.minecraftforge.fluids.FluidStack;
 
 import java.util.ArrayList;
 
-import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofBlockAdder;
 import static com.gtnewhorizon.structurelib.structure.StructureUtility.transpose;
 import static gregtech.api.enums.GT_Values.V;
 import static gregtech.api.enums.GT_Values.VN;
-import static gregtech.api.enums.Textures.BlockIcons.*;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_ELECTRIC_BLAST_FURNACE;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_ELECTRIC_BLAST_FURNACE_ACTIVE;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_ELECTRIC_BLAST_FURNACE_ACTIVE_GLOW;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_ELECTRIC_BLAST_FURNACE_GLOW;
+import static gregtech.api.enums.Textures.BlockIcons.casingTexturePages;
 import static gregtech.api.util.GT_StructureUtility.ofHatchAdder;
 import static gregtech.api.util.GT_StructureUtility.ofHatchAdderOptional;
 
@@ -51,7 +55,7 @@ public class GT_MetaTileEntity_ElectricBlastFurnace extends GT_MetaTileEntity_Ab
             }))
             .addElement('t', ofHatchAdderOptional(GT_MetaTileEntity_ElectricBlastFurnace::addOutputHatchToTopList, CASING_INDEX, 1, GregTech_API.sBlockCasings1, CASING_INDEX))
             .addElement('m', ofHatchAdder(GT_MetaTileEntity_ElectricBlastFurnace::addMufflerToMachineList, CASING_INDEX, 2))
-            .addElement('C', ofBlockAdder(GT_MetaTileEntity_ElectricBlastFurnace::addCoil, GregTech_API.sBlockCasings5, 0))
+            .addElement('C', GT_StructureUtility.ofCoil(GT_MetaTileEntity_ElectricBlastFurnace::setCoilLevel, GT_MetaTileEntity_ElectricBlastFurnace::getCoilLevel))
             .addElement('b', ofHatchAdderOptional(GT_MetaTileEntity_ElectricBlastFurnace::addBottomHatch, CASING_INDEX, 3, GregTech_API.sBlockCasings1, CASING_INDEX))
             .build();
 
@@ -64,7 +68,7 @@ public class GT_MetaTileEntity_ElectricBlastFurnace extends GT_MetaTileEntity_Ab
     }
 
     @Override
-    public GT_MetaTileEntity_ElectricBlastFurnace newMetaEntity(IGregTechTileEntity aTileEntity) {
+    public IMetaTileEntity newMetaEntity(IGregTechTileEntity aTileEntity) {
         return new GT_MetaTileEntity_ElectricBlastFurnace(this.mName);
     }
 
@@ -252,15 +256,15 @@ public class GT_MetaTileEntity_ElectricBlastFurnace extends GT_MetaTileEntity_Ab
 
         replaceDeprecatedCoils(aBaseMetaTileEntity);
 
-        mCoilLevel = null;
+        setCoilLevel(null);
 
         if (!checkPiece(STRUCTURE_PIECE_MAIN, 1, 3, 0))
             return false;
 
-        if (mCoilLevel == null)
+        if (getCoilLevel() == null)
             return false;
 
-        this.mHeatingCapacity = (int) mCoilLevel.getHeat() + 100 * (GT_Utility.getTier(getMaxInputVoltage()) - 2);
+        this.mHeatingCapacity = (int) getCoilLevel().getHeat() + 100 * (GT_Utility.getTier(getMaxInputVoltage()) - 2);
         return true;
     }
 
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ImplosionCompressor.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ImplosionCompressor.java
index 3d979bb862..0ea6faef89 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ImplosionCompressor.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ImplosionCompressor.java
@@ -1,5 +1,6 @@
 package gregtech.common.tileentities.machines.multi;
 
