> For the complete documentation index, see [llms.txt](https://kinematicsoup.gitbook.io/reactor/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kinematicsoup.gitbook.io/reactor/api-reference/ks.reactor.client/ks.reactor.client.kspredictorutils.md).
# Class ksPredictorUtils
Namespace: [KS.Reactor.Client](/reactor/api-reference/ks.reactor.client.md)\
Assembly: KSUnity.dll
Client-side predictor utility.
```csharp
public class ksPredictorUtils
```
#### Inheritance
[object](https://learn.microsoft.com/dotnet/api/system.object) ↠[ksPredictorUtils](/reactor/api-reference/ks.reactor.client/ks.reactor.client.kspredictorutils.md)
#### Inherited Members
[object.Equals(object)](https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals\(system-object\)), [object.Equals(object, object)](https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals\(system-object-system-object\)), [object.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.object.gethashcode), [object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype), [object.MemberwiseClone()](https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone), [object.ReferenceEquals(object, object)](https://learn.microsoft.com/dotnet/api/system.object.referenceequals), [object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)
## Methods
### ApplyChildTranformUpdates(ksBaseEntity, ksVector3, ksVector3, ksQuaternion, ksQuaternion)
Use old and new transform values to apply predictor changes to entity children.
```csharp
public static void ApplyChildTranformUpdates(ksBaseEntity entity, ksVector3 oldPosition, ksVector3 newPosition, ksQuaternion oldRotation, ksQuaternion newRotation)
```
#### Parameters
`entity` [ksBaseEntity](/reactor/api-reference/ks.reactor.client/ks.reactor.client.ksbaseentity.md)
`oldPosition` [ksVector3](/reactor/api-reference/ks.reactor/ks.reactor.ksvector3.md)
`newPosition` [ksVector3](/reactor/api-reference/ks.reactor/ks.reactor.ksvector3.md)
`oldRotation` [ksQuaternion](/reactor/api-reference/ks.reactor/ks.reactor.ksquaternion.md)
`newRotation` [ksQuaternion](/reactor/api-reference/ks.reactor/ks.reactor.ksquaternion.md)
### ApplyRigidBodyMotion(ksBaseEntity, ksTransformState, float, ksSweepSlideParams)
Applies motion to an entity from rigid body physics, optionally checking for collisions and sliding.
```csharp
public static void ApplyRigidBodyMotion(ksBaseEntity entity, ksTransformState transform, float deltaTime, ksSweepSlideParams sweepSlideParams = null)
```
#### Parameters
`entity` [ksBaseEntity](/reactor/api-reference/ks.reactor.client/ks.reactor.client.ksbaseentity.md)
Entity to apply rigid body motion to.
`transform` [ksTransformState](/reactor/api-reference/ks.reactor/ks.reactor.kstransformstate.md)
Transform to update.
`deltaTime` [float](https://learn.microsoft.com/dotnet/api/system.single)
Amount of time in seconds to simulate.
`sweepSlideParams` [ksSweepSlideParams](/reactor/api-reference/ks.reactor/ks.reactor.kssweepslideparams.md)
If not null and the rigid body is dynamic, checks for collisions using sweep-and-slide movement with these parameters. [Entity](/reactor/api-reference/ks.reactor/ks.reactor.ksoverlapparams.md#KS_Reactor_ksOverlapParams_Entity), ksBasePhysicsQueryParams.ExcludeEntity, ksBasePhysicsQueryParams.Filter, ksBasePhysicsQueryParams.Flags will be overwritten to use simulation filter rules. If [CollideCallback](/reactor/api-reference/ks.reactor/ks.reactor.kssweepslideparams.md#KS_Reactor_ksSweepSlideParams_CollideCallback) is null, a callback will be assigned to eliminate the velocity in the direction of the surface normal.
### UpdateController(ksBaseEntity, ksTransformState, float, float, ksInput)
Updates a `transform` based on a player controller update.
```csharp
public static void UpdateController(ksBaseEntity entity, ksTransformState transform, float unscaledDeltaTime, float timeScale, ksInput input = null)
```
#### Parameters
`entity` [ksBaseEntity](/reactor/api-reference/ks.reactor.client/ks.reactor.client.ksbaseentity.md)
Entity with player controller to update.
`transform` [ksTransformState](/reactor/api-reference/ks.reactor/ks.reactor.kstransformstate.md)
Transform to update.
`unscaledDeltaTime` [float](https://learn.microsoft.com/dotnet/api/system.single)
Delta time in seconds, unscaled by [TimeScale](/reactor/api-reference/ks.reactor/ks.reactor.kstime.md#KS_Reactor_ksTime_TimeScale).
`timeScale` [float](https://learn.microsoft.com/dotnet/api/system.single)
Time scale
`input` [ksInput](/reactor/api-reference/ks.reactor/ks.reactor.ksinput.md)
Input for the controller. If null, the current input will be used.
### UpdateController(ksBaseEntity, float, float, ksInput, PhysicsFlags, int)
```csharp
[Obsolete("Use the overload to update the controller, and ApplyRigidBodyMotion to simulate rigid body physics.")]
public static void UpdateController(ksBaseEntity entity, float unscaledDeltaTime, float timeScale, ksInput input = null, ksPredictorUtils.PhysicsFlags flags = PhysicsFlags.ALL, int maxSweepAndSlideIterations = 4)
```
#### Parameters
`entity` [ksBaseEntity](/reactor/api-reference/ks.reactor.client/ks.reactor.client.ksbaseentity.md)
`unscaledDeltaTime` [float](https://learn.microsoft.com/dotnet/api/system.single)
`timeScale` [float](https://learn.microsoft.com/dotnet/api/system.single)
`input` [ksInput](/reactor/api-reference/ks.reactor/ks.reactor.ksinput.md)
`flags` [ksPredictorUtils](/reactor/api-reference/ks.reactor.client/ks.reactor.client.kspredictorutils.md).[PhysicsFlags](/reactor/api-reference/ks.reactor.client/ks.reactor.client.kspredictorutils/ks.reactor.client.kspredictorutils.physicsflags.md)
`maxSweepAndSlideIterations` [int](https://learn.microsoft.com/dotnet/api/system.int32)