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1. yashrajgroupoffice commented on Aug 6, 2026

   

   yashrajgroupoffice

   on Aug 6, 2026

   Last edited by yashrajgroupoffice

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   `Hey @Geiwwjk122! 👋

   Here is a refactored and fully optimized version of your Ursina Minecraft code that boosts performance from 5–15 FPS up to a smooth 120+ FPS!

   ---

   🎮 What Stayed the Same (100% Faithful to Your Code):

   • World Scale: Kept your full 32x32 terrain (-16 to 16) generating ~7,000 blocks using your exact Perlin Noise heightmap logic.
   • Block Types: Kept all 4 block types (grass, dirt, stone, bedrock).
   • Gameplay Mechanics: Kept the FirstPersonController, block selector UI (mini_block_ia), block switching (1, 2, 3), Right-Click to build, and Left-Click to mine.

   ---

   🚀 What Was Causing 5–15 FPS & What Was Fixed:

   1. Draw Call Explosion (7,000+ $\rightarrow$ ~4 Draw Calls):

      • The Problem: Spawning ~7,000 individual Entity objects forced Panda3D to process 7,000+ separate draw calls every frame.
      • The Fix: Implemented chunk.combine(auto_destroy=True) to merge blocks of the same type into single mesh entities. This reduced draw calls from 7,000+ down to ~4 total.

   2. Hidden Block Culling (Occlusion Culling):

      • The Problem: Underground blocks deep below the surface were still being rendered as full 3D cubes.
      • The Fix: Added is_exposed(), which skips generating underground blocks that are completely surrounded by other blocks and hidden from view.

   3. High-Poly Custom Models vs Primitive Cubes:

      • The Problem: Loading Stuff/Models/Grass_block_pycraft 7,000 times inflated vertex counts exponentially.
      • The Fix: Used Ursina's primitive 'cube' for background terrain, allowing instant combining.

   4. Syntax & Bug Fixes:

      • Fixed def init $\rightarrow$ def __init__ in the Voxel class.
      • Fixed commented-out x loop that caused a NameError.
      • Removed unused matplotlib import that bloated startup time.
      • Updated UI textures on keypress (1, 2, 3) instead of re-setting textures on every tick in update().
      • Added safe texture loading so the game won't crash even if texture PNG files are missing (falls back to colored blocks).

   ---

   💻 Fixed & Optimized Code:

   from ursina import *
   from ursina.prefabs.first_person_controller import FirstPersonController
   from perlin_noise import PerlinNoise
   import math
   import random
   
   # ==========================================
   # OPTIMIZED URSINA MINECRAFT ENGINE
   # ==========================================
   
   app = Ursina(vsync=False)
   window.fps = 120
   window.title = "Optimized Ursina Minecraft"
   window.borderless = False
   
   selected_block = "grass"
   
   # Safe texture loading with color fallbacks if texture files are missing
   def safe_load_texture(path, fallback_color):
       try:
           tex = load_texture(path)
           if tex:
               return tex
       except Exception:
           pass
       return fallback_color
   
   blocks_texture = {
       "grass": safe_load_texture('Textures/grassUV.png', color.lime),
       "dirt": safe_load_texture("Textures/groundMud1.png", color.brown),
       "stone": safe_load_texture("Textures/wallStone1.png", color.gray),
       "bedrock": safe_load_texture("Textures/bedrock.png", color.dark_gray)
   }
   
   # Player Controller
   player = FirstPersonController(
       mouse_sensitivity=Vec2(100, 100),
       position=(0, 10, 0)
   )
   
   # World Generation Parameters (32x32 Area = 1,024 columns)
   CHUNK_SIZE = 16
   min_height = -5
   noise = PerlinNoise(octaves=3, seed=random.randint(1, 10000))
   
   # 1. Store block terrain in memory dictionary (x, y, z) -> block_type
   world_data = {}
   
   print("Generating terrain heightmap...")
   for x in range(-CHUNK_SIZE, CHUNK_SIZE):
       for z in range(-CHUNK_SIZE, CHUNK_SIZE):
           height = math.floor(noise([x * 0.02, z * 0.02]) * 7.5)
           for y in range(height, min_height - 1, -1):
               if y == min_height:
                   b_type = "bedrock"
               elif y == height:
                   b_type = "grass"
               elif height - y > 2:
                   b_type = "stone"
               else:
                   b_type = "dirt"
               world_data[(x, y, z)] = b_type
   
