Custom Forces and Gravity

A package that adds various tools which allow you to control forces and gravity in your unity scenes like never before!

Check out the package here: https://github.com/westonwright/forces-and-gravity-unity

Force Producers

Force Producers calculate the force applied to a point in space depending on the type of producer.
Producers can individually apply a different type of force (Force, Acceleration, Impulse, VelocityChange) and can use additive or weighted blending to mix with other producers.
You can create arbitrary types of ‘force’ and decide how you want them to affect objects in your scene through your own code or built-in systems. These custom forces can also selectively mix with other custom forces and use Layer Masks for further specification.

All Force Producers inherit from the ‘ForceProducer’ class and have some variables in common:

Preview

Displays a Gizmo for the producer being displayed and its falloff. Changes Color based on Force Type and if the force is enabled.

Enable Force

Togglable enables or disables producers from applying forces.

Force Type

Determines which force type to apply from this producer. Force Types are Scriptable Objects which give some information about how they should behave. There are 4 included with the package but it is easy to create more to fit your needs.

Layer Mask

Which layers to apply forces to.

Force Strength

The strength of the forces being applied.

Importance

Used to order producers for mixing and overwriting. The order of importance is (low to high): 1 to Infinity, then -1 to -Infinity, the 0 at the lowest importance.

Additive

Toggles if this producer mixes with other producers. If True, it will always apply its force instead of mixing with other producers.

Invert

Toggles if the direction of force should be inverted. Can be used to push objects away instead of pulling them in.

Currently, there are 5 types of Producers in addition to the base class:

Force Surface

Creates forces based on a ‘Shape’ component. We’ll cover shapes later. Force is determined by the distance from the surface and normal data from the Shape.

Unique Variables:

Force Range

Determines how far from the surface of the mesh the full strength force will reach.

Falloff Range

Determines how far out falloff reaches. Falloff creates a smooth transition from full-strength to 0-strength based on distance from the producer.

Force Collider

This is functionally the same as the Force Surface but uses Unity’s built-in colliders to define its shape. This works with all types of colliders.

Force Zone

Creates a force in one direction within an area defined by a ‘Shape’.

Unique Variables:

Force Direction

The direction in which force will be applied within this zone. Normalized at runtime.

Force Point

Applies a force towards a single point in space with an inner radius and falloff. The inner range is determined by scale.

Force Global

Creates a force in one direction for the entire scene.

(very good gif)

Unique Variables:

Force Direction

The direction in which force will be applied within this zone. Normalized at runtime.

Shapes

Shapes are components you can add to game objects to define an area or surface where forces should be applied. Shapes can either be pre-defined 3D objects with SDF and other properties, or can be a Mesh. It should be possible to create your own custom shapes to fit your needs if necessary. All shapes handle drawing their own Gizmos and creation of Bounding Boxes for culling.

Currently, there are 5 Shapes including an unusable base class: