Simulation vs Render Time Scope

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Introduced with Arma 2: Operation Arrowhead version1.60
Introduced with Take On Helicopters version1.00
Introduced with Arma 3 version1.00

Definitions

Simulation Time Scope

Simulation Time Scope is working with the calculated position of objects.

  • It is updated on a lower frequency than the rendered position in order to save performance. [citation needed]
  • Refresh frequency is lowered the further the object is from the camera. [citation needed]

Render Time Scope

Render Time Scope is working with the visual position of objects, which is rendered (estimated) separately from the calculated one.

  • It is updated on a very high frequency (presumably on each frame). [citation needed]
  • The object's position is interpolated depending on its speed and movement direction.
  • Due to interpolation, the position might not be accurate but it is updated frequently, resulting in a smooth motion.
  • Usually, Render Time Scope commands should be used when something is visible to the player, such as UI or on-model precision.


Render Visual Time Scope.gif

Simulation vs Render

For performance concerns, Simulation and Render cycles are separated since Arma 2: Operation Arrowhead v1.60. This means that any object has now "two" positions: the computed one (simulation), and the visual one (render).

Video Showcase

Before Simulation and Render separation

From Operation Flashpoint to Arma 2: Operation Arrowhead v1.59, the simulation first updated the world's state (units position) then the visual rendering was done.
Sequencing these operations worked fine only in non-intensive scenarios; as soon as the CPU reached its limits, the simulation frequency was lowered in order to maintain acceptable FPS, resulting in units visually "jumping".


See Also