Info:

Curve Architect is a general purpose deformation tool for Unity Game engine. It has 3 main features: Mesh deformation, terrain deformation and moving objects/deformations along Architect Curves. All curves can use any of these three features simultaneously.

A video where I explain most of the features in Curve Architect:
https://www.youtube.com/watch?v=NRClnF72tIw

Bugs:
Current known bugs are listed here.

Unity versions:
Works with: Unity 2019, 2020, 2021, 2022 and 2023 with all render pipelines.

Set-up:

Unity 2021, 2022, 2023
Open package manager --> Go to My Assets --> Download and Import Curve Architect --> Press Install/Upgrade

Unity 2020
See: https://www.youtube.com/watch?v=-ZgNTc91NeY or
Window --> Package Manager --> Install the latest collection package --> Import Curve Architect --> Press Skip

Unity 2019
Window --> Package Manager --> In the Advanced drop down menu press "Show preview packages" --> Install the collection 0.9.0-preview.6 package --> Import Curve Architect --> Press Skip

Note: Unity will install the wrong version of the collection package for Unity 2019 and 2020, if you chose to press the Install/Upgrade button. Curve Architect will not work with this version.

Usage:

General
Move, delete, duplicate, rotate, and scale deformations on Architect Curves as you normally would with any GameObject. You can also move deformations/followers between Architect Curves by re-parenting them to another Architect Curve in the hierarchy menu. Unparenting them from an Architect Curve will revert them to the original object. Changing to local orientation will allow the position handle to move objects within the curve space of the Architect Curve. You can also deform prefabs, and prefabs that has hierarchy's within them.

Create deformation:
Parent the object to any Architect Curve or Architect Curve Object. This will automatically generate a new mesh derived from the original mesh that the GameObject had in its Mesh Filter or/and Mesh Collider component.

Remember to have enough vertices on your meshes. Otherwise, they will not look smooth when deformed.

Create follower:
Parent the object to an Architect Curve or Architect Curve Object. After that, select the Game Object and change type to Follower .

Deform terrain:
Select an Architect Curve and press the button with the terrain icon on the bottom of the menu. Place the Architect Curve where you want to deform the terrain. Press "Deform terrain".

Animations:
You can animate any deformation or follower using Unitys built in animations system or script your own behaviors. If you see the small red icon in the upper left corner, you need to enable read/write access for that mesh (only for deformations). Otherwise, you can't animate it.

Find the mesh in your project folder --> check the Read/Write box --> press the apply button.

After enabling Read/Write access you need to update the mesh by moving it or moving the Architect Curve. After that, the icon will disappear.

Menus/Features:

Curve Architect has its own menu and selections system. You have different menus depending on what you have selected. Architect Curves, control points and deformations all have their own with different submenus and settings. Toggle between submenus with the bottom buttons. Some menu items have yellow icons. You can hover over these icons to get information about the specific menu item.

Nearly all functions in Curve Architect can be found within these menus except for shortcuts and the ArchitectCurveCache component (more info about them can be found at the bottom of this post). We will try to explain each feature below by going through all the menus.

Main menu - general:
When you have installed Curve Architect this menu will appear:

This is the main menu and will always be visible if you don't hide it with the "hide" button.

Top buttons:

Create mode | lets you create new Architect Curves or control points on the selected architect curve.
Hide Architect Curves | Hides none selected Architect Curves.
Show help box | Toggle help box on or off.
Show normals | Toggle normals on or off.

General:

Snap length | The snap length for objects attached to an Architect Curve.
Handle type | Change handle movement type from Continuous, Mirrored and Broken.

Main menu - settings:

General:

Curve line resolution | The resolution on all Architect Curve lines.
Normal spacing | How many normals that will be drawn for very 100 meters of an Architect curve.
Enable info icons | Turn on/off info icons (yellow (i) icons).
Mesh save options | Generate meshes at editor startup or save meshes in the scene file. Can greatly reduce the size of the scene files. Generated meshes will still be integrated and exist in the build. However, this can have implications when playing in the editor, especially if you rely on the meshes being available immediately at startup. In such cases, it might be better to avoid generating colliders (if that's what you are dependent on) and instead save them directly in the scene.
Path | Automatically or manually set the path to Curve Architect. Having the wrong path will make menus look broken. They will however still work correctly.

Main menu - info:

General info about Curve Architect.

Architect Curve - deformation:

Will appear when an Architect curve is selected. Settings for deformation type, resolution and color for the Architect Curve.

Top buttons:

Toggle loop | Toggle loop for the selected Architect Curve.
Reverse control points | Reverses the order of all control points.
Flatten control points | Flatten all control points to the same Y value.
Select Architect Curve transform | Selects the Architect Curves transform.
Select all anchors | Selects all the anchors of the Architect Curve.

