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+---
+title: 3D models
+sidebar_position: 3
+---
+
+# 3D models
+
+## Conception in blender
+
+### View statistics (number triangles / objects)
+
+In blender, you can see the number of triangles, click on *viewport overlays*, and click on *statictics*, you can now see the statistics.
+
+![Viewport overlays](./static_files/blender_viewport_overlays.png)
+
+![display statictics](./static_files/blender_display_statistics.png)
+
+
+### One mesh
+
+Each .blend file must have only 1 mesh, or 1 logical group.
+
+This avoids "who touched what" conflicts in version control.
+
+### LOD (Level Of Detail) management
+
+In the goal to keep performance in the game, we need to have 4 LOD.
+
+One you have created your mesh, rename it with the suffix *_LOD0*.
+
+Duplicate it with *alt + D* or in menu *Object* > *Duplicate Linked* and rename it with suffix *_LOD1*.
+Repeat the duplicate for *_LOD2* and *_LOD3_*.
+
+On _LOD1, _LOD2 and _LOD3, add the modifier *Decimate*. Apply the ratio like this table:
+
+
+| LOD | Decimate Ratio | Triangle target |
+|-----|----------------|-----------------|
+| LOD0 | 1.0 — no decimate | 100% |
+| LOD1 | 0.5 | ~50% |
+| LOD2 | 0.15–0.2 | ~15–20% |
+| LOD3 | 0.05 | ~5% |
+
+
+### textures
+
+:::danger
+**Never** embed textures inside the .blend, keep them as sidecar files so they can be updated without opening Blender
+:::
+
+This is the procedure to manage textures:
+
+**When adding a texture the first time**, in the Shader Editor, add an *Image Texture* node → click *Open* → navigate to your `assets_blender/.../` folder and select the `.png` file there. Blender will store a relative path automatically as long as the `.blend` has already been saved once alongside the textures.
+
+**Check a texture is external (not packed)**: look at the Image Texture node header. If you see a small floppy disk icon with a dot on it, the image is packed. If it shows just the filename, it's external.
+
+**To unpack an already-packed texture:**
+
+1. Go to *File* → *External Data* → *Unpack Resources*
+2. Choose *"Write files to current directory"* (this places them next to the `.blend`)
+3. Then move them to your proper `assets_blender/…/` folder and re-link (see [Files Structure page](../files_structure))
+
+**To re-link a texture after moving it:** In the Image Texture node, click the folder icon next to the image name → navigate to the new path. Or use *File* → *External Data* → *Find Missing Files* to bulk-fix broken paths across all materials at once.
+
+**Make all paths relative** (important for team/version control): go to *File* → *External Data* → *Make All Paths Relative*. This converts all absolute `/home/you/project/...` paths to `//relative/...` paths, so the `.blend` works on any machine as long as the folder structure is preserved.
+
+The simplest rule: **textures live in the same folder as their `.blend`, or in a subfolder of it**. For your structure that means:
+
+- assets_blender/structures/buildings/houses/
+  - house_colonial_2f.blend
+  - tex_house_colonial_2f_albedo.png
+  - tex_house_colonial_2f_normal.png
+  - tex_house_colonial_2f_roughness.png
+
+
+### Export to Godot
+
+Once finished, export for Godot.
+
+**`File > Export > glTF 2.0 (.glb/.gltf)`**
+
+Choose the format **glTF Binary (`.glb`)** (single file, everything packed in. Best for most use cases).
+
+
+This is the recommended Settings Panel:
+
+#### 🔵 Include
+
+| Option | Setting |
+|---|---|
+| **Limit to** | Selected Objects (if you don't want the whole scene) |
+| **Data > Mesh** | ✅ UVs, Normals, Vertex Colors |
+| **Data > Armature** | ✅ Export Deformation Bones Only |
+| **Data > Skinning** | ✅ Enable |
+
+If your model contains blend shapes (shape keys / morph targets), the **Data > Armature > Export Deformation Bones Only** option must be enabled — exporting non-deforming bones will lead to incorrect shading in Godot.
+
+
+#### 🟢 Transform
+
+| Option | Setting |
+|---|---|
+| **+Y Up** | ✅ **Enable this** — Godot uses Y-up, Blender uses Z-up |
+
+You can check **Transform > +Y Up** and other options from the built-in glTF exporter panel.