+import com.gtnewhorizon.structurelib.structure.IStructureElement;
 import gregtech.api.GregTech_API;
 import gregtech.api.enums.Textures;
 import gregtech.api.enums.Textures.BlockIcons;
@@ -7,25 +8,24 @@ import gregtech.api.gui.GT_GUIContainer_MultiMachine;
 import gregtech.api.interfaces.ITexture;
 import gregtech.api.interfaces.metatileentity.IMetaTileEntity;
 import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
-import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_MultiBlockBase;
+import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_CubicMultiBlockBase;
 import gregtech.api.render.TextureFactory;
 import gregtech.api.util.GT_Multiblock_Tooltip_Builder;
 import gregtech.api.util.GT_Recipe;
 import gregtech.api.util.GT_Utility;
-import net.minecraft.block.Block;
 import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.common.util.ForgeDirection;
-import org.lwjgl.input.Keyboard;
 
 import java.util.ArrayList;
 
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofBlock;
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofChain;
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_IMPLOSION_COMPRESSOR;
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_IMPLOSION_COMPRESSOR_ACTIVE;
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_IMPLOSION_COMPRESSOR_ACTIVE_GLOW;
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_IMPLOSION_COMPRESSOR_GLOW;
 
-public class GT_MetaTileEntity_ImplosionCompressor extends GT_MetaTileEntity_MultiBlockBase {
+public class GT_MetaTileEntity_ImplosionCompressor extends GT_MetaTileEntity_CubicMultiBlockBase<GT_MetaTileEntity_ImplosionCompressor> {
     public GT_MetaTileEntity_ImplosionCompressor(int aID, String aName, String aNameRegional) {
         super(aID, aName, aNameRegional);
     }
@@ -40,7 +40,7 @@ public class GT_MetaTileEntity_ImplosionCompressor extends GT_MetaTileEntity_Mul
     }
 
     @Override
-    public String[] getDescription() {
+    protected GT_Multiblock_Tooltip_Builder createTooltip() {
         final GT_Multiblock_Tooltip_Builder tt = new GT_Multiblock_Tooltip_Builder();
         tt.addMachineType("Implosion Compressor")
                 .addInfo("Explosions are fun")
@@ -57,11 +57,7 @@ public class GT_MetaTileEntity_ImplosionCompressor extends GT_MetaTileEntity_Mul
                 .addInputBus("Any casing")
                 .addOutputBus("Any casing")
                 .toolTipFinisher("Gregtech");
-        if (Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
-            return tt.getStructureInformation();
-        } else {
-            return tt.getInformation();
-        }
+        return tt;
     }
 
     @Override
@@ -95,11 +91,6 @@ public class GT_MetaTileEntity_ImplosionCompressor extends GT_MetaTileEntity_Mul
     }
 
     @Override
-    public boolean isFacingValid(byte aFacing) {
-        return aFacing > 1;
-    }
-
-    @Override
     public boolean checkRecipe(ItemStack aStack) {
         ArrayList<ItemStack> tInputList = getStoredInputs();
         int tInputList_sS=tInputList.size();
@@ -147,31 +138,18 @@ public class GT_MetaTileEntity_ImplosionCompressor extends GT_MetaTileEntity_Mul
     }
 
