(SOLVED) [1.12] How to get the server-side instance of the player in a client-side method?

[xyz]

Hello, I am trying to make a custom compass that points towards the player's bed, however, IItemPropertyGetter only passes the client-side player in the apply method. The problem is that getBedLocation always returns the world spawn on a client-side player object, the question is: how do I get a server-side instance of the player from nothing?

 

This is the IItemPropertyGetter

Spoiler

this.addPropertyOverride(new ResourceLocation("angle"), new IItemPropertyGetter() {
	    	
	    	@SideOnly(Side.CLIENT)
	        double rotation;
	        @SideOnly(Side.CLIENT)
	        double rota;
	        @SideOnly(Side.CLIENT)
	        long lastUpdateTick;
	        
	        @SideOnly(Side.CLIENT)
	        public float apply(ItemStack stack, @Nullable World worldIn, @Nullable EntityLivingBase entityIn) {
	        	if (entityIn == null && !stack.isOnItemFrame()) {
	                    return 0.0F;
	            } else {
	            	boolean flag = entityIn != null;
	                Entity entity = (Entity)(flag ? entityIn : stack.getItemFrame());
	                if (worldIn == null) {
	                        worldIn = entity.world;
	                }
	                double d0;
	                if (worldIn.provider.isSurfaceWorld()) {
	                	double d1 = flag ? (double)entity.rotationYaw : this.getFrameRotation((EntityItemFrame)entity);
	                	d1 = MathHelper.positiveModulo(d1 / 360.0D, 1.0D);
	                    double d2 = this.getSpawnToAngle(worldIn, entity) / (Math.PI * 2D);
	                    d0 = 0.5D - (d1 - 0.25D - d2);
	                } else {
	                	d0 = Math.random();
	                }
	                if (flag) {
	                        d0 = this.wobble(worldIn, d0);
	                }
	                return MathHelper.positiveModulo((float)d0, 1.0F);
	            }
	        }
	        
	        @SideOnly(Side.CLIENT)
	        private double wobble(World worldIn, double p_185093_2_) {
	        	if (worldIn.getTotalWorldTime() != this.lastUpdateTick) {
	            	this.lastUpdateTick = worldIn.getTotalWorldTime();
	                double d0 = p_185093_2_ - this.rotation;
	            	d0 = MathHelper.positiveModulo(d0 + 0.5D, 1.0D) - 0.5D;
	                this.rota += d0 * 0.1D;
	                this.rota *= 0.8D;
	                this.rotation = MathHelper.positiveModulo(this.rotation + this.rota, 1.0D);
	            }
	                return this.rotation;
	        }
	        
	        @SideOnly(Side.CLIENT)
	        private double getFrameRotation(EntityItemFrame itemFrame) {
	        	return (double)MathHelper.clampAngle(180 + itemFrame.facingDirection.getHorizontalIndex() * 90);
	        }
	        
	        @SideOnly(Side.CLIENT)
	        private double getSpawnToAngle(World world, Entity player) {
				// ???
	        	return 0;
	        }
	        
	    });

 

 

Edited July 11, 2017 by xyz

[Draco18s]

TLDR:

You can't.  And when you could you shouldn't.

[larsgerrits]

Why can't you use the client side player? The vanilla compass uses the client player as well.

[xyz]

2 minutes ago, larsgerrits said:

Why can't you use the client side player? The vanilla compass uses the client player as well.

As I explained in the OP, using getBedLocation() on a client-side player always returns the world spawn while I need the player's bed location.

Edited July 11, 2017 by xyz

[Draco18s]

Ok.

Let me put it this way:

 

The logical client is not always on the same physical machine as the logical server.

 

Ergo you have no access to the server-side player entity.  If you want to reach across logical sides, then by all means, go ahead and do so, but your mod will be SSP only.

[larsgerrits]

If you were to look at the code the vanilla compass uses to determine the user's bed location (AKA the spawnpoint of the user), you could see you can use World#getSpawnPoint to get the client player's spawnpoint.

[xyz]

8 minutes ago, larsgerrits said:

If you were to look at the code the vanilla compass uses to determine the user's bed location (AKA the spawnpoint of the user), you could see you can use World#getSpawnPoint to get the client player's spawnpoint.

While you are technically correct that still doesn't change that I'm looking for the player's bed location and not the world spawn (the vanilla compass points towards the world spawn).

 

9 minutes ago, Draco18s said:

Ok.

Let me put it this way:

 

The logical client is not always on the same physical machine as the logical server.

 

Ergo you have no access to the server-side player entity.  If you want to reach across logical sides, then by all means, go ahead and do so, but your mod will be SSP only.

Thanks a lot for your explanation.

Edited July 11, 2017 by xyz

[larsgerrits]

2 minutes ago, xyz said:

(the vanilla compass points towards the world spawn)

After all this time, how could I forget... My bad.

 

 

[Animefan8888]

17 minutes ago, xyz said:

While you are technically correct that still doesn't change that I'm looking for the player's bed location and not the world spawn (the vanilla compass points towards the world spawn).

 

Thanks a lot for your explanation.

You are gonna want to save the Players Bed spawnpoint to a capability and then update it with packets so the client side also has the data.

[xyz]

1 hour ago, Animefan8888 said:

You are gonna want to save the Players Bed spawnpoint to a capability and then update it with packets so the client side also has the data.

How exactly would I go about using packets? There doesn't really seem to be any up-to-date tutorial on it.

[Animefan8888]

Just now, xyz said:

How exactly would I go about using packets? There doesn't really seem to be any up-to-date tutorial on it.

Packets have not really changed much since 1.7 unless something happened in 1.12 that i don't know about. So here is a tutorial  from Diesieben.