+
+#### 🟡 Geometry / Mesh
+
+| Option | Setting |
+|---|---|
+| **Apply Modifiers** | ✅ Enable (bakes modifiers into the mesh) |
+| **Normals** | ✅ Enable |
+| **UVs** | ✅ Enable |
+| **Vertex Colors** | ✅ if used |
+| **Compression (Draco)** | ❌ Avoid — Godot doesn't support Draco decompression natively |
+
+
+#### 🟠 Animation (if exporting animated objects)
+
+| Option | Setting |
+|---|---|
+| **Animation** | ✅ Enable |
+| **Export NLA Strips** | ✅ Enable — this separates animations by name in Godot |
+| **Bake Animation** | ✅ Enable if you have complex drivers or constraints |
+| **Sampling Rate** | 1 (default is fine) |
+| **Optimize Animation** | ✅ Recommended |
+
+When exporting with animations, use **NLA Strips** mode — each strip in the NLA Editor becomes a separately named animation track in Godot, which is what allows the AnimationPlayer to recognize them individually.
+
+
+#### 🔴 Before Exporting — Critical Checklist
+
+1. **Apply all transforms** (`Ctrl+A > All Transforms`) on both mesh and armature. Incorrect scale or rotation on an armature is the #1 cause of weird deformation issues in-engine.
+2. **Check origin points** — objects floating in Godot is often caused by a misplaced origin in Blender.
+3. **Materials**: Use **Principled BSDF** nodes. The exporter supports Metal/Rough PBR (core glTF) and Shadeless (KHR_materials_unlit) materials, and constructs a glTF material based on the nodes it recognizes in the Blender material.
+4. **Textures** must be in PNG or JPEG format — other formats are auto-converted on export.
+
+#### Tip: Save as Export Preset
+
+Once you've configured everything, click the **➕ operator preset button** at the top of the export panel to save these settings as a reusable preset (e.g., "Godot Export"). This avoids reconfiguring every time.
+
+
+## Import in Godot
+
+Once 3d model exported, open godot, you will have the file with extension *.glb*.
+
+Open it, and you will have the import window.
+
+On *Scene*, be sure to uncheck *Generate LODs*.
+
+On each MeshInstance3D with the suffix *_LOD0*, *_LOD1*, *_LOD2* and *_LOD3*, set the right fields (*Visibility Range Begin* and *Visibility Range End*):
+
+| Category | Examples | LOD0 | LOD1 | LOD2 | LOD3 |
+|----------|----------|------|------|------|------|
+| **Tiny** | coins, bolts, leaves | 0–0.5m | 0.5–2m | 2–5m | 5-8m |
+| **Small** | cups, rocks, bottles | 0–1m | 1–5m | 5–15m | 15-25m |
+| **Medium** | chairs, barrels, crates | 0–5m | 5–20m | 20–50m | 50-80m |
+| **Large** | cars, trees, statues | 0–15m | 15–40m | 40–80m | 80-150m |
+| **Huge** | buildings, terrain chunks | 0–30m | 30–80m | 80–200m | 200-400m |
+| **Massive** | mountains, skybox elements | 0–100m | 100–300m | 300–800m | 800-1500m |
+
+Then click on *Import* or *Reimport* button.
+
+
+**Practical Tips**
+
+- **Transparent / alpha objects** (leaves, fences) switch to a **flat billboard** at LOD2 or LOD3
diff --git a/docs/creativeConcept/files_structure.md b/docs/creativeConcept/files_structure.md
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+---
+title: Files structure
+sidebar_position: 2
+---
+
+# Folders and files organisation
+
+All files will be set in the [main / game repository](https://github.com/DyingStar-game/DyingStar).
+
+
+## Organisation for game
+
+Inside we have 3D blender exported models (gltf files), textures...
