My forge version is Build 1.6.4-9.11.0.884. I am creating a custom potion effect that places a brick block in front of the player, and when the player moves, the game changes the brick block to whatever type of block was there before. For some reason, when I use setBlock(int xPos, int yPos, int zPos, int blockID), the proper block is changed and the ID of the block is changed(I checked using world.getBlockID(int x, int y, int z)). However, the block is not physically loaded into the world i.e. no texture and no collision box.

 

Does anyone know a fix for this?

 

Here is my custom potion effect class that handles the commands:

 

 

package eclipse.MoreApples.potion;

import net.minecraft.block.Block;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.potion.PotionEffect;
import net.minecraft.util.MathHelper;
import net.minecraft.world.World;

public class BuildingPotionEffect extends PotionEffect{

private EntityPlayer p = null;
private World w;
private boolean doOnce;
private boolean firstTime;
private boolean moved;
private int blockX;
private int blockY;
private int blockZ;
private int oldBlockX;
private int oldBlockY;
private int oldBlockZ;
private int oldBlockID;


private int dir;

public BuildingPotionEffect(int par1, int par2) {
	super(par1, par2);
	doOnce = true;
	firstTime = true;
	moved = true;
}

//This method is called every tick by the potion and is stopped from being called when the potion duration reaches 0
@Override
public boolean onUpdate(EntityLivingBase par1EntityLivingBase)
{
	if(doOnce)
	{
		p =(EntityPlayer) par1EntityLivingBase;
		w = p.worldObj;
		doOnce = false;
	}
	else if(this.duration <= 1)
	{
		doOnce = true;
	}
	//This is the player direction in degrees from 0-360 South is 0, East is 90, North is 180, and West is 270 degrees, 
	dir = MathHelper.floor_double((double)((p.rotationYaw ) + 0.5D));

	//This if statement makes sure that 'dir' is positive 
	if(dir < 0)
		dir*= -1;

	//This method makes sure that 'dir' stays in the range of 0-360 degrees
	if(dir >= 360 || dir <0)
		dir %= 360;

	//See the method description near the method declaration
	setVals(dir);

	w.setBlock(blockX, blockY, blockZ, Block.brick.blockID);
	int temp =p.worldObj.getBlockId(blockX, blockY, blockZ);
	p.addChatMessage("Should place brick block");
	p.addChatMessage("X: " + blockX + "  Y: " + blockY + "  Z: " + blockZ);
	p.addChatMessage("ID of brick is" + Block.brick.blockID + "ID of placed bloc is" + temp);
	if(moved)
	{
		w.setBlock(oldBlockX, oldBlockY, oldBlockZ, oldBlockID);
		p.addChatMessage("Replacing old block");
	}

	p.addChatMessage("Direction is :" + dir);

	return super.onUpdate(par1EntityLivingBase);
}

//This method decides which blocks to change according to which direction the player is facing
private void setVals(double dir)
{
	if(dir <=180)
	{
		if(dir <= 90)
		{
			if(dir <= 45)
			{
				if(dir - 22.5 >= 0)
				{
					blockX = (int) (p.prevPosX-1);
					blockZ = (int) (p.prevPosZ+1);
				}
				else
				{
					blockX = (int) (p.prevPosX);
					blockZ = (int) (p.prevPosZ+1);
				}
			}
			else
			{
				if(dir - 67.5 >= 0)
				{
					blockX = (int) (p.prevPosX-1);
					blockZ = (int) (p.prevPosZ);
				}
				else
				{
					blockX = (int) (p.prevPosX-1);
					blockZ = (int) (p.prevPosZ+1);
				}
			}
		}
		else
		{
			if(dir <= 135)
			{
				if(dir - 112.5 >= 0)
				{
					blockX = (int) (p.prevPosX-1);
					blockZ = (int) (p.prevPosZ-1);
				}
				else
				{
					blockX = (int) (p.prevPosX-1);
					blockZ = (int) (p.prevPosZ);
				}

			}
			else
			{
				if(dir - 157.5 >= 0)
				{
					blockX = (int) (p.prevPosX);
					blockZ = (int) (p.prevPosZ-1);
				}
				else
				{
					blockX = (int) (p.prevPosX-1);
					blockZ = (int) (p.prevPosZ-1);
				}