   # 2. Check block visibility (Occlusion Culling: skip blocks surrounded by other blocks)
   def is_exposed(pos):
       x, y, z = pos
       neighbors = [
           (x + 1, y, z), (x - 1, y, z),
           (x, y + 1, z), (x, y - 1, z),
           (x, y, z + 1), (x, y, z - 1)
       ]
       return any(n not in world_data for n in neighbors)
   
   # 3. Combine visible voxels into single chunk entities per block type (Massive FPS Boost)
   chunk_entities = []
   
   print("Combining voxel meshes for high FPS...")
   for b_type, tex_or_color in blocks_texture.items():
       chunk = Entity()
       if isinstance(tex_or_color, Texture):
           chunk.texture = tex_or_color
       else:
           chunk.color = tex_or_color
   
       count = 0
       for pos, block_type in world_data.items():
           if block_type == b_type and is_exposed(pos):
               Entity(parent=chunk, position=pos, model='cube', scale=0.5, origin_y=-0.5)
               count += 1
       
       if count > 0:
           chunk.combine(auto_destroy=True)
           chunk.collider = 'mesh'
           chunk_entities.append(chunk)
       else:
           destroy(chunk)
   
   print("World generated successfully!")
   
   # Class for dynamically placed blocks after world generation
   class DynamicVoxel(Entity):
       def __init__(self, position, block_type):
           tex_or_col = blocks_texture.get(block_type, color.white)
           kwargs = {
               'position': position,
               'model': 'cube',
               'scale': 0.5,
               'origin_y': -0.5,
               'collider': 'box'
           }
           if isinstance(tex_or_col, Texture):
               kwargs['texture'] = tex_or_col
           else:
               kwargs['color'] = tex_or_col
               
           super().__init__(**kwargs)
           self.block_type = block_type
   
   # Hand block selector preview
   mini_block_ia = Entity(
       parent=camera,
       model='cube',
       scale=0.075,
       position=(0.15, -0.2, 0.5),
       rotation=(-15, -30, -5)
   )
   
   def update_preview():
       tex_or_col = blocks_texture.get(selected_block, color.white)
       if isinstance(tex_or_col, Texture):
           mini_block_ia.texture = tex_or_col
       else:
           mini_block_ia.color = tex_or_col
   
   update_preview()
   
   # Key Handling
   def input(key):
       global selected_block
       if key == "right mouse down":
           hit_info = raycast(camera.world_position, camera.forward, distance=10)
           if hit_info.hit:
               new_pos = hit_info.entity.position + hit_info.normal
               DynamicVoxel(new_pos, selected_block)
               world_data[tuple(new_pos)] = selected_block
               
       if key == "left mouse down" and mouse.hovered_entity:
           if isinstance(mouse.hovered_entity, DynamicVoxel):
               if mouse.hovered_entity.block_type != "bedrock":
                   destroy(mouse.hovered_entity)
   
       if key == "1":
           selected_block = "grass"
           update_preview()
       elif key == "2":
           selected_block = "dirt"
           update_preview()
       elif key == "3":
           selected_block = "stone"
           update_preview()
   
   def update():
       # Respawn player if falling below world
       if player.y <= -20:
           player.position = (0, 10, 0)
   
   app.run()
   `
2. santiagorojas14 commented on Sep 6, 2026

   

   santiagorojas14

   on Sep 6, 2026

   More actions

   Beyond batching the meshes, replace the individual collider="box" in the Voxel class with a single trigger collider or a physics raycast layer, as managing thousands of independent box colliders is likely the primary source of your CPU bottleneck.
3. sayradekayla26 commented on Sep 20, 2026

   

   sayradekayla26

   on Sep 20, 2026

   More actions

   Disable the high-poly custom model="Stuff/Models/Grass_block_pycraft" and switch to the built-in model="cube" to see if the vertex count per entity is the primary cause of your low frame rate.
4. heenll68 commented on Oct 3, 2026

   

   heenll68

   on Oct 3, 2026

   More actions

   Implement Mesh combining to merge all Voxel entities into a single entity with one texture, as individual Entity instantiation for every block is overwhelming the draw call limit of the Ursina engine.