Deformation:

Deformation Type | Change between static and dynamic deformation. Static curves do not use cached normals and, because of this, consume less memory. They can also be easier to work with since their normals do not change in the same way as those of a dynamic curve. However, dynamic curves are capable of handling more advanced shapes, such as loops.
Normal resolution | The resolution of cached normals. Only used by dynamic Architect Curves.
Position resolution | The resolution of cached positions. You can turn of this feature but you will lose performance by doing that.
Smooth resolution | By default, retrieving positions along a Bezier curve results in uneven spacing due to the bezier curve's nature. Curve Architect includes a smoothing system designed to counteract this, ensuring even distribution of positions across the curve, which prevents deformations from becoming squeezed or elongated. A higher value will increase this effect. You can also completely turn off this feature.
R, G, B, A | Change the color and alpha of the curves control points and unselected line. Selected curve will always have a yellow line.

Architect Curve - terrain:

Will appear when an Architect curve is selected and you have pressed the bottom terrain button. Displays terrain deformation settings and usage.

Terrain:

Range | The range of the architect curve that should deform the terrain.
Width | Width for the terrain deformation.
Blend width | Determines the horizontal extent of terrain deformation, Defining the transition area where the terrain shifts from its original to its deformed state. You can also change its curvature by setting different easings.
Height offset | Extra height added between the curve and terrain.
Cut | Hard stop for terrain deformation at the start or end. This can be useful when deforming curves together.

Architect Curve - info:

General info about the Architect Curve, how much data it takes in memory, length of the curve and so on.

Deformation - general:

Will appear when a deformation is selected.

Top buttons:

Mirror deformation | You can achieve the same deformation effect by scaling negatively, but this approach may cause collision issues in some physics systems. Using the mirror function ensures compatibility across all physics systems without any collision problems.
To center | Sets the x and y position to 0 and also Euler rotation to 0, 0, 0.

General:

Position | Sets the position in curve space.
Rotation | Sets the rotation in curve space.
Type | Change between Deformation, Follower and None.
Normals | Choose between smooth normals, default normals, or opt not to calculate normals. Smooth normals can resolve lighting issues on damaged meshes, but they require significantly more performance to deform.
Tangent | Turn off or on tangent calculations.

Follower - general:

Will appear when a follower is selected.

General:

Position | Sets the position in curve space.
Rotation | Sets the rotation in curve space.
Follow rotation | Only follow specific axles when the object are moved along the Architect Curve. Turning all axles off will improve performance for animations.
Type | Change between Deformation, Follower and None. None objects will behave as normal objects and don't interact with the Architect curve.

Control point - general:

The menu when a control point is selected.

Top buttons:

Flatten control points | Flattens only the selected control segment.
Next control point | Go to next control point.
Prev control point | Go to prev control point.

General:

Position | World position for the selected control point.

Control point - deformation:

Will appear when a control point is selected and the bottom deformation button has been pressed. Has different effects that can be applied to deformations.

Control point - terrain:

Will appear when a control point is selected and the bottom terrain button has been pressed. Has different effects that can be applied to the terrain.

Shortcuts:

Curve Architect has different shortcuts that can be changed in Unitys shortcut menu. Edit --> Shortcuts...

Components:

Architect Curve:
Add this component to any GameObject to create an Architect Curve. The curve type for an Architect Curve is a Bezier curve.

Architect Curve Object:
This component is handled automatically. Will be removed or added when needed. You should not add it manually.

Architect Curve Cache:
Located on the same Game Object as the Architect Curve and manages runtime deformations. Removing it stops all runtime deformations; no cached normals, positions, or length maps will be saved. For curves that do not involve object movement, you should remove this component for better performance and less memory usage.

Curve Architect Data

Curve Architect generates binary files during terrain deformation. These binary files store terrain data, enabling you to revert the terrain back to its original state at any time. If you delete this data, you may experience unwanted 'build-up' of the terrain, and the 'Revert Terrain' button will cease to function.

All of these binary files are located inside the 'CurveArchitectData-YourSceneName' folder. This folder will automatically be created when you deform terrain.

Mesh pooling

Curve Architect tracks all deformed meshes. For example, if a Mesh Filter and a Mesh Collider on the same Game Object use the same original mesh, only one mesh will be created.

Current limitations

~~Architect Curves can’t be scaled (but they can be moved and rotated)~~ You can now scale Architect Curves. Introduced in 1.1.0.
~~You can't deform children to an Architect Curve Object.~~ You can now deform deformations parented to another deformation. Introduced in 1.1.0.
The rotation and position fields in the Inspector can’t be used for moving objects along an Architect Curve, you need to use the position- and rotation fields inside the Curve Architect Menus.
Architect Curves can’t be used inside of prefabs.