			}
		}
	}
	else
	{
		if(dir <= 270)
		{
			if(dir <= 225)
			{
				if(dir - 202.5 >= 0)
				{
					blockX = (int) (p.prevPosX+1);
					blockZ = (int) (p.prevPosZ-1);
				}
				else
				{
					blockX = (int) (p.prevPosX);
					blockZ = (int) (p.prevPosZ-1);
				}
			}
			else
			{
				if(dir - 247.5 >= 0)
				{
					blockX = (int) (p.prevPosX+1);
					blockZ = (int) (p.prevPosZ);
				}
				else
				{
					blockX = (int) (p.prevPosX+1);
					blockZ = (int) (p.prevPosZ-1);
				}
			}
		}
		else
		{
			if(dir <= 315)
			{
				if(dir - 292.5 >= 0)
				{
					blockX = (int) (p.prevPosX+1);
					blockZ = (int) (p.prevPosZ+1);
				}
				else
				{
					blockX = (int) (p.prevPosX+1);
					blockZ = (int) (p.prevPosZ);
				}
			}
			else
			{
				if(dir - 337.5 >= 0)
				{
					blockX = (int) (p.prevPosX);
					blockZ = (int) (p.prevPosZ+1);
				}
				else
				{
					blockX = (int) (p.prevPosX+1);
					blockZ = (int) (p.prevPosZ+1);

				}
			}
		}
	}
	blockY = (int) (p.posY-1);

	//Correcting the values instead of re-writing all of those if statements
	blockX-=1;
	blockZ-=1;
	blockX *= -1;




	if(oldBlockX != blockX || oldBlockY != blockY || oldBlockZ != blockZ)
		moved = true;	
	else
		moved = false;


	if(!moved)
	{
		oldBlockX = blockX;
		oldBlockY = blockY;
		oldBlockZ = blockZ;			
	}
	//This if statement is used to initially get the old block coordinates 
	if(firstTime)
	{
		oldBlockID = w.getBlockId(oldBlockX, oldBlockY, oldBlockZ);
		firstTime = false;
		p.addChatMessage("First time");
	}
}


}

 

 

Thanks for reading and helping! =)

Use the bult in debugging tools and println calls to figure out which values the x, y, z's are set too, I'm guessing its not getting the correct coords

Now that I look at your setVals function, I can tell you're doing it wrong.

 

double xx = par3Entity.posX;
	double yy = par3Entity.posY-1;
	double zz = par3Entity.posZ;
	Vec3 v = par3Entity.getLookVec();
	xx += v.xCoord;
	zz += v.zCoord;
	int x = (int)xx;
	int y = (int)yy;
	int z = (int)zz;
	world.setBlock(x, y, z, Block.brick.blockID);

 

That sets the block directly in front of the player, at the level that they're walking, to bricks.

It doesn't take into account strafing, but your intent doesn't appear to need that (my own use could benefit from it, but I'm more amused by the fact that it doesn't).

I tried this, however, when the blocks were placed, they were placed at the player's y-value, but when I closed Minecraft and opened it up again(all in the IDE of course), the blocks were set one y value lower(beneath the player's feet).

 

Do you know why this happens and how I can account for strafing?

 

Thanks =)

My blocks are temporary in nature (allowing the player to "walk on air") so I don't know why the Y value would be off.

 

As to the section question: no, I don't, which is why I decided that it was totally ok for my item to have "downsides" if the user wasn't careful. >:3

Ok, I guess I will play around with it some more and see if I can find a fix. I will post it if I find one.

 

Also, Draco, why was my setVals method wrong?

Also, Draco, why was my setVals method wrong?

 

Way too complex.

To account for strafing, you could use moveForward /moveStrafing in EntityLivingBase...or the motionX.Z fields in Entity.

or the motionX.Z fields in Entity.

 

Funny, I didn't think of that.

 

Oh wait, I did.

 

They're always 0. 

Funny, I didn't think of that.

 

Oh wait, I did.

 

They're always 0. 

Oh right, Mojang changed that with the "boat update".

Then use moveStrafing