Adjust structure chance in LOD.

follow-up to 2bc1292

src/server/terrain/chunkgen/StructureGenerator.zig

@@ -56,7 +56,6 @@ pub fn generate(worldSeed: u64, chunk: *main.chunk.ServerChunk, caveMap: CaveMap
 						model.generate(px, py, relZ, chunk, caveMap, &seed);
 						break;
 					} else {
-						// Make sure that after the first one was considered all others get the correct chances.
 						randomValue -= model.chance;
 					}
 				}
@@ -77,15 +76,14 @@ pub fn generate(worldSeed: u64, chunk: *main.chunk.ServerChunk, caveMap: CaveMap
 				var randomValue = random.nextFloat(&seed);
 				const biome = biomeMap.getBiome(px, py, relZ);
 				for(biome.vegetationModels) |model| { // TODO: Could probably use an alias table here.
-					var adaptedChance = model.chance;
+					var adaptedChance = model.chance/16;
 					// Increase chance if there are less spawn points considered. Messes up positions, but at that distance density matters more.
 					adaptedChance = 1 - std.math.pow(f32, 1 - adaptedChance, @as(f32, @floatFromInt(chunk.super.pos.voxelSize*chunk.super.pos.voxelSize)));
 					if(randomValue < adaptedChance) {
 						model.generate(px - 16, py - 16, relZ, chunk, caveMap, &seed);
 						break;
 					} else {
-						// Make sure that after the first one was considered all others get the correct chances.
-						randomValue = (randomValue - adaptedChance)/(1 - adaptedChance);
+						randomValue -= adaptedChance;
 					}
 				}
 			}