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[1.16.5] Giving potion effect based on the light level of the block player is standing on


Sinu
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Posted (edited)

I am trying to give a blinding effect to players who are in light level of 0 but I can't seem to get it to work.

@SubscribeEvent
    public static void onPlayerTick(TickEvent.PlayerTickEvent event)
    {
		PlayerEntity player = event.player;
		World world = event.player.level;
		BlockPos blockpos = player.blockPosition();
		BlockState block = world.getBlockState(blockpos);
		
		if (block.getLightValue(world, blockpos) == 0 && block != null)
		{
			((LivingEntity)event.player).addEffect(new EffectInstance(Effects.BLINDNESS, 20, 3));
		}
    }

Am I using getLightValue correctly? Also I am correctly feeding in the correct block position?

Edited by Sinu
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I see. What is the second int parameter in World#getRawBrightness for? I looked at the reference and it just seems to subtract it? Not sure why..
Also I believe I tried using World#getBrightness with LightType.BLOCK but I don't think it detected the light level properly. I am trying to give the Blindness effect to players who walk into caves with light levels of 0.

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6 minutes ago, Sinu said:

I see. What is the second int parameter in World#getRawBrightness for? I looked at the reference and it just seems to subtract it? Not sure why..

It's subtracted from the sky light only, not the block light. It is used for mob spawning rules (sky light gets 10 units subtracted during thundering, block light doesn't).

7 minutes ago, Sinu said:

Also I believe I tried using World#getBrightness with LightType.BLOCK but I don't think it detected the light level properly. I am trying to give the Blindness effect to players who walk into caves with light levels of 0.

Block light is 0 almost everywhere, except when you place light emitting blocks like torches. You probably want getRawBrightness instead (or actually getMaxLocalRawBrightness, which checks that the position is correct first).

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Sweet, that seems to have worked!
The one issue is that, I had to check if the instance was client or server because for some reason the server kept thinking the light level of the player is always 0 (is it client-side only?). So my code looks like this now:

PlayerEntity player = event.player;
		World world = event.player.level;
		BlockPos blockpos = player.blockPosition();
		BlockState block = world.getBlockState(blockpos);
		
		if (world.isClientSide)
		{
			System.out.print(world.getMaxLocalRawBrightness(blockpos) + System.lineSeparator());
			if (world.getMaxLocalRawBrightness(blockpos) == 0)
			{
				((LivingEntity)event.player).addEffect(new EffectInstance(Effects.BLINDNESS, 20, 3));	
			}
		}

But now once I walk out of the light level of 0, it still says that I have the Blindness effect even though I can see clearly. I am assuming that since I checked if the instance is client-side or not, it didn't actually give the potion effect according to the server (which makes sense) but I don't understand why Blindness goes away even after I walk into the light?

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for Forge Mod Loader java.lang.RuntimeException: A download error occured     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:354) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.load(DepLoader.java:480) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.loadDeps(DepLoader.java:466) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.load(DepLoader.java:449) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader.load(DepLoader.java:584) ~[DepLoader.class:?]     at codechicken.core.launch.CodeChickenCorePlugin.<init>(CodeChickenCorePlugin.java:47) ~[CodeChickenCore-1.7.10-1.0.7.47-universal.jar:?]     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at 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[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) [forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]     at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?] Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:341) ~[DepLoader$DepLoadInst.class:?]     ... 19 more Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getHeaderFieldLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLengthLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLength(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:340) ~[DepLoader$DepLoadInst.class:?]     ... 19 more [15:36:16] [main/ERROR] [LaunchWrapper]: Unable to launch java.lang.RuntimeException: A download error occured     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:354) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.load(DepLoader.java:480) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.loadDeps(DepLoader.java:466) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader$DepLoadInst.load(DepLoader.java:449) ~[DepLoader$DepLoadInst.class:?]     at codechicken.core.launch.DepLoader.load(DepLoader.java:584) ~[DepLoader.class:?]     at codechicken.core.launch.CodeChickenCorePlugin.<init>(CodeChickenCorePlugin.java:47) ~[CodeChickenCore-1.7.10-1.0.7.47-universal.jar:?]     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.Class.newInstance(Unknown Source) ~[?:1.8.0_291]     at cpw.mods.fml.relauncher.CoreModManager.loadCoreMod(CoreModManager.java:501) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.CoreModManager.discoverCoreMods(CoreModManager.java:389) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.CoreModManager.handleLaunch(CoreModManager.java:221) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.FMLLaunchHandler.setupHome(FMLLaunchHandler.java:90) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.FMLLaunchHandler.setupClient(FMLLaunchHandler.java:67) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.relauncher.FMLLaunchHandler.configureForClientLaunch(FMLLaunchHandler.java:34) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at cpw.mods.fml.common.launcher.FMLTweaker.injectIntoClassLoader(FMLTweaker.java:126) ~[forge-1.7.10-10.13.4.1558-1.7.10.jar:?]     at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]     at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?] Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_291]     at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_291]     at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$10.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getChainedException(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:341) ~[DepLoader$DepLoadInst.class:?]     ... 19 more Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879//Baubles-1.7.10-1.0.1.10.jar     at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_291]     at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_291]     at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getHeaderFieldLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLengthLong(Unknown Source) ~[?:1.8.0_291]     at java.net.URLConnection.getContentLength(Unknown Source) ~[?:1.8.0_291]     at sun.net.www.protocol.https.HttpsURLConnectionImpl.getContentLength(Unknown Source) ~[?:1.8.0_291]     at codechicken.core.launch.DepLoader$DepLoadInst.download(DepLoader.java:340) ~[DepLoader$DepLoadInst.class:?]     ... 19 more Exception in thread "main" [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]: cpw.mods.fml.relauncher.FMLSecurityManager$ExitTrappedException [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at cpw.mods.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:25) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.SecurityManager.checkExit(Unknown Source) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.Runtime.exit(Unknown Source) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at java.lang.System.exit(Unknown Source) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraft.launchwrapper.Launch.launch(Launch.java:138) [15:36:16] [main/INFO] [STDERR]: [java.lang.Throwable$WrappedPrintStream:println:-1]:     at net.minecraft.launchwrapper.Launch.main(Launch.java:28)  
    • Hello! I've been updating old and abandoned mods to the newer versions of Forge as an hobby and to learn more and more of coding myself. I've happened to run into an outdated mod that, in 1.12.2 Forge, implements a new fluid: however, it does so by calling   and   which apparently isn't possible for 1.16.5 Forge. I need the first one to initialize the fluid and the latter to add it to the registry and use it elsewhere in the mod, so how would I do it? Also, is there anywhere I can follow Forge's updates and changes in its classes or structures? It's not the first time I've run into a problem of this sort. Sorry if my question sounds dumb. Thanks so much!
    • Hello everyone,I've been bothered by it for a long time🙃.Here is the excerpt from the code.My jdk is 8 and I've tried JDK17 ,but it did not work. I've set classpath and JAVA_HOME ,and they seems to be normal.Is anyone can help me? Any help is appreciated🥺(My English is not fluent,so I perhaps ask u some stupid questions.Pardon me)    
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