correct the hand mesh yaw rotation inside the sgpawn after the squat/sgvect3d changes

Source/SenseGlove/Private/SenseGlove/GameFramework/SGPawn.cpp

@@ -50,6 +50,8 @@
 #include "SenseGlove/Components/SGWristTrackerComponent.h"
 #include "SGLog/SGLog.h"
 
+static constexpr float SG_HAND_MESH_YAW_CORRECTION_OFFSET = -90.0f;
+
 struct ASGPawn::FImpl
 {
     /************************
@@ -201,7 +203,7 @@ ASGPawn::ASGPawn(const FObjectInitializer& ObjectInitializer)
     HandLeft->SetCollisionResponseToChannel(ECC_Destructible, ECR_Block);
     HandLeft->SetRight(false);
     HandLeft->SetHiddenIfNoGloveDetected(true);
-    HandLeft->SetRelativeRotation(FRotator{0.0f, -90.0f, 0.0f},
+    HandLeft->SetRelativeRotation(FRotator{0.0f, SG_HAND_MESH_YAW_CORRECTION_OFFSET, 0.0f},
                                   false, nullptr, ETeleportType::None);
     HandLeft->SetRelativeLocation(FVector{30.0f, -20.0f, -10.0f},
                                   false, nullptr, ETeleportType::None);
@@ -225,7 +227,7 @@ ASGPawn::ASGPawn(const FObjectInitializer& ObjectInitializer)
     RealHandLeft->SetRight(false);
     Pimpl->SetVisibility(RealHandLeft, false);
     RealHandLeft->SetHiddenIfNoGloveDetected(true);
-    RealHandLeft->SetRelativeRotation(FRotator{0.0f, -90.0f, 0.0f},
+    RealHandLeft->SetRelativeRotation(FRotator{0.0f, SG_HAND_MESH_YAW_CORRECTION_OFFSET, 0.0f},
                                       false, nullptr, ETeleportType::None);
     RealHandLeft->SetRelativeLocation(FVector{30.0f, -20.0f, -10.0f},
                                       false, nullptr, ETeleportType::None);
@@ -428,7 +430,7 @@ ASGPawn::ASGPawn(const FObjectInitializer& ObjectInitializer)
     HandRight->SetCollisionResponseToChannel(ECC_Destructible, ECR_Block);
     HandRight->SetRight(true);
     HandRight->SetHiddenIfNoGloveDetected(true);
-    HandRight->SetRelativeRotation(FRotator{0.0f, -90.0f, 0.0f},
+    HandRight->SetRelativeRotation(FRotator{0.0f, SG_HAND_MESH_YAW_CORRECTION_OFFSET, 0.0f},
                                    false, nullptr, ETeleportType::None);
     HandRight->SetRelativeLocation(FVector{30.0f, 20.0f, -10.0f},
                                    false, nullptr, ETeleportType::None);
@@ -452,7 +454,7 @@ ASGPawn::ASGPawn(const FObjectInitializer& ObjectInitializer)
     RealHandRight->SetRight(true);
     Pimpl->SetVisibility(RealHandRight, false);
     RealHandRight->SetHiddenIfNoGloveDetected(true);
-    RealHandRight->SetRelativeRotation(FRotator{0.0f, -90.0f, 0.0f},
+    RealHandRight->SetRelativeRotation(FRotator{0.0f, SG_HAND_MESH_YAW_CORRECTION_OFFSET, 0.0f},
                                        false, nullptr, ETeleportType::None);
     RealHandRight->SetRelativeLocation(FVector{30.0f, 20.0f, -10.0f},
                                        false, nullptr, ETeleportType::None);
@@ -1829,20 +1831,24 @@ void ASGPawn::FImpl::UpdateHandRotation(const bool bRight, const FRotator& Rotat
 
 void ASGPawn::FImpl::UpdateLeftHandRotation(const FRotator& Rotation, const bool bUpdateVirtualHand)
 {
+    static const FQuat Offset{FQuat::MakeFromEuler(FVector{0.0f, 0.0f, SG_HAND_MESH_YAW_CORRECTION_OFFSET})};
+    const FQuat NewRotation{Rotation.Quaternion() * Offset};
     if (bUpdateVirtualHand)
     {
-        Owner->HandLeft->SetWorldRotation(Rotation);
+        Owner->HandLeft->SetWorldRotation(NewRotation);
     }
-    Owner->RealHandLeft->SetWorldRotation(Rotation);
+    Owner->RealHandLeft->SetWorldRotation(NewRotation);
 }
 
 void ASGPawn::FImpl::UpdateRightHandRotation(const FRotator& Rotation, const bool bUpdateVirtualHand)
 {
+    static const FQuat Offset{FQuat::MakeFromEuler(FVector{0.0f, 0.0f, SG_HAND_MESH_YAW_CORRECTION_OFFSET})};
+    const FQuat NewRotation{Rotation.Quaternion() * Offset};
     if (bUpdateVirtualHand)
     {
-        Owner->HandRight->SetWorldRotation(Rotation);
+        Owner->HandRight->SetWorldRotation(NewRotation);
     }
-    Owner->RealHandRight->SetWorldRotation(Rotation);
+    Owner->RealHandRight->SetWorldRotation(NewRotation);
 }
 
 void ASGPawn::FImpl::UpdateHandLocationAndRotation(