Add 7. Collision and GLB Export

7.-Collision-and-GLB-Export.md

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+# Collision and GLB Export
+
+This page defines collision and export requirements for NETFISHING assets.
+
+## Collision policy
+
+Do not include collision unless the related issue requests it.
+
+When collision is required, use a separate simplified object.
+
+Naming:
+
+- `AssetName_Visual`
+- `AssetName_Collision`
+
+## Collision guidelines
+
+Collision should:
+
+- Be simpler than the visual model
+- Remove small details
+- Use broad surfaces
+- Avoid narrow triangles
+- Avoid small holes
+- Avoid invisible ledges
+- Match the visible shape closely enough for gameplay
+
+Suggested collision approaches:
+
+| Asset | Suggested collision |
+|---|---|
+| Tree | Cylinder or capsule |
+| Small rock | Convex |
+| Large rock | Simplified convex mesh |
+| Building | Boxes around walls and footprint |
+| Dock | Box collision |
+| Bench | Simple box |
+| Reeds | None |
+| Grass | None |
+| Mushroom | None |
+| Terrain | Simplified terrain collision mesh |
+
+Do not use detailed trimesh collision for every prop.
+
+## Export format
+
+Export models as:
+
+    glTF Binary (.glb)
+
+Recommended settings:
+
+- Format: `glTF Binary (.glb)`
+- Include: `Selected Objects`
+- Apply Modifiers: enabled
+- Export scale: `1.0`
+- Materials: enabled
+- Cameras: disabled
+- Lights: disabled
+- Animations: enabled only when requested
+
+## Before export
+
+Confirm:
+
+- Only intended objects are selected
+- Reference objects are excluded
+- Rotation is applied
+- Scale is applied
+- Object scale is `1,1,1`
+- Normals face outward
+- Origins are intentional
+- Names are descriptive
+- No cameras are included
+- No lights are included
+- No missing textures exist
+
+Apply rotation and scale using:
+
+    Ctrl+A → Rotation & Scale
+
+## Godot import validation
+
+After export, test the GLB in Godot.
+
+Confirm:
+
+- It imports without errors
+- It appears at the expected scale
+- The root scale remains `1,1,1`
+- Materials render correctly
+- Shading is correct
+- Normals are correct
+- Origins behave correctly
+- Collision behaves as requested
+- No unwanted cameras appear
+- No unwanted lights appear
+- No unexpected animations appear
+- No external files are missing
+
+Always inspect the model from the actual gameplay camera distance.