Faire un nouveau four
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Augmente la position Y
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Euh, dans quel partie du code?? Ça?
/** * Tick au hasard qui fait spawn des flammes et de la fumée */ public void randomDisplayTick(World par1World, int par2, int par3, int par4, Random par5Random) { if (this.isActive) { int l = par1World.getBlockMetadata(par2, par3, par4); float f = (float)par2 + 0.5F; float f1 = (float)par3 + 0.0F + par5Random.nextFloat() * 6.0F / 16.0F; float f2 = (float)par4 + 0.5F; float f3 = 0.52F; float f4 = par5Random.nextFloat() * 0.6F - 0.3F; if (l == 4) { par1World.spawnParticle("smoke", (double)(f - f3), (double)f1, (double)(f2 + f4), 0.0D, 0.0D, 0.0D); par1World.spawnParticle("flame", (double)(f - f3), (double)f1, (double)(f2 + f4), 0.0D, 0.0D, 0.0D); } else if (l == 5) { par1World.spawnParticle("smoke", (double)(f + f3), (double)f1, (double)(f2 + f4), 0.0D, 0.0D, 0.0D); par1World.spawnParticle("flame", (double)(f + f3), (double)f1, (double)(f2 + f4), 0.0D, 0.0D, 0.0D); } else if (l == 2) { par1World.spawnParticle("smoke", (double)(f + f4), (double)f1, (double)(f2 - f3), 0.0D, 0.0D, 0.0D); par1World.spawnParticle("flame", (double)(f + f4), (double)f1, (double)(f2 - f3), 0.0D, 0.0D, 0.0D); } else if (l == 3) { par1World.spawnParticle("smoke", (double)(f + f4), (double)f1, (double)(f2 + f3), 0.0D, 0.0D, 0.0D); par1World.spawnParticle("flame", (double)(f + f4), (double)f1, (double)(f2 + f3), 0.0D, 0.0D, 0.0D); } } } -
f1 = Position Y
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ok merci
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Bon, je voudrais qu’on ne puisse utiliser que le bucket de lave dans le four. Mais lorsque je retire les autre objet de fuel, je ne peut pu rien faire cuir! Le bucket ne fonctionne pas!!
package havre; import net.minecraft.block.Block; import net.minecraft.block.material.Material; import net.minecraft.entity.player.EntityPlayer; import net.minecraft.inventory.ISidedInventory; import net.minecraft.item.Item; import net.minecraft.item.ItemBlock; import net.minecraft.item.ItemHoe; import net.minecraft.item.ItemStack; import net.minecraft.item.ItemSword; import net.minecraft.item.ItemTool; import net.minecraft.nbt.NBTTagCompound; import net.minecraft.nbt.NBTTagList; import net.minecraft.tileentity.TileEntity; import cpw.mods.fml.common.registry.GameRegistry; import cpw.mods.fml.relauncher.Side; import cpw.mods.fml.relauncher.SideOnly; public class TileEntityFour extends TileEntity implements ISidedInventory { private ItemStack[] furnaceItemStacks = new ItemStack[3]; public int getSizeInventory() { return this.furnaceItemStacks.length; } public ItemStack getStackInSlot(int par1) { return this.furnaceItemStacks[par1]; } public ItemStack decrStackSize(int par1, int par2) { if (this.furnaceItemStacks[par1] != null) { ItemStack itemstack; if (this.furnaceItemStacks[par1].stackSize <= par2) { itemstack = this.furnaceItemStacks[par1]; this.furnaceItemStacks[par1] = null; return itemstack; } else { itemstack = this.furnaceItemStacks[par1].splitStack(par2); if (this.furnaceItemStacks[par1].stackSize == 0) { this.furnaceItemStacks[par1] = null; } return itemstack; } } else { return null; } } public ItemStack getStackInSlotOnClosing(int par1) { if (this.furnaceItemStacks[par1] != null) { ItemStack itemstack = this.furnaceItemStacks[par1]; this.furnaceItemStacks[par1] = null; return itemstack; } else { return null; } } public void setInventorySlotContents(int par1, ItemStack par2ItemStack) { this.furnaceItemStacks[par1] = par2ItemStack; if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit()) { par2ItemStack.stackSize = this.getInventoryStackLimit(); } } private String field_94130_e; //Variable a mettre au debut de votre classe public String getInvName() { return this.isInvNameLocalized() ? this.field_94130_e : "container.four"; //Ici, c'est en rapport avec le fichier lang :o } public boolean isInvNameLocalized() { return this.field_94130_e != null && this.field_94130_e.length() > 0; } public void setGuiDisplayName(String par1Str) { this.field_94130_e = par1Str; } public void readFromNBT(NBTTagCompound par1NBTTagCompound) { super.readFromNBT(par1NBTTagCompound); NBTTagList nbttaglist = par1NBTTagCompound.getTagList("Items"); this.furnaceItemStacks = new ItemStack[this.getSizeInventory()]; for (int i = 0; i < nbttaglist.tagCount(); ++i) { NBTTagCompound nbttagcompound1 = (NBTTagCompound)nbttaglist.tagAt(i); byte b0 = nbttagcompound1.getByte("Slot"); if (b0 >= 0 && b0 < this.furnaceItemStacks.length) { this.furnaceItemStacks[b0] = ItemStack.loadItemStackFromNBT(nbttagcompound1); } } this.furnaceBurnTime = par1NBTTagCompound.getShort("BurnTime"); this.furnaceCookTime = par1NBTTagCompound.getShort("CookTime"); this.currentItemBurnTime = getItemBurnTime(this.furnaceItemStacks[1]); if (par1NBTTagCompound.hasKey("CustomName")) { this.field_94130_e = par1NBTTagCompound.getString("CustomName"); } } public void writeToNBT(NBTTagCompound par1NBTTagCompound) { super.writeToNBT(par1NBTTagCompound); par1NBTTagCompound.setShort("BurnTime", (short)this.furnaceBurnTime); par1NBTTagCompound.setShort("CookTime", (short)this.furnaceCookTime); NBTTagList nbttaglist = new NBTTagList(); for (int i = 0; i < this.furnaceItemStacks.length; ++i) { if (this.furnaceItemStacks* != null) { NBTTagCompound nbttagcompound1 = new NBTTagCompound(); nbttagcompound1.setByte("Slot", (byte)i); this.furnaceItemStacks*.writeToNBT(nbttagcompound1); nbttaglist.appendTag(nbttagcompound1); } } par1NBTTagCompound.setTag("Items", nbttaglist); if (this.isInvNameLocalized()) { par1NBTTagCompound.setString("CustomName", this.field_94130_e); } } private static final int[] slots_top = new int[] {0}; private static final int[] slots_bottom = new int[] {2, 1}; private static final int[] slots_sides = new int[] {1}; public int furnaceBurnTime; public int furnaceCookTime; public int currentItemBurnTime; public int getInventoryStackLimit() { return 64; } @SideOnly(Side.CLIENT) public int getCookProgressScaled(int par1) { return this.furnaceCookTime * par1 / 200; } @SideOnly(Side.CLIENT) public int getBurnTimeRemainingScaled(int par1) { if (this.currentItemBurnTime == 0) { this.currentItemBurnTime = 200; } return this.furnaceBurnTime * par1 / this.currentItemBurnTime; } public boolean isBurning() { return this.furnaceBurnTime > 0; } public void updateEntity() { boolean flag = this.furnaceBurnTime > 0; boolean flag1 = false; if (this.furnaceBurnTime > 0) { –this.furnaceBurnTime; } if (!this.worldObj.isRemote) { if (this.furnaceBurnTime == 0 && this.canSmelt()) { this.currentItemBurnTime = this.furnaceBurnTime = getItemBurnTime(this.furnaceItemStacks[1]); if (this.furnaceBurnTime > 0) { flag1 = true; if (this.furnaceItemStacks[1] != null) { –this.furnaceItemStacks[1].stackSize; if (this.furnaceItemStacks[1].stackSize == 0) { this.furnaceItemStacks[1] = this.furnaceItemStacks[1].getItem().getContainerItemStack(furnaceItemStacks[1]); } } } } if (this.isBurning() && this.canSmelt()) { ++this.furnaceCookTime; if (this.furnaceCookTime == 