Recently, I had to create a new block for sitting but I had problem with synchronization : the player was correctly placed for the server but not for the client (I'm playing in single player).

I posted this problem on the MinecraftForgeFrance forum but no one could find an answer to my problem (http://www.minecraftforgefrance.fr/showthread.php?tid=2225).

 

My classes :

package fr.scarex.hilium.block;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.world.World;
import fr.scarex.hilium.entity.EntitySit;
import fr.scarex.hilium.tileentity.TileEntitySit;

/**
* @author SCAREX
* 
*/
public class BlockSit extends Block
{
protected BlockSit(Material material) {
	super(material);
}

@Override
public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {
	if (this.canSit(world, x, y, z, player, side, hitX, hitY, hitZ)) {
		Entity entity = world.getEntityByID(((TileEntitySit) world.getTileEntity(x, y, z)).getEntityId());
		if (entity != null) ((EntitySit) entity).interactFirst(player);
		return true;
	}
	return false;
}

public boolean canSit(World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {
	return true;
}

@Override
public void onBlockAdded(World world, int x, int y, int z) {
	EntitySit e = new EntitySit(world, x + 0.5D, y + 0.5D, z + 0.5D, this.getOffsetY(world, x, y, z));
	world.spawnEntityInWorld(e);
	((TileEntitySit) world.getTileEntity(x, y, z)).setEntityId(e.getEntityId());
}

public float getOffsetY(World world, int x, int y, int z) {
	return 0.5F;
}
}

 

package fr.scarex.hilium.tileentity;

import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.Packet;
import net.minecraft.network.play.server.S35PacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;

/**
* @author SCAREX
* 
*/
public class TileEntitySit extends TileEntity
{
protected int entityId;

public int getEntityId() {
	return this.entityId;
}

public void setEntityId(int id) {
	this.entityId = id;
}

@Override
public void readFromNBT(NBTTagCompound comp) {
	super.readFromNBT(comp);
	this.entityId = comp.getInteger("entityId");
}

@Override
public void writeToNBT(NBTTagCompound comp) {
	super.writeToNBT(comp);
	comp.setInteger("entityId", this.entityId);
}

@Override
public Packet getDescriptionPacket() {
	NBTTagCompound comp = new NBTTagCompound();
	this.writeToNBT(comp);
	return new S35PacketUpdateTileEntity(this.xCoord, this.yCoord, this.zCoord, 0, comp);
}

@Override
public void onDataPacket(NetworkManager net, S35PacketUpdateTileEntity pkt) {
	this.readFromNBT(pkt.func_148857_g());
}
}

 

package fr.scarex.hilium.entity;

import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import fr.scarex.hilium.Hilium;
import fr.scarex.hilium.block.BlockSit;

/**
* @author SCAREX
* 
*/
public class EntitySit extends Entity
{
protected float offsetY;

public EntitySit(World world) {
	super(world);
	this.noClip = true;
	this.preventEntitySpawning = true;
	this.setSize(0.0F, 0.0F);
	this.offsetY = 0.0F;
}

public EntitySit(World world, double x, double y, double z, float offsetY) {
	this(world);
	this.setPosition(x, y, z);
	this.offsetY = offsetY;
}

@Override
protected void entityInit() {}

@Override
protected void readEntityFromNBT(NBTTagCompound comp) {}

@Override
protected void writeEntityToNBT(NBTTagCompound comp) {}

@Override
public void onUpdate() {
	super.onUpdate();
	if (!(this.worldObj.getBlock(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posY), MathHelper.floor_double(this.posZ)) instanceof BlockSit)) this.kill();
}

@Override
public boolean interactFirst(EntityPlayer p) {
	if (this.riddenByEntity != null) return true;
	if (!this.worldObj.isRemote) p.mountEntity(this);
	return true;
}

@Override
public double getMountedYOffset() {
	return this.offsetY;
}
}

 

When I click the block the first time, it works, but after the game show the message "Press shift to dismount" but I can move around, and when I throw an Item on the floor, it is threw beside the block, which indicates that this is a problem with synchronization.

Hi

Have you synced your data correctly? When placing the player, sync the data before placing to ensure a pinpoint placement on the server and the client. Maybe the XYZ values are not being updated for the player.

I found out that the method onBlockAdded is fired only on the server, And when I spawn the entity, the client doesn't know that the entity is actually there : I will put the spawn of the mob in another method to see if there is a difference.

