fix fast biomes

doc/rendering/world_renderer.md

@@ -9,7 +9,7 @@
 - 3 Meshes per section (opaque; transparent; translucent)
 - Preparing in nearer to further away order
   - unload meshes if block changed and not in frustum
-  - only prepare if chunk is in frustum
+  - only prepare if chunk is in frust
   - don't prepare empty chunks
 - Light
   - Client side light engine
@@ -40,3 +40,9 @@
   - Greedy meshing
 - Model deciding (for pre flattening versions)
 - Assets manager: Create file from jar with all models inside and load models from there (make them moddable)
+
+
+- ToDo:
+  - Unshelve
+  - Thread safety
+  - Build biome cache only in render distance

src/main/java/de/bixilon/minosoft/data/world/biome/accessor/NoiseBiomeAccessor.kt

@@ -36,7 +36,7 @@ class NoiseBiomeAccessor(private val world: World) {
                     return null
                 }
 
-                return it.data[(biomeY / 4) * 16 + (((z and 0x0F) / 4) * 4 + ((x and 0x0F) / 4))]
+                return it.data[(biomeY and 0x0F) shr 2 and 0x3F shl 4 or ((z and 0x0F) shr 2 and 0x03 shl 2) or ((x and 0x0F) shr 2 and 0x03)]
             }
             return null
         }