     @Override
-    public boolean checkMachine(IGregTechTileEntity aBaseMetaTileEntity, ItemStack aStack) {
-        int xDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetX;
-        int zDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetZ;
-        if (!aBaseMetaTileEntity.getAirOffset(xDir, 0, zDir)) {
-            return false;
-        }
-        int tAmount = 0;
-        for (int i = -1; i < 2; i++) {
-            for (int j = -1; j < 2; j++) {
-                for (int h = -1; h < 2; h++) {
-                    if ((h != 0) || (((xDir + i != 0) || (zDir + j != 0)) && ((i != 0) || (j != 0)))) {
-                        IGregTechTileEntity tTileEntity = aBaseMetaTileEntity.getIGregTechTileEntityOffset(xDir + i, h, zDir + j);
-                        if ((!addMaintenanceToMachineList(tTileEntity, 16)) && (!addMufflerToMachineList(tTileEntity, 16)) && (!addInputToMachineList(tTileEntity, 16)) && (!addOutputToMachineList(tTileEntity, 16)) && (!addEnergyInputToMachineList(tTileEntity, 16))) {
-                            Block tBlock = aBaseMetaTileEntity.getBlockOffset(xDir + i, h, zDir + j);
-                            byte tMeta = aBaseMetaTileEntity.getMetaIDOffset(xDir + i, h, zDir + j);
-                            if (((tBlock != GregTech_API.sBlockCasings2) || (tMeta != 0)) && ((tBlock != GregTech_API.sBlockCasings3) || (tMeta != 4))) {
-                                return false;
-                            }
-                            tAmount++;
-                        }
-                    }
-                }
-            }
-        }
-        return tAmount >= 16;
+    protected IStructureElement<GT_MetaTileEntity_CubicMultiBlockBase<?>> getCasingElement() {
+        return ofChain(ofBlock(GregTech_API.sBlockCasings2, 0), ofBlock(GregTech_API.sBlockCasings3, 4));
+    }
+
+    @Override
+    protected int getHatchTextureIndex() {
+        return 17;
+    }
+
+    @Override
+    protected int getRequiredCasingCount() {
+        return 16;
     }
 
     @Override
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_MultiFurnace.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_MultiFurnace.java
index aae7497f04..96bc87ff74 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_MultiFurnace.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_MultiFurnace.java
@@ -13,20 +13,23 @@ import gregtech.api.render.TextureFactory;
 import gregtech.api.util.GT_ModHandler;
 import gregtech.api.util.GT_Multiblock_Tooltip_Builder;
 import gregtech.api.util.GT_Recipe;
+import gregtech.api.util.GT_StructureUtility;
 import gregtech.api.util.GT_Utility;
 import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumChatFormatting;
 import net.minecraft.util.StatCollector;
 import net.minecraftforge.common.util.ForgeDirection;
-import org.lwjgl.input.Keyboard;
 
 import java.util.ArrayList;
 
 import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofBlock;
-import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofBlockAdder;
 import static gregtech.api.enums.GT_Values.VN;
-import static gregtech.api.enums.Textures.BlockIcons.*;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_MULTI_SMELTER;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_MULTI_SMELTER_ACTIVE;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_MULTI_SMELTER_ACTIVE_GLOW;
+import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_MULTI_SMELTER_GLOW;
+import static gregtech.api.enums.Textures.BlockIcons.casingTexturePages;
 import static gregtech.api.util.GT_StructureUtility.ofHatchAdder;
 import static gregtech.api.util.GT_StructureUtility.ofHatchAdderOptional;
 
@@ -44,7 +47,7 @@ public class GT_MetaTileEntity_MultiFurnace extends GT_MetaTileEntity_AbstractMu
             })
             .addElement('c', ofBlock(GregTech_API.sBlockCasings1, CASING_INDEX))
             .addElement('m', ofHatchAdder(GT_MetaTileEntity_MultiFurnace::addMufflerToMachineList, CASING_INDEX, 2))
-            .addElement('C', ofBlockAdder(GT_MetaTileEntity_MultiFurnace::addCoil, GregTech_API.sBlockCasings5, 0))
+            .addElement('C', GT_StructureUtility.ofCoil(GT_MetaTileEntity_MultiFurnace::setCoilLevel, GT_MetaTileEntity_MultiFurnace::getCoilLevel))
             .addElement('b', ofHatchAdderOptional(GT_MetaTileEntity_MultiFurnace::addBottomHatch, CASING_INDEX, 3, GregTech_API.sBlockCasings1, CASING_INDEX))
             .build();
 
@@ -170,16 +173,16 @@ public class GT_MetaTileEntity_MultiFurnace extends GT_MetaTileEntity_AbstractMu
 
         replaceDeprecatedCoils(aBaseMetaTileEntity);
 
-        mCoilLevel = null;
+        setCoilLevel(null);
 
         if (!checkPiece(STRUCTURE_PIECE_MAIN, 1, 2, 0))
             return false;
 
-        if (mCoilLevel == null)
+        if (getCoilLevel() == null)
             return false;
 
-        this.mLevel = mCoilLevel.getLevel();
-        this.mCostDiscount = mCoilLevel.getCostDiscount();
+        this.mLevel = getCoilLevel().getLevel();
+        this.mCostDiscount = getCoilLevel().getCostDiscount();
         return true;
     }
 
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java
index 684cead86c..cf29f13b9b 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_ProcessingArray.java
@@ -1,5 +1,6 @@
 package gregtech.common.tileentities.machines.multi;
 
+import com.gtnewhorizon.structurelib.structure.IStructureElement;
 import gregtech.GT_Mod;
 import gregtech.api.GregTech_API;
 import gregtech.api.enums.GT_Values;
@@ -9,9 +10,9 @@ import gregtech.api.gui.GT_GUIContainer_MultiMachine;
 import gregtech.api.interfaces.ITexture;
 import gregtech.api.interfaces.metatileentity.IMetaTileEntity;
 import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
+import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_CubicMultiBlockBase;
 import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_Hatch_Energy;
 import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_Hatch_InputBus;
-import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_MultiBlockBase;
 import gregtech.api.render.TextureFactory;
 import gregtech.api.util.GT_Multiblock_Tooltip_Builder;
 import gregtech.api.util.GT_ProcessingArray_Manager;
@@ -24,16 +25,15 @@ import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.EnumChatFormatting;
 import net.minecraft.util.StatCollector;
-import net.minecraftforge.common.util.ForgeDirection;
 import net.minecraftforge.fluids.FluidStack;
 import org.apache.commons.lang3.ArrayUtils;
-import org.lwjgl.input.Keyboard;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 
+import static com.gtnewhorizon.structurelib.structure.StructureUtility.ofBlock;
 import static gregtech.api.enums.GT_Values.VN;
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_PROCESSING_ARRAY;
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_PROCESSING_ARRAY_ACTIVE;
@@ -41,7 +41,7 @@ import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_PROCESSING_AR
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_PROCESSING_ARRAY_GLOW;
 import static gregtech.api.metatileentity.implementations.GT_MetaTileEntity_BasicMachine.isValidForLowGravity;
 
-public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBlockBase {
+public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_CubicMultiBlockBase<GT_MetaTileEntity_ProcessingArray> {
 
     private GT_Recipe mLastRecipe;
     private int tTier = 0;
@@ -62,7 +62,7 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
     }
 
     @Override
-    public String[] getDescription() {
+    protected GT_Multiblock_Tooltip_Builder createTooltip() {
         final GT_Multiblock_Tooltip_Builder tt = new GT_Multiblock_Tooltip_Builder();
         tt.addMachineType("Processing Array")
                 .addInfo("Runs supplied machines as if placed in the world")
@@ -83,11 +83,7 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
                 .addOutputBus("Any casing")
                 .addOutputHatch("Any casing")
                 .toolTipFinisher("Gregtech");
-        if (Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
-            return tt.getStructureInformation();
-        } else {
-            return tt.getInformation();
-        }
+        return tt;
     }
 
     @Override
@@ -146,11 +142,6 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
         return aStack != null && aStack.getUnlocalizedName().startsWith("gt.blockmachines.basicmachine.");
     }
 
-    @Override
-    public boolean isFacingValid(byte aFacing) {
-        return aFacing > 1;
-    }
-
     private String mMachine = "";
 
     @Override
@@ -328,32 +319,18 @@ public class GT_MetaTileEntity_ProcessingArray extends GT_MetaTileEntity_MultiBl
     }
 
