- Fixed clouds affecting lighting

- Clouds no longer affect the world heightmap (fixes certain structures generating on clouds)
- Added proper cloud gen beyond just structures
- Fixed mobs spawning on clouds when they shouldn't

src/main/java/com/minelittlepony/unicopia/block/cloud/NaturalCloudBlock.java

@@ -6,6 +6,8 @@ import org.jetbrains.annotations.Nullable;
 
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.SpawnGroup;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.registry.tag.ItemTags;
@@ -16,6 +18,7 @@ import net.minecraft.util.ActionResult;
 import net.minecraft.util.Hand;
 import net.minecraft.util.hit.BlockHitResult;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.BlockView;
 import net.minecraft.world.World;
 
 public class NaturalCloudBlock extends PoreousCloudBlock {
@@ -25,10 +28,23 @@ public class NaturalCloudBlock extends PoreousCloudBlock {
     public NaturalCloudBlock(Settings settings, boolean meltable,
             @Nullable Supplier<Soakable> soggyBlock,
             Supplier<Block> compactedBlock) {
-        super(settings.nonOpaque(), meltable, soggyBlock);
+        super(settings.nonOpaque().allowsSpawning((state, world, pos, type) -> {
+            return type == EntityType.PHANTOM || type == EntityType.PARROT || type.getSpawnGroup() == SpawnGroup.AMBIENT;
+        }), meltable, soggyBlock);
         this.compactedBlock = compactedBlock;
     }
 
+    @Override
+    @Deprecated
+    public float getAmbientOcclusionLightLevel(BlockState state, BlockView world, BlockPos pos) {
+        return 0.9F;
+    }
+
+    @Override
+    public boolean isTransparent(BlockState state, BlockView world, BlockPos pos) {
+        return true;
+    }
+
     @Override
     public ActionResult onUse(BlockState state, World world, BlockPos pos, PlayerEntity player, Hand hand, BlockHitResult hit) {
         ItemStack stack = player.getStackInHand(hand);

src/main/java/com/minelittlepony/unicopia/mixin/MixinHeightmap.java

@@ -0,0 +1,21 @@
+package com.minelittlepony.unicopia.mixin;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.minelittlepony.unicopia.block.cloud.CloudLike;
+
+import net.minecraft.block.BlockState;
+import net.minecraft.world.Heightmap;
+
+@Mixin(Heightmap.class)
+abstract class MixinHeightmap {
+    @Inject(method = "method_16682", at = @At("HEAD"), cancellable = true)
+    private static void excludeCloudsFromWorldSurfaceHeightMap(BlockState state, CallbackInfoReturnable<Boolean> info) {
+        if (state.getBlock() instanceof CloudLike) {
+            info.setReturnValue(false);
+        }
+    }
+}

src/main/java/com/minelittlepony/unicopia/server/world/UWorldGen.java

@@ -7,6 +7,7 @@ import com.minelittlepony.unicopia.Unicopia;
 import com.minelittlepony.unicopia.block.ShellsBlock;
 import com.minelittlepony.unicopia.block.UBlocks;
 import com.minelittlepony.unicopia.server.world.gen.CaveCarvingStructureProcessor;
+import com.minelittlepony.unicopia.server.world.gen.CloudCarver;
 import com.minelittlepony.unicopia.server.world.gen.OverworldBiomeSelectionCallback;
 import com.minelittlepony.unicopia.server.world.gen.SurfaceGrowthStructureProcessor;
 import com.minelittlepony.unicopia.util.registry.DynamicRegistry;
@@ -38,6 +39,9 @@ import net.minecraft.world.biome.OverworldBiomeCreator;
 import net.minecraft.world.biome.SpawnSettings;
 import net.minecraft.world.gen.GenerationStep;
 import net.minecraft.world.gen.blockpredicate.BlockPredicate;
+import net.minecraft.world.gen.carver.Carver;
+import net.minecraft.world.gen.carver.CaveCarverConfig;
+import net.minecraft.world.gen.carver.ConfiguredCarver;
 import net.minecraft.world.gen.feature.ConfiguredFeatures;
 import net.minecraft.world.gen.feature.DefaultBiomeFeatures;
 import net.minecraft.world.gen.feature.Feature;
@@ -126,6 +130,9 @@ public interface UWorldGen {
     StructureProcessorType<SurfaceGrowthStructureProcessor> SURFACE_GROWTH_STRUCTURE_PROCESSOR = Registry.register(Registries.STRUCTURE_PROCESSOR, Unicopia.id("surface_growth"), () -> SurfaceGrowthStructureProcessor.CODEC);
     StructureProcessorType<CaveCarvingStructureProcessor> CAVE_CARVING_STRUCTURE_PROCESSOR = Registry.register(Registries.STRUCTURE_PROCESSOR, Unicopia.id("cave_carving"), () -> CaveCarvingStructureProcessor.CODEC);
 
