English version of the docs

Author: fernanditicus

Docs/Realistic_F1_track_creation_en.md

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+# Creating Custom Worlds and Circuits in Blender
+
+## Download and Install the GIS Addon
+
+First, you need to download and install the **GIS Addon** in Blender. To do so:
+
+1. Go to the official GitHub repository of the addon.
+2. Navigate to the **Releases** section and download the `.zip` file.
+3. **Do not unzip** the `.zip` file.
+
+In Blender:
+
+1. Go to `Edit -> Preferences -> Add-ons -> Install`.
+2. Select the downloaded `.zip` file.
+
+---
+
+## Creating the Terrain
+
+1. Open the **GIS** menu (toolbar in the viewport).
+2. Go to: `GIS -> Web Geodata -> Basemap`.
+3. Choose `Google`, then `Satellite`, and click **OK**.
+4. A world map will appear, where you can select the desired area.  
+   > It's recommended to keep the terrain under **5 km** in both width and height.
+5. Press **B** to make a precise selection of the area.
+6. Press **E** to delete the rest of the terrain.
+
+---
+
+## Adding Elevation
+
+1. With the terrain selected, go to the **GIS** menu and choose `Get elevation`.
+2. Select the source **Marine-geo.org GMRT**.
+3. This will apply elevation to the terrain using modifiers.
+
+> Apply the modifiers **from bottom to top** to convert the terrain into a mesh.
+
+To increase mesh resolution:
+
+- Add a **Subdivision** modifier.
+- Adjust it until the size of the terrain blocks is about twice the width of the road or less.
+
+---
+
+## Creating the Road
+
+1. Create a **Path-type curve** at the starting point of the track.
+2. Enable **Face Project** in the snapping tool so the curve conforms to the terrain. Move the curve closer to the terrain if needed.
+3. Switch to **Edit Mode** and start adding and adjusting curve points to follow the desired track layout.
+4. In the `Object Data Properties` panel:
+   - Set `Twist Method` to **Z-Up**.
+5. Disable snapping once you're done.
+
+---
+
+## Option 1: Road on Top of Terrain
+
+1. Create a **generic block** to represent the asphalt.  
+   > If you want guardrails along the track, include them in this block.
+
+   - The block width should match the road width.
+   - The length can be roughly half the width.
+
+2. Place this block at the starting point of the track.
+3. Add the following **modifiers** to the block:
+   - **Array**: To duplicate the block along the path.
+   - **Curve**: To make the block follow the curve.
+   - **Solidify**: To give thickness to the asphalt.
+
+   Make sure to:
+   - Enable **Merge** in the Array modifier.
+   - Assign the curve to the **Curve** modifier.
+
+4. Adjust the curve to avoid floating or sunken areas.
+5. Apply the modifiers and texture the road as desired.
+
+---
+
+## Option 2: Road Included in the Terrain
+
+> This method creates a single mesh but may result in **N-gons** (polygons with more than 4 sides).
+
+1. Follow the initial block creation steps, **without adding Solidify**.
+2. Save the **Z-coordinate** of the road block.
+3. Slightly elevate the road so it sits completely above the terrain.
+4. Select the terrain and enter **Edit Mode**.
+5. In **Top View**:
+   - Click on the road object.
+   - In the `Mesh` menu, use **Knife Project**.
+
+6. In the `Vertex Groups` section:
+   - Create a new group and assign the projected selection to it.
+7. Deselect the road using `Ctrl + Click` and press `Delete` to remove the faces.
+8. Return to **Object Mode** and move the road back to its original Z-coordinate.
+
+9. Add a **Shrinkwrap** modifier to the road:
+   - `Target`: The terrain mesh.
+   - `Vertex Group`: The group you created.
+   - `Wrap Method`: **Nearest Vertex**.
+
+10. Apply the modifiers and texture the road as desired.
+
+---
+
+## Final Notes
+
+- Save copies of your project before applying important modifiers.
+- You can export the track for use in engines like Unity or simulators like Gazebo.
+
+---
+
+## Useful Links
+
+- [Blender GIS Addon (GitHub)](https://github.com/domlysz/BlenderGIS)
+- [Marine Geoscience Data System (GMRT)](https://www.marine-geo.org/tools/maps_grids.php)