     @Override
-    public boolean checkMachine(IGregTechTileEntity aBaseMetaTileEntity, ItemStack aStack) {
-        int xDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetX;
-        int zDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetZ;
-        if (!aBaseMetaTileEntity.getAirOffset(xDir, 0, zDir)) {
-            return false;
-        }
-        int tAmount = 0;
-        for (int i = -1; i < 2; i++) {
-            for (int j = -1; j < 2; j++) {
-                for (int h = -1; h < 2; h++) {
-                    if ((h != 0) || (((xDir + i != 0) || (zDir + j != 0)) && ((i != 0) || (j != 0)))) {
-                        IGregTechTileEntity tTileEntity = aBaseMetaTileEntity.getIGregTechTileEntityOffset(xDir + i, h, zDir + j);
-                        if ((!addMaintenanceToMachineList(tTileEntity, 48)) && (!addInputToMachineList(tTileEntity, 48)) && (!addOutputToMachineList(tTileEntity, 48)) && (!addEnergyInputToMachineList(tTileEntity, 48))) {
-                            if (aBaseMetaTileEntity.getBlockOffset(xDir + i, h, zDir + j) != GregTech_API.sBlockCasings4) {
-                                return false;
-                            }
-                            if (aBaseMetaTileEntity.getMetaIDOffset(xDir + i, h, zDir + j) != 0) {
-                                return false;
-                            }
-                            tAmount++;
-                        }
-                    }
-                }
-            }
-        }
-        return tAmount >= 14;
+    protected IStructureElement<GT_MetaTileEntity_CubicMultiBlockBase<?>> getCasingElement() {
+        return ofBlock(GregTech_API.sBlockCasings4, 0);
+    }
+
+    @Override
+    protected int getHatchTextureIndex() {
+        return 48;
+    }
+
+    @Override
+    protected int getRequiredCasingCount() {
+        return 14;
     }
 
     @Override
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_VacuumFreezer.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_VacuumFreezer.java
index c800592d0d..0050799ea2 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_VacuumFreezer.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_VacuumFreezer.java
@@ -1,19 +1,19 @@
 package gregtech.common.tileentities.machines.multi;
 
+import com.gtnewhorizon.structurelib.structure.IStructureElement;
+import com.gtnewhorizon.structurelib.structure.StructureUtility;
 import gregtech.api.GregTech_API;
 import gregtech.api.gui.GT_GUIContainer_MultiMachine;
 import gregtech.api.interfaces.ITexture;
 import gregtech.api.interfaces.metatileentity.IMetaTileEntity;
 import gregtech.api.interfaces.tileentity.IGregTechTileEntity;
-import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_MultiBlockBase;
+import gregtech.api.metatileentity.implementations.GT_MetaTileEntity_CubicMultiBlockBase;
 import gregtech.api.render.TextureFactory;
 import gregtech.api.util.GT_Multiblock_Tooltip_Builder;
 import gregtech.api.util.GT_Recipe;
 import gregtech.api.util.GT_Utility;
 import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.item.ItemStack;
-import net.minecraftforge.common.util.ForgeDirection;
-import org.lwjgl.input.Keyboard;
 
 import java.util.ArrayList;
 
@@ -23,7 +23,7 @@ import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_VACUUM_FREEZE
 import static gregtech.api.enums.Textures.BlockIcons.OVERLAY_FRONT_VACUUM_FREEZER_GLOW;
 import static gregtech.api.enums.Textures.BlockIcons.casingTexturePages;
 
-public class GT_MetaTileEntity_VacuumFreezer extends GT_MetaTileEntity_MultiBlockBase {
+public class GT_MetaTileEntity_VacuumFreezer extends GT_MetaTileEntity_CubicMultiBlockBase<GT_MetaTileEntity_VacuumFreezer> {
     public GT_MetaTileEntity_VacuumFreezer(int aID, String aName, String aNameRegional) {
         super(aID, aName, aNameRegional);
     }
@@ -38,25 +38,21 @@ public class GT_MetaTileEntity_VacuumFreezer extends GT_MetaTileEntity_MultiBloc
     }
 
