Startup Problems and Crashes

Initial Settings


Saving and Sharing Designs

Steam Workshop - Link


Build Mode

Place Mode

Edit Mode

Resource Count


Rust Import/Export



Fortify Links

Discord Channel / Subreddit / Steam Community Hub

Feedback is always welcome!

Startup Problems and Crashes

There have been cases where you need to restart Steam after first installing Fortify for it to work.

Check this out if you’re still experiencing issues:

Older Computer Crash Fix - Switching to DirectX 9

If you experience frequent crashes check the output_log file in the fortify_data folder.

If you see lines like the one below try using "-force-d3d9" in the steam launch options.

d3d11: failed to create buffer

Initial Settings

Some controls and shortcuts can be customized under the input tab.

Lower the graphics settings here if using an older computer or building a ridiculously large base.

The mouse cursor needs to over the highlighted area to set a control to a mouse button.


esc - open or close main menu

F12 - take a screenshot

Q / E / scroll wheel - rotate / flip parts while placing or when selected

Hold alt while rotating to only rotate in small increments

R, backspace, or delete - remove highlighted part

click doors/hatches to open close, hasn’t been added for all frame parts yet

hold down the mouse wheel to half snap foundations


Can be customized in initial settings for AZERTY keyboards

Invert Y-Axis is available under Options

W/S - forward and back

A/D - pan left and right

Hold right click to rotate the camera

Hold shift to speed up all camera movement

Space/left Ctrl - move the camera up and down

Z - zoom on object or terrain that the mouse is over

I - Interior Camera Mode, the top toggle slows the camera down and the bottom prevents it from going through walls.

Saving and Sharing Designs

Save As only saves files in the main saves folder.

Subfolders can be added but the files need to be moved manually. Reopen the menu to refresh the file list.

The Save button will save to wherever the file was loaded from.

The saves folder can be opened with this button. The only way to delete saves are through your OS.

It’s a good idea to backup your saves folder occasionally.

Clipboard Export allows you to copy the save data to your clipboard.

Some web services have a character limit which could result in incomplete save data if pasting into a message.

That’s why is a good choice and you can get automatic links with this button:

The generated link is copied to your clipboard for sharing.

The Fortify subreddit has lots of posted designs that are shared this way.

Submit your own unique designs for feedback. Warning: You may get downvoted for no good reason.

Importing from Pastebin

Copy the “RAW Paste Data” (Ctrl+A to select all) and then use Clipboard Import.

Cloud Saves

Steam Workshop - Link

The workshop allows for a better system to organize, rate, browse and share designs with the Fortify community or friends.

- subscribed and published items are listed at the bottom of the panel, click the “Subscribed Items” label to switch between

- click one of the listed items to download and open, this will replace the current scene

- published items can take a minute to show up in the workshop

- items can be set to friends only on the item page

- tags can't be changed or added after publishing, not sure why steam limits this

- adding a description after publishing is possible on the item page


Tab switches between the Build and Place panel.

Changing Scenes

Pick from the list and reset.

Merge Saves

Copy contents from a file into the current scene.

Left click to place the contents, it can be rotated while moving around.

Importing a huge base or a 3D terrain save with foundations at different heights might not give you the best results.

Removing Parts

Highlight part and press R, backspace, or delete. Same goes for parts selectionsparts in Edit mode.

Restores last deleted part or parts.


Plan your build in stages. Click the panel to show stage colors.

Any new part will use the stage number displayed. Change selections to a certain stage with "set".

Using the select button and "selection only" in resource count is helpful.

Hide Floors / Hide Stages - Press F

Press the curved arrow to switch between modes.

Hidden floor parts still have active colliders to prevent overlapping.

Page up and down are the shortcuts to adjust the level.

< Click this tab to jump to the first floor/stage.

The sync button will sync the current toggle state in multiplayer.

Building Tiers

Toggle the tier used for new parts while in Build mode or click to change the current selection in Edit Mode.

