[Solved][1.15.2] Trying to get light value

[DarkNoobs12]

Hi, I just started modding and tried to create a simple item that shows the light level the player is in, like in F3, but less debugging mode and more of a real item(for immersion purposes).

From all my trials so far it seems the functions for Light level have been changed recently, since all previous posts mention functions I haven't been able to find, or at least IntelliJ hasn't found them.

 

BlockPos pos = player.getPosition();

BlockState feet = world.getBlockState(pos);

System.out.println(feet.getLightValue(world,pos));

This is my code, but it outputs the light level the block is emitting, not the light level itself. Meaning I get 0 next to a torch, and 14 when I stand on the torch.

What function would give the value I'm looking for?

Edited May 10, 2020 by DarkNoobs12

[DarkNoobs12]

On a side note, what is up with this getLightValue() function? My coding background isn't really in Java, so I might be missing something, but I went into the source code for it and it looks useless and kind of a rabbit hole.

 

This is the getLightValue() I called, implemented in net.minecraftforge.common.extensions.IForgeBlockState:

 

default int getLightValue(IBlockReader world, BlockPos pos)
{
return getBlockState().getBlock().getLightValue(getBlockState(), world, pos);
}

 

It calls a different getLightValue(), which is in net.minecraftforge.common.extensions.IForgeBlock:

default int getLightValue(BlockState state, IBlockReader world, BlockPos pos)
{
return state.getLightValue();
}

 

This getLightValue() calls yet another getLightValue(), and it only requires the BlockState to be called. This getLightValue() is in the net.minecraft.block.BlockState:

public int getLightValue() {
return this.lightLevel;
}

 

Is this a java thing, or just the leftovers of previous versions?

[DarkNoobs12]

1 minute ago, diesieben07 said:

You need to call World#getLight.

Ok, I'll try it.

[Draco18s]

2 minutes ago, DarkNoobs12 said:

On a side note, what is up with this getLightValue() function?

You know how torches and glowstone....glow? getLightValue() returns the amount of light that a block emits.

 

3 minutes ago, DarkNoobs12 said:

Is this a java thing, or just the leftovers of previous versions?

Its a result of Forge trying to supply state-full versions of the method where vanilla does not, so that one block with multiple states can have a different light value for each state (if it so chooses).

[DarkNoobs12]

2 minutes ago, Draco18s said:

You know how torches and glowstone....glow? getLightValue() returns the amount of light that a block emits.

 

Yea, I noticed its intended purpose from the behaviour of the outputs. I was talking more about the way it was coded through multiple functions that called each other. Again, my confusion probably came from a lack of Java background.

 

2 minutes ago, Draco18s said:

Its a result of Forge trying to supply state-full versions of the method where vanilla does not, so that one block with multiple states can have a different light value for each state (if it so chooses).

I see, seems to be a useful feature. Thanks for the answer ?

 

12 minutes ago, diesieben07 said:

You need to call World#getLight.

It worked, thank you!