200) { this.furnaceCookTime = 0; this.smeltItem(); flag1 = true; } } else { this.furnaceCookTime = 0; } if (flag != this.furnaceBurnTime > 0) { flag1 = true; BlockFour.updateFurnaceBlockState(this.furnaceBurnTime > 0, this.worldObj, this.xCoord, this.yCoord, this.zCoord); } } if (flag1) { this.onInventoryChanged(); } } private boolean canSmelt() { if (this.furnaceItemStacks[0] == null) { return false; } else { ItemStack itemstack = RecipesFour.smelting().getSmeltingResult(this.furnaceItemStacks[0]); if (itemstack == null) return false; if (this.furnaceItemStacks[2] == null) return true; if (!this.furnaceItemStacks[2].isItemEqual(itemstack)) return false; int result = furnaceItemStacks[2].stackSize + itemstack.stackSize; return (result <= getInventoryStackLimit() && result <= itemstack.getMaxStackSize()); } } public void smeltItem() { if (this.canSmelt()) { ItemStack itemstack = RecipesFour.smelting().getSmeltingResult(this.furnaceItemStacks[0]); if (this.furnaceItemStacks[2] == null) { this.furnaceItemStacks[2] = itemstack.copy(); } else if (this.furnaceItemStacks[2].isItemEqual(itemstack)) { furnaceItemStacks[2].stackSize += itemstack.stackSize; } –this.furnaceItemStacks[0].stackSize; if (this.furnaceItemStacks[0].stackSize <= 0) { this.furnaceItemStacks[0] = null; } } } public static int getItemBurnTime(ItemStack par0ItemStack) { if (par0ItemStack == null) { return 0; } else { int i = par0ItemStack.getItem().itemID; Item item = par0ItemStack.getItem(); if (par0ItemStack.getItem() instanceof ItemBlock && Block.blocksList* != null) { Block block = Block.blocksList*; if (block == Block.woodSingleSlab) { return 150; } if (block.blockMaterial == Material.wood) { return 300; } if (block == Block.field_111034_cE) { return 16000; } } if (item instanceof ItemTool && ((ItemTool) item).getToolMaterialName().equals("WOOD")) return 200; if (item instanceof ItemSword && ((ItemSword) item).getToolMaterialName().equals("WOOD")) return 200; if (item instanceof ItemHoe && ((ItemHoe) item).getMaterialName().equals("WOOD")) return 200; if (i == Item.stick.itemID) return 100; if (i == Item.coal.itemID) return 1600; if (i == Item.bucketLava.itemID) return 20000; if (i == Block.sapling.blockID) return 100; if (i == Item.blazeRod.itemID) return 2400; return GameRegistry.getFuelValue(par0ItemStack); } } public static boolean isItemFuel(ItemStack par0ItemStack) { return getItemBurnTime(par0ItemStack) > 0; } public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer) { return this.worldObj.getBlockTileEntity(this.xCoord, this.yCoord, this.zCoord) != this ? false : par1EntityPlayer.getDistanceSq((double)this.xCoord + 0.5D, (double)this.yCoord + 0.5D, (double)this.zCoord + 0.5D) <= 64.0D; } public void openChest() {} public void closeChest() {} public boolean isItemValidForSlot(int par1, ItemStack par2ItemStack) { return par1 == 2 ? false : (par1 == 1 ? isItemFuel(par2ItemStack) : true); } public int[] getAccessibleSlotsFromSide(int par1) { return par1 == 0 ? slots_bottom : (par1 == 1 ? slots_top : slots_sides); } public boolean canInsertItem(int par1, ItemStack par2ItemStack, int par3) { return this.isItemValidForSlot(par1, par2ItemStack); } public boolean canExtractItem(int par1, ItemStack par2ItemStack, int par3) { return par3 != 0 || par1 != 1 || par2ItemStack.itemID == Item.bucketEmpty.itemID; } } -
Envoie uniquement le code que tu as modifié, et formate le, car la c’est un gros tas de code très … plat ?
Fait CTRL+MAJ+F dans eclipse pour le formater de manière rapide et efficace.
De plus, tes mappings sont incomplets je pense.
