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Conversion of physical units

Bartłomiej Dzieńkowski edited this page Aug 19, 2021 · 3 revisions

The XVP implementation was designed to take the advantage of SI units assuming the game engine supports them too (like Unity). However, the Unreal Engine uses centimetres instead of metres, which affects the distance, force, torque, and inertia units. Unit conversions would bring inconsistency and impact the performance, so we expect Epic Games will address the problem at some point in the future. As a temporary solution, we have a unit conversion table to help you navigate between SI and UE units.

Type SI unit UE unit
distance 1 m 100 cm
linear velocity 1 m / s 100 cm / s
angular velocity 1 rad / s 1 rad / s
mass 1 kg 1 kg
inertia 1 kg m^2 10000 kg (cm)^2
linear force 1 N 100 kg cm / s^2
torque 1 Nm 10000 kg (cm)^2 / s^2
linear acceleration 1 m / s^2 100 cm / s^2
angular acceleration 1 rad / s^2 1 rad / s^2

Angle properties have Rad or Deg postfixes to distinguish between Radians and Euler degrees.