Press mouse4 to quickly change tiers. Key can be customized.

Allow Overlap

Parts can intersect freely.

Certain parts can now break Rust rules and be placed on the ground or on floors/foundations.

Add Codes

Select doors while in Edit mode to use this. Multiple doors/hatches can be set at once.

Mousing over the door will show the code.

Build Mode


Wall parts can replace other walls without deleting (change a wall to a window).

Press 1-7 part shortcuts repeatedly to cycle through groups, like floor and floor tri.

Swapping similar parts can also be done with mouse3.

Doors and roofs will flip sides while placing with Q / E.

Stairs and Hatches can be rotated after placing with Q / E.

Strong/Weak Side

All wall parts have a strong and weak side, use Q / E to flip while selected.

While placing press Q / E to change if the strong or weak is facing the camera.

    weak                 strong

Extend Tool

Add multiple parts in one direction. Works with foundations, walls, wall frames, and pillars.

The tool does check for overlapping parts or if foundations are underground.

Automatic Window Parts 

Code locks 

Click to disable adding code locks to every new door.

Place Mode

Edit Mode

MouseOver Selection

Default selection mode, left click to add to selection or hold mouse over parts while holding left click to add, hold alt to remove from selection.

Rectangle Selection

Press M or to toggle.

Hold down mouse wheel to use this tool without having to toggle it.

Hold Alt or Ctrl - remove or add to the selection.

Disables up/down movement.


Level Selection Tools

Goes through every level with a selected part and adds or removes from the current selection.

Going left to right: selects everything, only floors,  only wall parts, and any part types that were in the original selection.

Add Level

Select foundations or floors first. The top option outlines and the other honeycombs the selection with walls.

Floors will be placed above if the bottom “include floors” toggle is enabled (on by default).

Copy Level

Will copy any selected building part (includes frame parts) one level up.

Copy Structure

Selection must contain a foundation. Rotate with Q / E / scroll wheel.



First select the parts you want to align/move (must contain a foundation).

Click on the target edge you want the parts aligned with.

Lastly choose the edge of the selection you want aligned to the target.

Align tool in action: 

This tool doesn’t prevent overlapping where the two structures come together.

Resource Count

Will only show the count for visible floors.

The other tier toggles show the cost if every building part is changed to that tier.

Click the panel to update the count.


Press the % button to toggle stability calculation while building.

Stability Mode saves a temporary copy of your scene, this will reload when exiting this mode.

Most deployables are removed in this mode, this might be improved in the future.

Destruction Mode


The cannon ball knocks out parts in the hit radius.

Mouse over parts while using C4 to see the health.

Rust Import/Export

This option saves and loads .json files that are configured to work with the Copy-Paste oxide plugin.

Get the plugin and more info here:

Try it out with your own server:

< click to switch to loading/saving .json files


Once your server is setup add the json files to the copypaste folder:

server > "your server name" > oxide > data > copypaste > example_base.json

You might need to create the copypaste folder.

Then type in chat: /paste example_base

Filenames with spaces need to be in quotes: /paste "example base"

Undo placement: /undo 

Adjust the height (1 is default): /paste example_base height 2   


 /copy example_base

The building part you are directly looking at will be at zero elevation in the save (so look at a foundation).

The file will end up in the location mentioned above. Copy the file to your Fortify saves location.

Click the menu folder icon above the file list to open the saves folder.

Opening in Fortify

If the base loads partly underground use rectangle selection and the copy tool in edit mode.


Limited to 4 player for now and uses steamworks P2P networking.

Host and send invites to friends, the person needs to be in Fortify when accepting.

The host’s scene is sent to the joiner at the start. Save before joining.

If repeated connection attempts fail it might have to do with this: Required Ports for Steamworks P2P


If saves won’t open, users will need to add LC_ALL=C %command% to the launch options.

This is in Steam Library > Fortify (right click) > Properties > Set Launch Options.

This prevents decimals being replaced with commas in the save data.