Merged PR 725: Restrict Bounds Control's grab target component to one…

…-handed

Bounds Control was relying on hiding other affordances when starting an
interaction to avoid multiple pointers interacting at the same time.
There was an inconsistency, since `GrabbedAffordances` would only have 1
element when starting both grabs at the same time, while
`BoundsControlGrabbable->GetGrabPointers()` would have 2. Keeping both
components consistent (in that only one handed interaction is allowed
for now) gets rid of this and potentially other issues.

Docs/ReleaseNotes.md

@@ -23,6 +23,7 @@ keywords: Unreal, Unreal Engine, UE4, HoloLens, HoloLens 2, Mixed Reality, devel
   - [UxtMinMaxScaleConstraint is now implicit](#uxtminmaxscaleconstraint-is-now-implicit)
   - [Added UxtManipulatorComponent](#added-uxtmanipulatorcomponent)
   - [Added new Bounds Control presets without constrained affordances](#added-new-bounds-control-presets-without-constrained-affordances)
+  - [BoundsControl configured for one-handed interaction](#boundscontrol-configured-for-one-handed-interaction)
 - [Breaking changes](#breaking-changes)
   - [UxtHandTrackingFunctionLibrary removed](#uxthandtrackingfunctionlibrary-removed)
   - [UxtMathUtilsFunctionLibrary's API update](#uxtmathutilsfunctionlibrarys-api-update)
@@ -124,6 +125,10 @@ This is the new base class for manipulators. It contains common [constraints' lo
 
 The newly added `BoundsControlConstrained.uasset` and `BoundsControlConstrainedWithFaces.uasset` do not include the affordances that are constrained by default in the `BoundsControlExample.umap`, preventing confusion about why they don't rotate.
 
+### BoundsControl configured for one-handed interaction
+
+By default, `UxtGrabTargetComponent` is configured to allow two-handed interaction. Bounds Control only allows interacting with one hand at a time, so it now properly configures its internal `UxtGrabTargetComponent`, getting rid of some undesired situations.
+
 ## Breaking changes
 
 ### `UxtHandTrackingFunctionLibrary` removed

UXToolsGame/Plugins/UXTools/Source/UXTools/Private/Controls/UxtBoundsControlComponent.cpp

@@ -285,6 +285,7 @@ void UUxtBoundsControlComponent::CreateAffordances()
 	BoundsControlActor->SetRootComponent(RootComponent);
 
 	BoundsControlGrabbable = NewObject<UUxtGrabTargetComponent>(BoundsControlActor);
+	BoundsControlGrabbable->GrabModes = static_cast<int32>(EUxtGrabMode::OneHanded);
 	BoundsControlGrabbable->RegisterComponent();
 	BoundsControlActor->AddInstanceComponent(BoundsControlGrabbable);