Now, I can sit on thee block but the mounted Y offset is correct only for the server :

 

package fr.scarex.hilium.block;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.world.World;
import fr.scarex.hilium.Hilium;
import fr.scarex.hilium.entity.EntitySit;
import fr.scarex.hilium.tileentity.TileEntitySit;

/**
* @author SCAREX
* 
*/
public class BlockSit extends Block
{
protected BlockSit(Material material) {
	super(material);
}

@Override
public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {
	if (this.canSit(world, x, y, z, player, side, hitX, hitY, hitZ)) {
		EntitySit entity = new EntitySit(world, x + 0.5D, y + 0.5D, z + 0.5D, this.getOffsetY(world, x, y, z));
		world.spawnEntityInWorld(entity);
		entity.interactFirst(player);
		return true;
	}
	return false;
}

public boolean canSit(World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {
	return true;
}

public double getOffsetY(World world, int x, int y, int z) {
	return 0.5D;
}
}

 

package fr.scarex.hilium.block;

import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import cpw.mods.fml.common.registry.GameRegistry;
import fr.scarex.hilium.Hilium;
import fr.scarex.hilium.client.ClientProxy;
import fr.scarex.hilium.tileentity.TileEntitySit;
import fr.scarex.hilium.tileentity.TileEntityUseless;

/**
* @author SCAREX
* 
*/
public class BlockToilet extends BlockSit
{
public static final String NAME = "toilet";

protected BlockToilet() {
	super(Material.glass);
	this.setHardness(0.5F);
	this.setResistance(5.0F);

	this.setStepSound(this.soundTypeGlass);
	this.setCreativeTab(CreativeTabs.tabDecorations);

	this.setBlockName(Hilium.MODID + "_" + NAME);
	this.setBlockTextureName(Hilium.MODID + ":" + NAME);

	this.register();
}

private void register() {
	GameRegistry.registerBlock(this, NAME);
	GameRegistry.registerTileEntity(TileEntitySit.class, Hilium.MODID + ":" + NAME);
}

@Override
public boolean renderAsNormalBlock() {
	return false;
}

@Override
public int getRenderType() {
	return ClientProxy.RENDER_ID;
}

@Override
public boolean isOpaqueCube() {
	return false;
}

@Override
public boolean hasTileEntity(int metadata) {
	return true;
}

@Override
public TileEntity createTileEntity(World world, int metadata) {
	return new TileEntitySit();
}

@Override
public void setBlockBoundsForItemRender() {
	this.setBlockBounds(0.05F, 0.0F, 0.05F, 0.95F, 0.88F, 0.95F);
}

@Override
public void registerBlockIcons(IIconRegister register) {
	this.blockIcon = register.registerIcon("glass");
}

@Override
public boolean canPlaceBlockAt(World world, int x, int y, int z) {
	return super.canPlaceBlockAt(world, x, y, z) && World.doesBlockHaveSolidTopSurface(world, x, y - 1, z);
}

@Override
public void onBlockPlacedBy(World world, int x, int y, int z, EntityLivingBase entity, ItemStack stack) {
	int direction = MathHelper.floor_double((double) (entity.rotationYaw * 4.0F / 360.0F) + 2.5D) & 3;
	world.setBlockMetadataWithNotify(x, y, z, direction == 3 ? 0 : direction + 1, 2);
}

@Override
public double getOffsetY(World world, int x, int y, int z) {
	return 0.3D;
}
}

 

package fr.scarex.hilium.entity;

import net.minecraft.entity.Entity;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;
import fr.scarex.hilium.Hilium;
import fr.scarex.hilium.block.BlockSit;

/**
* @author SCAREX
* 
*/
public class EntitySit extends Entity
{
protected double offsetY;

public EntitySit(World world) {
	super(world);
	this.noClip = true;
	this.preventEntitySpawning = true;
	this.setSize(0.0F, 0.0F);
	this.offsetY = 0.0F;
}

public EntitySit(World world, double x, double y, double z, double offsetY) {
	this(world);
	this.setPosition(x, y, z);
	this.offsetY = offsetY;
}

@Override
protected void entityInit() {}

@Override
protected void readEntityFromNBT(NBTTagCompound comp) {}

@Override
protected void writeEntityToNBT(NBTTagCompound comp) {}

@Override
public void onEntityUpdate() {
	if (this.riddenByEntity == null || this.riddenByEntity.isDead) this.setDead();
	super.onEntityUpdate();
}

@Override
public boolean interactFirst(EntityPlayer p) {
	if (this.riddenByEntity != null) return true;
	if (!this.worldObj.isRemote) p.mountEntity(this);
	return true;
}

@Override
public double getMountedYOffset() {
	return this.offsetY;
}
}

I can get it to work by implementing IEntityAdditionalSpawnData, but it takes a bit of time to update the y offset :

 

 

After a bit of time :