Preserve cave and skylands terrain with Overworld environments

docs/PORTING.md

@@ -248,9 +248,9 @@ honor the server's loaded data packs. Automated coverage also verifies that a
 live Age's seed equals its immutable saved definition; Dynamic Dimensions
 derives both from the Overworld seed and the Age dimension identifier.
 
-Version 0.2.16.11 moves Cave and Island/Skylands Ages onto the standard
-Overworld biome, terrain, surface, structure, and feature pipeline. They no
-longer inherit Nether or End generation and dimension behavior.
+Version 0.2.16.12 gives Cave and Island/Skylands Ages Overworld biomes, sky,
+weather, lighting, and day/night behavior while retaining their distinct
+terrain density: enclosed Nether-shaped caves and End-shaped floating islands.
 
 Version 0.2.14.0 restores the legacy Linking and Descriptive Book artwork for
 inventory items and gives each book its matching open-book texture when placed

gradle.properties

@@ -35,7 +35,7 @@ mod_name=Rivencraft
 # The license of the mod. Review your options at https://choosealicense.com/. All Rights Reserved is the default.
 mod_license=LGPL-3.0-or-later
 # The mod version. Rivencraft uses the x.y.z.b policy documented in README.md.
-mod_version=0.2.16.11
+mod_version=0.2.16.12
 immersive_portals_version=6.0.7
 # The group ID for the mod. It is only important when publishing as an artifact to a Maven repository.
 # This should match the base package used for the mod sources.

src/main/java/net/dnorberg/rivencraft/book/AgeDimensionService.java

@@ -210,12 +210,19 @@ public final class AgeDimensionService {
         var biomeParameters = server.registryAccess()
                 .lookupOrThrow(Registries.MULTI_NOISE_BIOME_SOURCE_PARAMETER_LIST);
         var noiseSettings = server.registryAccess().lookupOrThrow(Registries.NOISE_SETTINGS);
-        ResourceKey<NoiseGeneratorSettings> settingsKey = profile.equals(AgeGenerationProfiles.AMPLIFIED)
-                ? NoiseGeneratorSettings.AMPLIFIED
-                : NoiseGeneratorSettings.OVERWORLD;
-        // Cave and Island/Skylands currently describe an Age's theme. Their
-        // terrain, biomes, surfaces, structures, and features use the standard
-        // Overworld pipeline until their dedicated terrain modifiers land.
+        ResourceKey<NoiseGeneratorSettings> settingsKey;
+        if (profile.equals(AgeGenerationProfiles.CAVE)) {
+            settingsKey = NoiseGeneratorSettings.NETHER;
+        } else if (profile.equals(AgeGenerationProfiles.ISLAND)) {
+            settingsKey = NoiseGeneratorSettings.END;
+        } else if (profile.equals(AgeGenerationProfiles.AMPLIFIED)) {
+            settingsKey = NoiseGeneratorSettings.AMPLIFIED;
+        } else {
+            settingsKey = NoiseGeneratorSettings.OVERWORLD;
+        }
+        // Cave retains enclosed Nether-shaped density and Island/Skylands
+        // retains floating End-shaped density. All profiles use Overworld
+        // biomes and the Overworld dimension type for sky and time behavior.
         // random_vanilla is retained as a migration alias for existing Ages.
         return new NoiseBasedChunkGenerator(
                 MultiNoiseBiomeSource.createFromPreset(