+
+```
+- assets/
+  - _universe/
+    - environment/
+      - space/
+        - stations/
+          - station_orbital_elevator_base.glb
+          - station_orbital_elevator_base.tresmaterial
+        - asteroids/
+      - terrain/
+        - rocks/
+        - cliffs/
+    - structures/
+      - megastructures/
+        - megastr_orbital_elevator_cable.glb
+        - megastr_orbital_elevator_anchor.glb
+      - industrial/
+        - mines/
+          - mine_entrance_large.glb
+          - mine_shaft_segment.glb
+        - refinery/
+      - urban/
+        - cities/
+          - city_block_dense_a.glb
+        - villages/
+          - village_house_rural_sm.glb
+      - buildings/
+        - houses/
+          - house_colonial_2f.glb
+    - props/
+      - furniture/
+        - furn_table_wood_lg.glb
+        - furn_chair_office.glb
+      - tools/
+      - containers/
+    - vehicles/
+      - spaceship/
+        - ship_freighter_class_a.glb
+      - ground/
+    - characters/
+      - humanoids/
+      - creatures/
+    - _shared/
+      - materials/
+      - shaders/
+  - planets
+    - tarsis_4
+      - structures/
+        - buildings/
+          - houses/
+            - house_sandstone_dome.glb
+      - environment/
+        - vegetation/
+          - veg_tree_01.glb
+      - props/
+        - containers/
+          - prop_water_cistern_aridis.glb
+      - _shared/
+        - materials/
+- scenes
+  - _universe/
+    - environment/
+      - space/
+        - stations/
+          - station_orbital_elevator_base.tscn
+        - asteroids/
+      - terrain/
+        - rocks/
+        - cliffs/
+    - structures/
+      - megastructures/
+        - megastr_orbital_elevator.tscn
+      - industrial/
+        - mines/
+          - mine.tscn
+        - refinery/
+      - urban/
+        - cities/
+          - city_block_dense_a.tscn
+        - villages/
+          - village_house_rural_sm.tscn
+      - buildings/
+        - houses/
+          - house_colonial_2f.tscn
+    - props/
+      - furniture/
+        - furn_table.tscn
+        - furn_chair.tscn
+      - tools/
+      - containers/
+    - vehicles/
+      - spaceship/
+        - ship_freighter_class_a.tscn
+      - ground/
+    - characters/
+      - humanoids/
+      - creatures/
+  - planet
+    - biome_xxx
+    - planet_data.gd
+  - systems
+    - tarsis
+      - tarsis_4.tscn
+      - tarsis_4
+        - structures/
+          - buildings/
+            - houses/
+              - house_sandstone_dome.tscn
+        - environment/
+          - vegetation/
+            - veg_tree_01.tscn
+        - props/
+          - containers/
+            - prop_water_cistern_aridis.tscn
+- server
+- test
+```
+
+
+## Organisation for Blender files
+
+```
+- assets_blender/
+  - _wip/ (for models not yet ready to export)
+  - _universe/
+    - environment/
+      - space/
+        - stations/
+          - station_orbital_elevator_base.blend
+          - tex_station_orbital_elevator_base_albedo.png
+          - tex_station_orbital_elevator_base_normal.png
+        - asteroids/
+      - terrain/
+        - rocks/
+        - cliffs/
+    - structures/
+      - megastructures/
+        - megastr_orbital_elevator_cable.blend
+        - megastr_orbital_elevator_anchor.blend
+      - industrial/
+        - mines/
+          - mine_entrance_large.blend
+          - mine_shaft_segment.blend
+        - refinery/
+      - urban/
+        - cities/
+          - city_block_dense_a.blend
+        - villages/
+          - village_house_rural_sm.blend
+      - buildings/
+        - houses/
+          - house_colonial_2f.blend
+    - props/
+      - furniture/
+        - furn_table_wood_lg.blend
+        - furn_chair_office.blend
+      - tools/
+      - containers/
+    - vehicles/
+      - spaceship/
+        - ship_freighter_class_a.blend
+      - ground/
+    - characters/
+      - humanoids/
+      - creatures/
+    - _shared/
+      - materials/
+      - hdri/
+  - planets/
+    - tarsis_4/
+      - structures/
+        - buildings/
+          - houses/
+            - house_sandstone_dome.blend
+      - environment/
+        - vegetation/
+          - veg_tree_01.blend
+        - props/
+          - containers/
+            - prop_water_cistern_aridis.blend
+        - _shared/
+          - materials/
+```
+
+## Naming convention
+
+The pattern is: [category_prefix]_[descriptor]_[variant/size].[ext]
+
+| Part | Rule | Examples |
+| ---- | ---- | -------- |
+| Category prefix | Short noun identifying the type | ship_, mine_, furn_, megastr_, city_, village_, house_, char_ |
+| Descriptor | snake_case, most specific noun first | freighter_class_a, entrance_large, table_wood_lg |
+| Variant/size | Optional suffix: sm/md/lg, a/b/c, v2, damaged | _sm, _a, _damaged |
+| Extension | .blend in source, .glb + optional .tscn/.tres in Godot | — |
+
+
+
+
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