Hello together

On testing my own World Ore Gen Geatures i've fond an Error and i don't understand how this Error can Happens.

 

When World is be createted the function place in Any Feature will bee called. When i Configured my Feature with a  placement with bottom-offset top-offset an maxHeigt.

Wenn Place is called it is possible to get an y-value with is lower then bottomOffset. On serching i've fond the Class placement witch is called befor Feture starts.
                

package net.minecraft.world.gen.placement;

import com.mojang.datafixers.Dynamic;
import java.util.Random;
import java.util.function.Function;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import net.minecraft.util.math.BlockPos;

public class HeightBiasedRange extends SimplePlacement<CountRangeConfig> {
   public HeightBiasedRange(Function<Dynamic<?>, ? extends CountRangeConfig> p_i51388_1_) {
      super(p_i51388_1_);
   }

   public Stream<BlockPos> getPositions(Random random, CountRangeConfig p_212852_2_, BlockPos pos) {
      return IntStream.range(0, p_212852_2_.count).mapToObj((p_227436_3_) -> {
         int i = random.nextInt(16) + pos.getX();
         int j = random.nextInt(16) + pos.getZ();
         int k = random.nextInt(random.nextInt(p_212852_2_.maximum - p_212852_2_.topOffset) + p_212852_2_.bottomOffset);
         return new BlockPos(i, k, j);
      });
   }
}

in Line int k = random.. there are two errors:

   a) when calling the inner random.nextInt(..) with Value ..Maximum = 64 and bottomOffset = 30) the parameter in nextInt will not be 34. In some test i fond ther will be allways an value of 31 by differnet values of Maximum and topOffset it might be the Differenz in Adress range not in Value)

 

   b) when k is the y value for placement. I think there is an random.nextInt(...) to much. the correct line must be:

int k = random.nextInt(p_212852_2_.maximum - p_212852_2_.topOffset) + p_212852_2_.bottomOffset;

 

How To test it:

 

only set an Breakpoint on line 19 (int k  = ...) in net.minecraft.world.gen.placement.HeightBiasedRange

and look wat will be happend.

 

For Info: I Worrk with Eclipse, Version 2019-19

 

 

Edited February 27, 20205 yr by wilpito
Wrong Placement Config used

Sorry, I've used the wrong placement.

With Placement.COUNT_RANGE it will work correctly.