Preview: youtube.com/watch?v=sAdYLVvSE_g

The Orbit and Gravity blueprint lets you create gravity sandboxes, place actors in orbit, and perform orbital mechanics calculations.

The orbit system uses Newton’s Law of Gravity to apply a realistic gravitational force affected by distance and a gravitational size parameter. This system can be used to create orbiting bodies in a celestial environment (e.g. a solar system), set the orbit of a spaceship around a planet, or, for games set on the ground, create magnetism and levitation effects on actors (e.g. an anti-gravity floor or pneumatic tube).

• (4.25 Update) ­Lagrange point calculations. Example video: https://www.youtube.com/watch?v=FlfsJ98cwUk

• (5.3 Update) Improved support for large world coordinates.

Features:

• ­Three types of physics calculation modes (kinematic, Kepler, and blend)

• ­Elliptical, Parabolic, and Hyperbolic orbits supported

• ­Orbital prediction based on a future time

• ­50+ orbital mechanics calculations available (e.g. inclination, true anomaly)

• ­Orbits can be nested, for example, a moon orbiting a planet, while a planet orbits a star.

• ­Automatically incorporates player input as acceleration (delta V) if actor is possessed by a player

• ­Physics substepping (kinematic mode)

• ­Configurable time scale; use as real time or with a selected timestep

• ­Easily create projectiles (start velocity can be specified in local space)

• ­Anti­gravity (kinematic only)

• ­Calculate gravity from the center of the actor (e.g. a planet) or from the StaticMesh’s closest point (e.g. e.g. applying effect to a floor or wall)