Allow leaves as Age spawn footing

README.md

@@ -36,7 +36,8 @@ independently validates every link.
 Open a page-free Descriptive Book, name its Age, and press Create. Rivencraft
 assigns the book a permanent Age UUID, creates a dedicated vanilla-like runtime
 dimension, and prepares a five-by-five cobblestone arrival platform at the
-highest suitable nearby terrain. If no sturdy surface is available, the
+highest suitable nearby terrain. Solid blocks and tree leaves are valid
+footing. If no suitable surface is available, the
 platform is generated at Y=63. Reopen the book and click its preview to travel.
 Copies of the written book continue to resolve to the same persistent Age
 across server restarts.

docs/PORTING.md

@@ -199,6 +199,9 @@ Version 0.2.10.1 improves Age arrival placement. Non-Nether Ages select the
 highest sturdy surface near the origin and fall back to a platform at Y=63 when
 no suitable natural footing exists.
 
+Version 0.2.10.2 allows leaf blocks to count as proper natural footing when
+selecting the highest arrival surface.
+
 The preview code is separated behind a renderer interface and uses an isolated
 Ponder level populated from server-authoritative destination snapshots.
 

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=0.2.10.1
+mod_version=0.2.10.2
 # 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.
 # See https://maven.apache.org/guides/mini/guide-naming-conventions.html

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

@@ -121,14 +121,16 @@ public final class AgeDimensionService {
 
         for (int x = -SURFACE_SEARCH_RADIUS; x <= SURFACE_SEARCH_RADIUS; x++) {
             for (int z = -SURFACE_SEARCH_RADIUS; z <= SURFACE_SEARCH_RADIUS; z++) {
-                int floorY = level.getHeight(Heightmap.Types.MOTION_BLOCKING_NO_LEAVES, x, z) - 1;
+                int floorY = level.getHeight(Heightmap.Types.WORLD_SURFACE, x, z) - 1;
                 if (floorY < level.getMinBuildHeight() || floorY > maximumFloorY) {
                     continue;
                 }
 
                 BlockPos candidate = new BlockPos(x, floorY, z);
+                var state = level.getBlockState(candidate);
                 if (!level.getFluidState(candidate).isEmpty()
-                        || !level.getBlockState(candidate).isFaceSturdy(level, candidate, net.minecraft.core.Direction.UP)) {
+                        || (!state.is(BlockTags.LEAVES)
+                        && !state.isFaceSturdy(level, candidate, net.minecraft.core.Direction.UP))) {
                     continue;
                 }