+    RegistryKey<ConfiguredCarver<?>> OVERWORLD_CLOUD_CARVER_CONFIG = RegistryKey.of(RegistryKeys.CONFIGURED_CARVER, Unicopia.id("overworld_cloud_carver"));
+    Carver<CaveCarverConfig> CLOUR_CARVER = Registry.register(Registries.CARVER, Unicopia.id("cloud"), new CloudCarver(CaveCarverConfig.CAVE_CODEC));
+
     @SafeVarargs
     static <T> T applyAll(T t, Consumer<T> ...consumers) {
         for (Consumer<T> consumer : consumers) {
@@ -142,6 +149,7 @@ public interface UWorldGen {
                 .or(BiomeSelectors.tag(BiomeTags.IS_RIVER))
                 .or(BiomeSelectors.includeByKey(BiomeKeys.STONY_SHORE))
         ), GenerationStep.Feature.VEGETAL_DECORATION, SHELLS_PLACED_FEATURE);
+        BiomeModifications.addCarver(BiomeSelectors.foundInOverworld(), GenerationStep.Carver.AIR, OVERWORLD_CLOUD_CARVER_CONFIG);
         UTreeGen.bootstrap();
 
         OverworldBiomeSelectionCallback.EVENT.register(context -> {

src/main/java/com/minelittlepony/unicopia/server/world/gen/CloudCarver.java

@@ -0,0 +1,142 @@
+package com.minelittlepony.unicopia.server.world.gen;
+
+import java.util.function.Function;
+
+import com.minelittlepony.unicopia.block.UBlocks;
+import com.mojang.serialization.Codec;
+import net.minecraft.block.BlockState;
+import net.minecraft.registry.entry.RegistryEntry;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.ChunkPos;
+import net.minecraft.util.math.MathHelper;
+import net.minecraft.util.math.random.Random;
+import net.minecraft.world.biome.Biome;
+import net.minecraft.world.chunk.Chunk;
+import net.minecraft.world.gen.carver.Carver;
+import net.minecraft.world.gen.carver.CarverContext;
+import net.minecraft.world.gen.carver.CarvingMask;
+import net.minecraft.world.gen.carver.CaveCarver;
+import net.minecraft.world.gen.carver.CaveCarverConfig;
+import net.minecraft.world.gen.chunk.AquiferSampler;
+import net.minecraft.world.gen.densityfunction.DensityFunction.NoisePos;
+
+public class CloudCarver extends CaveCarver {
+
+    private Random random;
+
+    public CloudCarver(Codec<CaveCarverConfig> codec) {
+        super(codec);
+    }
+
+    @Override
+    protected int getMaxCaveCount() {
+        return 15;
+    }
+
+    @Override
+    protected float getTunnelSystemWidth(Random random) {
+        return (random.nextFloat() * 2.0F + random.nextFloat()) * 2.0F;
+    }
+
+    @Override
+    protected double getTunnelSystemHeightWidthRatio() {
+        return 0.5;
+    }
+
+    @Override
+    public boolean carve(
+            CarverContext context,
+            CaveCarverConfig config,
+            Chunk chunk,
+            Function<BlockPos, RegistryEntry<Biome>> function,
+            Random random,
+            AquiferSampler sampler,
+            ChunkPos chunkPos,
+            CarvingMask carvingMask
+        ) {
+        this.random = random;
+        return super.carve(context, config, chunk, function, random, new AquiferSampler() {
+            @Override
+            public BlockState apply(NoisePos pos, double density) {
+                BlockState state = sampler.apply(pos, density);
+                return state != null && state.isAir() ? UBlocks.CLOUD.getDefaultState() : state;
+            }
+
+            @Override
+            public boolean needsFluidTick() {
+                return sampler.needsFluidTick();
+            }
+
+        }, chunkPos, carvingMask);
+    }
+
+    @Override
+    protected void carveCave(
+        CarverContext context,
+        CaveCarverConfig config,
+        Chunk chunk,
+        Function<BlockPos, RegistryEntry<Biome>> posToBiome,
+        AquiferSampler aquiferSampler,
+        double x,
+        double y,
+        double z,
+        float xScale,
+        double yScale,
+        CarvingMask mask,
+        Carver.SkipPredicate skipPredicate
+    ) {
+        if (random == null) {
+            return;
+        }
+        int maxY = context.getMinY() + context.getHeight();
+
+        int bubbleCount = 10 + random.nextInt(12);
+        for (int i = 0; i < bubbleCount; i++) {
+            double width = 1.5 * xScale + random.nextTriangular(3, 2);
+            double height = Math.min(width * yScale * (1 + random.nextFloat() * 2) + MathHelper.sin((float) (Math.PI / 2)) * xScale, maxY - y);
+            double bubbleX = x + (random.nextFloat() * 2 - 1) * width;
+            double bubbleZ = z + (random.nextFloat() * 2 - 1) * width;
+            carveRegion(context, config, chunk, posToBiome, aquiferSampler, bubbleX + 1.0, y, bubbleZ, width, height, mask, skipPredicate);
+        }
+    }
+
+    @Override
+    protected void carveTunnels(
+            CarverContext context,
+            CaveCarverConfig config,
+            Chunk chunk,
+            Function<BlockPos, RegistryEntry<Biome>> posToBiome,
+            long seed,
+            AquiferSampler aquiferSampler,
+            double x,
+            double y,
+            double z,
+            double horizontalScale,
+            double verticalScale,
+            float w,
+            float yaw,
+            float pitch,
+            int branchStartIndex,
+            int branchCount,
+            double yawPitchRatio,
+            CarvingMask mask,
+            Carver.SkipPredicate skipPredicate
+        ) {
+        if (random == null) {
+            return;
+        }
+        int maxY = context.getMinY() + context.getHeight();
+        int bubbleCount = 10 + random.nextInt(12);
+        for (int i = 0; i < bubbleCount; i++) {
+            double width = /*1.5 + MathHelper.sin((float) (Math.PI / 2)) * xScale +*/ 1.5 * horizontalScale + random.nextInt(3) + w;
+            double height = width * (1 + random.nextFloat() * 2) * verticalScale * 0.2;
+            double bubbleX = x + (random.nextFloat() * 2 - 1) * width * 1.5;
+            double bubbleZ = z + (random.nextFloat() * 2 - 1) * width * 1.5;
+            double bubbleY = y + random.nextFloat() * height * 0.5;
+            if (bubbleY + height < maxY) {
+                carveRegion(context, config, chunk, posToBiome, aquiferSampler, bubbleX, bubbleY, bubbleZ, width, height, mask, skipPredicate);
+            }
+        }
+        //super.carveTunnels(context, config, chunk, posToBiome, seed, aquiferSampler, x, y, z, horizontalScale, verticalScale, w, yaw, pitch, branchStartIndex, branchCount, yawPitchRatio, mask, skipPredicate);
+    }
+}

src/main/resources/data/unicopia/worldgen/configured_carver/overworld_cloud_carver.json

@@ -0,0 +1,26 @@
+{
+  "type": "unicopia:cloud",
+  "config": {
+    "probability": 0.05,
+    "y": {
+      "type": "minecraft:uniform",
+      "min_inclusive": {
+        "absolute": 240
+      },
+      "max_inclusive": {
+        "absolute": 600
+      }
+    },
+    "yScale": 0.15,
+    "lava_level": {
+      "above_bottom": 8
+    },
+    "replaceable": "minecraft:air",
+    "horizontal_radius_multiplier": 3.7,
+    "vertical_radius_multiplier": 2.8,
+    "floor_level": {
+      "type": "minecraft:constant",
+      "value": 0
+    }
+  }
+}

src/main/resources/unicopia.mixin.json

@@ -28,6 +28,7 @@
     "MixinFallingBlockEntity",
     "MixinFlowableFluid",
     "MixinGuardianTargetPredicate",
+    "MixinHeightmap",
     "MixinItem",
     "MixinItemEntity",
     "MixinItemStack",