Class RateUtils.FixedRateCatchUpManager
Implements system update semantics similar to UnityEngine.MonoBehaviour.FixedUpdate.
Namespace: Unity.Entities
Syntax
public class FixedRateCatchUpManager : IRateManagerRemarks
When this mode is enabled on a group, the group updates exactly once for each elapsed interval of the fixed timestep.
For example, assume a fixed timestep of 0.02 seconds. If the previous frame updated at an elapsed time of 1.0 seconds, and the elapsed time for the current frame is now 1.05 seconds, then the system group updates twice in a row: one with an elapsed simulation time of 1.02 seconds, and a second time with an elapsed time of 1.04 seconds. In both cases, the delta time is reported as 0.02 seconds. If the elapsed wall time for the next frame is 1.06 seconds, then the system group doesn't update at all for that frame.
This mode provides the strongest stability and determinism guarantees, and is best suited for systems implementing physics or netcode logic. However, the systems in the group will update at an unreliable rate each frame, and may not update at all if the actual elapsed time is small enough. The running time of systems in this group must therefore be kept to a minimum. If the wall time needed to simulate a single group update exceeds the fixed timestep interval, the group can end up even further behind than when it started, causing a negative feedback loop.
Constructors
| Name | Description |
|---|---|
| FixedRateCatchUpManager(Single) | Construct a new instance |
Properties
| Name | Description |
|---|---|
| Timestep | The timestep since the previous group update (in seconds). |
Methods
| Name | Description |
|---|---|
| ShouldGroupUpdate(ComponentSystemGroup) | Determines whether a system group should proceed with its update, and also how many times it should update per frame. |