Cauldrons will not activate comparators if they naturally fill up to the lowest or second lowest water level
Cauldrons fill up when exposed to rain (albeit extremely slowly). Cauldrons also activate comparators based off of their water level. However, when they fill with rain, the comparator only updates when it fills to 100%; at 33% or 66% the comparator remains off unless it receives a manual update.
Code analysis by Marcono1234 can be found in this comment.
Linked Issues
Created Issue:
cauldrons will not activate comparators if they naturally fill up to the lowest or second lowest water level
1.6 caouldrons should fill up with rain and they do , they should als activate comparators , and the sort of do , but only if 100% full if 33% or 66% they just smile at you as they dont update them.
weather machine rendered useless , sad face
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
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1.6 caouldrons should fill up with rain and they do , they should als activate comparators , and the sort of do , but only if 100% full if 33% or 66% they just smile at you as they dont update them.
weather machine rendered useless , sad face
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1.6 caouldronsshouldfill up with rain and they do , they shouldals activate comparators, and the sort of do , but only if 100% full if 33% or 66% they just smile at you as they dontupdatethem.weather machine rendered useless , sad face
Cauldrons fill up when exposed to rain (albeit extremely slowly). Cauldrons also activate comparators based off of their water level. However, when they fill with rain, the comparator only updates when it fills to 100%; at 33% or 66% the comparator remains off unless it receives a manual update.
cauldrons will not activate comparators if they naturally fill up to the lowest or second lowest water levelCauldrons will not activate comparators if they naturally fill up to the lowest or second lowest water level
Cauldrons fill up when exposed to rain (albeit extremely slowly). Cauldrons also activate comparators based off of their water level. However, when they fill with rain, the comparator only updates when it fills to 100%; at 33% or 66% the comparator remains off unless it receives a manual update.
Cauldrons fill up when exposed to rain (albeit extremely slowly). Cauldrons also activate comparators based off of their water level. However, when they fill with rain, the comparator only updates when it fills to 100%; at 33% or 66% the comparator remains off unless it receives a manual update.
Code analysis by Marcono1234 can be found in this comment.
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Duplicate of MC-19451, please use the search function to see if your bug has already been submitted. Currently over 57% of tickets are being closed as duplicate.
Duplicate of MC-19451, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being closed as duplicate.
Duplicate of MC-19451 - If you have not , please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.


Confirmed.
I think the problem is that the cauldrons aren't sending a block update. The comparator reads the correct level when it receives an update. If you want a temporary fix, you could just run a redstone clock or a piston constantly pulsing next to the comparator.
Still occurs in Snapshot 13w38c. As you can see, none of the comparators turned on in either case. As suggested, placing a block adjacent to them updates the comparators. Basically, the cauldron needs to do a block update when water is added via rain.
Still occurs in Snapshot 13w39a.
This report might be more effective if reworded. Something along the lines of "Rain filling Cauldrons not producing block update for Comparators."
Confirmed for
Confirmed for 1.9.3 pre-3
Please link to this comment in the description
The following is based on a decompiled version of Minecraft 1.9 using MCP 9.24 beta.
The reason for this is very likely that the method net.minecraft.block.BlockCauldron.fillWithRain(World, BlockPos) is directly changing the block state instead of calling the method net.minecraft.block.BlockCauldron.setWaterLevel(World, BlockPos, IBlockState, int).
Confirmed for 1.9.4
Confirmed for 17w13b
Merged into MC-120986.