     @Override
-    public String[] getDescription() {
-    	final GT_Multiblock_Tooltip_Builder tt = new GT_Multiblock_Tooltip_Builder();
-		tt.addMachineType("Vacuum Freezer")
-		.addInfo("Controller Block for the Vacuum Freezer")
-		.addInfo("Cools hot ingots and cells")
-		.addSeparator()
-		.beginStructureBlock(3, 3, 3, true)
-		.addController("Front center")
-		.addCasingInfo("Frost Proof Machine Casing", 16)
-		.addEnergyHatch("Any casing")
-		.addMaintenanceHatch("Any casing")
-		.addInputBus("Any casing")
-		.addOutputBus("Any casing")
-		.toolTipFinisher("Gregtech");
-		if (!Keyboard.isKeyDown(Keyboard.KEY_LSHIFT)) {
-			return tt.getInformation();
-		} else {
-			return tt.getStructureInformation();
-		}
+    protected GT_Multiblock_Tooltip_Builder createTooltip() {
+        final GT_Multiblock_Tooltip_Builder tt = new GT_Multiblock_Tooltip_Builder();
+        tt.addMachineType("Vacuum Freezer")
+                .addInfo("Controller Block for the Vacuum Freezer")
+                .addInfo("Cools hot ingots and cells")
+                .addSeparator()
+                .beginStructureBlock(3, 3, 3, true)
+                .addController("Front center")
+                .addCasingInfo("Frost Proof Machine Casing", 16)
+                .addEnergyHatch("Any casing")
+                .addMaintenanceHatch("Any casing")
+                .addInputBus("Any casing")
+                .addOutputBus("Any casing")
+                .toolTipFinisher("Gregtech");
+        return tt;
     }
 
     @Override
@@ -96,11 +92,6 @@ public class GT_MetaTileEntity_VacuumFreezer extends GT_MetaTileEntity_MultiBloc
     }
 
     @Override
-    public boolean isFacingValid(byte aFacing) {
-        return aFacing > 1;
-    }
-
-    @Override
     public boolean checkRecipe(ItemStack aStack) {
         ArrayList<ItemStack> tInputList = getStoredInputs();
         for (ItemStack tInput : tInputList) {
@@ -131,32 +122,18 @@ public class GT_MetaTileEntity_VacuumFreezer extends GT_MetaTileEntity_MultiBloc
     }
 
     @Override
-    public boolean checkMachine(IGregTechTileEntity aBaseMetaTileEntity, ItemStack aStack) {
-        int xDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetX;
-        int zDir = ForgeDirection.getOrientation(aBaseMetaTileEntity.getBackFacing()).offsetZ;
-        if (!aBaseMetaTileEntity.getAirOffset(xDir, 0, zDir)) {
-            return false;
-        }
-        int tAmount = 0;
-        for (int i = -1; i < 2; i++) {
-            for (int j = -1; j < 2; j++) {
-                for (int h = -1; h < 2; h++) {
-                    if ((h != 0) || (((xDir + i != 0) || (zDir + j != 0)) && ((i != 0) || (j != 0)))) {
-                        IGregTechTileEntity tTileEntity = aBaseMetaTileEntity.getIGregTechTileEntityOffset(xDir + i, h, zDir + j);
-                        if ((!addMaintenanceToMachineList(tTileEntity, 17)) && (!addInputToMachineList(tTileEntity, 17)) && (!addOutputToMachineList(tTileEntity, 17)) && (!addEnergyInputToMachineList(tTileEntity, 17))) {
-                            if (aBaseMetaTileEntity.getBlockOffset(xDir + i, h, zDir + j) != GregTech_API.sBlockCasings2) {
-                                return false;
-                            }
-                            if (aBaseMetaTileEntity.getMetaIDOffset(xDir + i, h, zDir + j) != 1) {
-                                return false;
-                            }
-                            tAmount++;
-                        }
-                    }
-                }
-            }
-        }
-        return tAmount >= 16;
+    protected IStructureElement<GT_MetaTileEntity_CubicMultiBlockBase<?>> getCasingElement() {
+        return StructureUtility.ofBlock(GregTech_API.sBlockCasings2, 1);
+    }
+
+    @Override
+    protected int getHatchTextureIndex() {
+        return 17;
+    }
+
+    @Override
+    protected int getRequiredCasingCount() {
+        return 16;
     }
 
     @Override