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Mon TileEntityFour
public static int getItemBurnTime(ItemStack par0ItemStack) { if (par0ItemStack == null) { return 0; } else { int i = par0ItemStack.getItem().itemID; Item item = par0ItemStack.getItem(); if (i == Item.bucketLava.itemID) return 20000; return GameRegistry.getFuelValue(par0ItemStack); } } -
C’est assez étrange …
Essaie de remettre un autre item ( Genre coal ) et de tester
Si il faut deux items minimum, mets un item non obtenable normalement avec une valeure nulle pour palier au bug
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Ça ne fonctionne pas
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Je vois pas du tout d’où ça viens

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Dommage

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Bon la je comprend pas, j’ai remis mon TileEntityFour comme avant, mais mon Four ne veut pu rien faire cuir!!!
package havre; import net.minecraft.block.Block; import net.minecraft.block.material.Material; import net.minecraft.entity.player.EntityPlayer; import net.minecraft.inventory.ISidedInventory; import net.minecraft.item.Item; import net.minecraft.item.ItemBlock; import net.minecraft.item.ItemHoe; import net.minecraft.item.ItemStack; import net.minecraft.item.ItemSword; import net.minecraft.item.ItemTool; import net.minecraft.nbt.NBTTagCompound; import net.minecraft.nbt.NBTTagList; import net.minecraft.tileentity.TileEntity; import cpw.mods.fml.common.registry.GameRegistry; import cpw.mods.fml.relauncher.Side; import cpw.mods.fml.relauncher.SideOnly; public class TileEntityFour extends TileEntity implements ISidedInventory { private ItemStack[] furnaceItemStacks = new ItemStack[3]; public int getSizeInventory() { return this.furnaceItemStacks.length; } public ItemStack getStackInSlot(int par1) { return this.furnaceItemStacks[par1]; } public ItemStack decrStackSize(int par1, int par2) { if (this.furnaceItemStacks[par1] != null) { ItemStack itemstack; if (this.furnaceItemStacks[par1].stackSize <= par2) { itemstack = this.furnaceItemStacks[par1]; this.furnaceItemStacks[par1] = null; return itemstack; } else { itemstack = this.furnaceItemStacks[par1].splitStack(par2); if (this.furnaceItemStacks[par1].stackSize == 0) { this.furnaceItemStacks[par1] = null; } return itemstack; } } else { return null; } } public ItemStack getStackInSlotOnClosing(int par1) { if (this.furnaceItemStacks[par1] != null) { ItemStack itemstack = this.furnaceItemStacks[par1]; this.furnaceItemStacks[par1] = null; return itemstack; } else { return null; } } public void setInventorySlotContents(int par1, ItemStack par2ItemStack) { this.furnaceItemStacks[par1] = par2ItemStack; if (par2ItemStack != null && par2ItemStack.stackSize > this.getInventoryStackLimit()) { par2ItemStack.stackSize = this.getInventoryStackLimit(); } } private String field_94130_e; // Variable a mettre au debut de votre classe public String getInvName() { return this.isInvNameLocalized() ? this.field_94130_e : "container.four"; // Ici, c'est en rapport avec le fichier // lang :o } public boolean isInvNameLocalized() { return this.field_94130_e != null && this.field_94130_e.length() > 0; } public void setGuiDisplayName(String par1Str) { this.field_94130_e = par1Str; } public void readFromNBT(NBTTagCompound par1NBTTagCompound) { super.readFromNBT(par1NBTTagCompound); NBTTagList nbttaglist = par1NBTTagCompound.getTagList("Items"); this.furnaceItemStacks = new ItemStack[this.getSizeInventory()]; for (int i = 0; i < nbttaglist.tagCount(); ++i) { NBTTagCompound nbttagcompound1 = (NBTTagCompound) nbttaglist .tagAt(i); byte b0 = nbttagcompound1.getByte("Slot"); if (b0 >= 0 && b0 < this.furnaceItemStacks.length) { this.furnaceItemStacks[b0] = ItemStack .loadItemStackFromNBT(nbttagcompound1); } } this.furnaceBurnTime = par1NBTTagCompound.getShort("BurnTime"); this.furnaceCookTime = par1NBTTagCompound.getShort("CookTime"); this.currentItemBurnTime = getItemBurnTime(this.furnaceItemStacks[1]); if (par1NBTTagCompound.hasKey("CustomName")) { this.field_94130_e = par1NBTTagCompound.getString("CustomName"); } } public void writeToNBT(NBTTagCompound par1NBTTagCompound) { super.writeToNBT(par1NBTTagCompound); par1NBTTagCompound.setShort("BurnTime", (short) this.furnaceBurnTime); par1NBTTagCompound.setShort("CookTime", (short) this.furnaceCookTime); NBTTagList nbttaglist = new NBTTagList(); for (int i = 0; i < this.furnaceItemStacks.length; ++i) { if (this.furnaceItemStacks* != null) { NBTTagCompound nbttagcompound1 = new NBTTagCompound(); nbttagcompound1.setByte("Slot", (byte) i); this.furnaceItemStacks*.writeToNBT(nbttagcompound1); nbttaglist.appendTag(nbttagcompound1); } } par1NBTTagCompound.setTag("Items", nbttaglist); if (this.isInvNameLocalized()) { par1NBTTagCompound.setString("CustomName", this.field_94130_e); } } private static final int[] slots_top = new int[] { 0 }; private static final int[] slots_bottom = new int[] { 2, 1 }; private static final int[] slots_sides = new int[] { 1 }; public int furnaceBurnTime; public int furnaceCookTime; public int currentItemBurnTime; public int getInventoryStackLimit() { return 64; } @SideOnly(Side.CLIENT) public int getCookProgressScaled(int par1) { return this.furnaceCookTime * par1 / 200; } @SideOnly(Side.CLIENT) public int getBurnTimeRemainingScaled(int par1) { if (this.currentItemBurnTime == 0) { this.currentItemBurnTime = 200; } return this.furnaceBurnTime * par1 / this.currentItemBurnTime; } public boolean isBurning() { return this.furnaceBurnTime > 0; } public void updateEntity() { boolean flag = this.furnaceBurnTime > 0; boolean flag1 = false; if (this.furnaceBurnTime > 0) { –this.furnaceBurnTime; } if (!this.worldObj.isRemote) { if (this.furnaceBurnTime == 0 && this.canSmelt()) { this.currentItemBurnTime = this.furnaceBurnTime = getItemBurnTime(this.furnaceItemStacks[1]); if (this.furnaceBurnTime > 0) { flag1 = true; if (this.furnaceItemStacks[1] != null) { –this.furnaceItemStacks[1].stackSize; if (this.furnaceItemStacks[1].stackSize == 0) { this.furnaceItemStacks[1] = this.furnaceItemStacks[1] .getItem().getContainerItemStack( furnaceItemStacks[1]); } } } } if (this.isBurning() && this.canSmelt()) { ++this.furnaceCookTime; if (this.furnaceCookTime == 200) { this.furnaceCookTime = 0; this.smeltItem(); flag1 = true; } } else { this.furnaceCookTime = 0; } if (flag != this.furnaceBurnTime > 0) { flag1 = true; BlockFour.updateFurnaceBlockState(this.furnaceBurnTime > 0, this.worldObj, this.xCoord, this.yCoord, this.zCoord); } } if (flag1) { this.onInventoryChanged(); } } private boolean canSmelt() { if (this.furnaceItemStacks[0] == null) { return false; } else { ItemStack itemstack = RecipesFour.smelting().getSmeltingResult( this.furnaceItemStacks[0]); if (itemstack == null) return false; if (this.furnaceItemStacks[2] == null) return true; if (!this.furnaceItemStacks[2].isItemEqual(itemstack)) return false; int result = furnaceItemStacks[2].stackSize + itemstack.stackSize; return (result <= getInventoryStackLimit() && result <= itemstack .getMaxStackSize()); } } public void smeltItem() { if (this.canSmelt()) { ItemStack itemstack = RecipesFour.smelting().getSmeltingResult( this.furnaceItemStacks[0]); if (this.furnaceItemStacks[2] == null) { this.furnaceItemStacks[2] = itemstack.copy(); } else if (this.furnaceItemStacks[2].isItemEqual(itemstack)) { furnaceItemStacks[2].stackSize += itemstack.stackSize; } –this.furnaceItemStacks[0].stackSize; if (this.furnaceItemStacks[0].stackSize <= 0) { this.furnaceItemStacks[0] = null; } } } public static int getItemBurnTime(ItemStack par0ItemStack) { if (par0ItemStack == null) { return 0; } else { int i = par0ItemStack.getItem().itemID; Item item = par0ItemStack.getItem(); if (par0ItemStack.getItem() instanceof ItemBlock && Block.blocksList* != null) { Block block = Block.blocksList*; if (block == Block.woodSingleSlab) { return 150; } if (block.blockMaterial == Material.wood) { return 300; } if (block == Block.field_111034_cE) { return 16000; } } if (item instanceof ItemTool && ((ItemTool) item).getToolMaterialName().equals("WOOD")) return 200; if (item instanceof ItemSword && ((ItemSword) item).getToolMaterialName().equals("WOOD")) return 200; if (item instanceof ItemHoe && ((ItemHoe) item).getMaterialName().equals("WOOD")) return 200; if (i == Item.stick.itemID) return 100; if (i == Item.coal.itemID) return 1600; if (i == Item.bucketLava.itemID) return 20000; if (i == Block.sapling.blockID) return 100; if (i == Item.blazeRod.itemID) return 2400; return GameRegistry.getFuelValue(par0ItemStack); } } public static boolean isItemFuel(ItemStack par0ItemStack) { return getItemBurnTime(par0ItemStack) > 0; } public boolean isUseableByPlayer(EntityPlayer par1EntityPlayer) { return this.worldObj.getBlockTileEntity(this.xCoord, this.yCoord, this.zCoord) != this ? false : par1EntityPlayer.getDistanceSq( (double) this.xCoord + 0.5D, (double) this.yCoord + 0.5D, (double) this.zCoord + 0.5D) <= 64.0D; } public void openChest() { } public void closeChest() { } public boolean isItemValidForSlot(int par1, ItemStack par2ItemStack) { return par1 == 2 ? false : (par1 == 1 ? isItemFuel(par2ItemStack) : true); } public int[] getAccessibleSlotsFromSide(int par1) { return par1 == 0 ? slots_bottom : (par1 == 1 ? slots_top : slots_sides); } public boolean canInsertItem(int par1, ItemStack par2ItemStack, int par3) { return this.isItemValidForSlot(par1, par2ItemStack); } public boolean canExtractItem(int par1, ItemStack par2ItemStack, int par3) { return par3 != 0 || par1 != 1 || par2ItemStack.itemID == Item.bucketEmpty.itemID; } }–------------------------------------------------
Edit: Désolé c’est moi qui était con depuis le début: j’avais oublier que j’avais changer les craft possible de mon four --'. Vous pouvez rire de ma gueule j’ai bien foiré sur ce coup! xD -
@‘Oniro’:
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Edit: Désolé c’est moi qui était con depuis le début: j’avais oublier que j’avais changer les craft possible de mon four --'. Vous pouvez rire de ma gueule j’ai bien foiré sur ce coup! xDT’en fais pas x), sa m’arrive quand je suis fatiguai x).
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surtout qu’il était pas passer 6h am quand je cherchais la réponse(Ouais je suis québecois). xD
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Bonjour, je me permets de up ce topic pour donner une solution à un problème sans doute due à une autre version, dans le GUIFour.drawGuiContainerBackgroundLayer: (Je suis en 1.6.4)
this.mc.func_110434_K().func_110577_a(field_110410_t);
doit être remplacé par:
this.mc.getTextureManager().bindTexture(field_110410_t);et
I18n.func_135053_a
par:
I18n.getString -
En effet il y avait encore les anciennes mapping (forge < 849). Je vais éditer le poste merci.
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Ah, désolé, j’utilise jamais les bonnes versions de Forge ^^
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très bon tuto, mais si on pourrait avoir les modifications à apporter pour avoir un slot fonctionnel de plus, ce serait parfait.
merci d’avance (quand j’essaye, soit c’est une copie d’un autre slot (on voit deux fois l’item…) soit il sert juste à stocker un stack comme dans un coffre)
d’autres codes à mettre à jour:
11e code java dans le block four : func_96440_m --> getScoreboard
modification classe principale : func_111022_d --> setTextureName
16e code java du TileEntity field_111034_cE --> coalBlock
2e Guifour field_110410_t --> furnaceGuiTextures
Recipes field_111032_cD --> hardenedClay -
C’est un peu plus complexe, j’attend la 1.7 pour mettre a jour le tuto.
Mais ça reste assez simple, dans le système de craft, la ou il check si le slot X a X item, tu ajoute pour qu’il check aussi le slot Y
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J’aimerais qu’au lieu de “remplir” le slotFour quand je cuis quelque chose, j’invoque une entité quand je peux m’y prendre ?