Hello, I am creating a custom potion effect that spawns a custom air block at the player's feet. The custom block acts exactly like air(transparent texture, no collisions, etc.) but it outputs a redstone signal and I have that whole part working. The problem is that I can't get the block to spawn in the same block as the player's feet. It always spawns diagonally to the right.

 

Does anyone know how to use setBlock to set my custom block at the player's feet?

 

Here is my custom potion effect class:

 

 

package eclipse.MoreApples.potion;

import eclipse.MoreApples.common.MoreApples;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.potion.PotionEffect;

public class RedstonePotionEffect extends PotionEffect{

private boolean shouldCheck;
private double oldX;
private double oldY;
private double oldZ;

public RedstonePotionEffect(int par1, int par2) {
	super(par1, par2);
	shouldCheck = true;
}

@Override
public boolean onUpdate(EntityLivingBase p)
{
	EntityPlayer player = (EntityPlayer) p;
	if(shouldCheck)
	{
		/*
		 *This boolean 'shouldCheck' is just used to run this 
		 *segment of code once in order to set the original coordinates
		 *of the player
		 */
		oldX = p.posX;
		oldY = p.posY;
		oldZ = p.posZ;
		shouldCheck = false;
	}
	else if(duration <= 1)
	{
		shouldCheck = true;
	}

	if(p.posX != oldX || p.posY != oldY || p.posZ != oldZ || duration <= 1)
	{
		/*
		 * This segment of code replaces the old block that the player was at to air
		 * Since the player can only walk through air, I always set the blockID to 0
		 * I might add a way to check if the player was in water and set the block to water
		 * But that is not my top priority now =)
		 */

		player.addChatMessage("Should replace old block");
		p.worldObj.setBlock((int)oldX,(int) (oldY+player.yOffset),(int) oldZ, 0);
		oldX = p.posX;
		oldY = p.posY;
		oldZ = p.posZ;
	}
	if(duration > 1)
	p.worldObj.setBlock((int)p.posX, (int)(p.posY+player.yOffset), (int)p.posZ, MoreApples.customRedstoneAir.blockID);
	return super.onUpdate(p);
}



}

 

 

And here is my custom air block class

 

 

package eclipse.MoreApples.block;

import java.util.Random;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IconRegister;
import net.minecraft.util.AxisAlignedBB;
import net.minecraft.world.IBlockAccess;
import net.minecraft.world.World;
import net.minecraftforge.common.ForgeDirection;

public class BlockCustomRedstone extends Block{

public BlockCustomRedstone(int par1, Material par2Material) {
	super(par1, par2Material);
	// TODO Auto-generated constructor stub
}
@Override
 public boolean isAirBlock(World world, int x, int y, int z)
   {
        return true;
   }

 @Override
 public int isProvidingWeakPower(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
    {
        return 15;
    }

@Override
    public void updateTick(World world, int i, int j, int k, Random random)
    {
        world.setBlockToAir(i, j, k);
    }
@Override
    public int tickRate(World world)
    {
        return 1;
    }
@Override
    public int isProvidingStrongPower(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
    {
        return 15;
    }
@Override
    public boolean isBlockSolidOnSide(World world, int x, int y, int z, ForgeDirection side)
    {
        return false;
    }
@Override
    public boolean isCollidable()
    {
        return false;
    }
@Override
    public boolean isOpaqueCube()
    {
        return false;
    }
@Override
    public void breakBlock(World world, int i, int j, int k, int par5, int par6)
    {
		world.notifyBlocksOfNeighborChange(i, j, k, this.blockID);
    }
@Override
    public boolean canProvidePower()
    {
        return true;
    }
@Override
public AxisAlignedBB getCollisionBoundingBoxFromPool(World par1World, int par2, int par3, int par4)
    {
	return null;
    }

@SideOnly(Side.CLIENT)

public void registerIcons(IconRegister register){
	/*
	 * I have not set the texture for this block so
	 * it renders as the default purple and black checkered square
	 * I do know that I have to specify the render pass by overwriting
	 * a method and creating a texture with alpha transparency
	 * but I want to use the purple and black checkered square
	 * for debugging purposes
	 */
}



}

 

 

Thanks for taking the time to help a fellow modder! =)

Most likely a offset issue. Instead of

 

p.worldObj.setBlock((int)p.posX, (int)(p.posY+player.yOffset), (int)p.posZ, MoreApples.customRedstoneAir.blockID);

 

try

p.worldObj.setBlock((int)(p.posX - 0.5D), (int)(p.posY+player.yOffset), (int)(p.posZ - 0.5D), MoreApples.customRedstoneAir.blockID);

I changed it to

 

p.worldObj.setBlock((int)(Math.floor(p.posX)), (int)(p.posY+player.yOffset), (int)(Math.floor(p.posZ)), MoreApples.customRedstoneAir.blockID);

 

and it does what I wanted it to now.

 

Thanks for your help. I'll credit you in my mod =)