Add Blender Setup and Scale

Blender-Setup-and-Scale.md

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+# Blender Setup and Scale
+
+NETFISHING uses the following scale convention:
+
+- 1 Blender unit = 1 meter
+- 1 Godot unit = 1 meter
+
+A model exported at the correct scale should normally import into Godot with a scale of:
+
+    X: 1
+    Y: 1
+    Z: 1
+
+If an imported model must be scaled to `0.01`, `100`, or another corrective value, the source file is probably configured incorrectly.
+
+## Blender unit settings
+
+In Blender:
+
+1. Open **Scene Properties**
+2. Open **Units**
+3. Set:
+   - Unit System: `Metric`
+   - Unit Scale: `1.0`
+   - Length: `Meters`
+
+## Axis conventions
+
+Blender uses:
+
+- X: left and right
+- Y: forward and backward
+- Z: up and down
+
+Godot uses:
+
+- X: left and right
+- Z: forward and backward
+- Y: up and down
+
+GLB/glTF handles the axis conversion automatically.
+
+Do not rotate the complete Blender scene to compensate for Godot’s coordinate system.
+
+## Blender default cube
+
+The default Blender cube is:
+
+    2 m × 2 m × 2 m
+
+Its vertices are one meter away from the origin in each direction.
+
+Scaling the default cube by five creates a ten-meter-wide cube, not a five-meter-wide cube.
+
+For precise environment modeling, enter exact dimensions in the Item panel.
+
+Open the Item panel with:
+
+    N
+
+Then edit the values under **Dimensions**.
+
+## Applying transforms
+
+Before export:
+
+1. Select the model
+2. Press `Ctrl+A`
+3. Choose **Rotation & Scale**
+
+The final object scale should normally be:
+
+    X: 1.000
+    Y: 1.000
+    Z: 1.000
+
+## Scale-reference collection
+
+Contributors should create a non-exported Blender collection named:
+
+    REFERENCE
+
+Recommended contents:
+
+- Player reference
+- One-meter cube
+- Door reference
+- Five-meter path
+- Ten-meter measuring strip
+- Water-level reference
+
+Suggested sizes:
+
+| Object | Approximate size |
+|---|---:|
+| Player | 1.5–1.8 m tall |
+| Door | 0.9–1.1 m wide |
+| Door height | 2–2.2 m |
+| Comfortable path | 3–5 m wide |
+| Multiplayer fishing bank | 3–4 m per player |
+| Small dock | 3–5 m wide |
+| Dock post | 0.2–0.4 m thick |
+| Bench | 1.5–2 m wide |
+| Small rock | 0.4–0.8 m wide |
+| Large rock | 1.5–3 m wide |
+| Mushroom | 0.15–0.5 m tall |
+| Small tree | 4–6 m tall |
+| Large stylized tree | 7–10 m tall |
+| One-story shop | 3–5 m tall |
+
+Third-person spaces should generally be wider than real-world equivalents.
+
+A realistic one-meter path will feel cramped when several players and a third-person camera must use it.
+
+## Scale-testing workflow
+
+Before creating a major asset, test the intended scale in Godot.
+
+A useful scale-test scene contains:
+
+- One-meter cube
+- Player reference
+- Two-meter doorway
+- Five-meter-wide path
+- Five-meter tree
+- Small dock section
+
+Export the scene as GLB and compare it directly to the real player and gameplay camera.
+
+The working rule is:
+
+> Measure in Blender. Judge in Godot.