UBpPoseableMeshComponent C++ code for the Splined Road Youtube Video ( Also see https://www.youtube.com/watch?v=399k219oxi8 )

BpPoseableMeshComponent.cpp

#include "BpPoseableMeshComponent.h"

UBpPoseableMeshComponent::UBpPoseableMeshComponent(const FObjectInitializer& objInitializer) : Super(objInitializer) {

}

void UBpPoseableMeshComponent::SetBoneLocalTransformByName(const FName& boneName, const FTransform& transform) {
    if (!GetSkinnedAsset() || !RequiredBones.IsValid()) {
        return;
    }

    int32 boneIndex = GetBoneIndex(boneName);
    if (boneIndex >= 0 && boneIndex < BoneSpaceTransforms.Num()) {
        BoneSpaceTransforms[boneIndex] = transform;
        MarkRefreshTransformDirty();
    }
}

FTransform UBpPoseableMeshComponent::GetBoneLocalTransformByName(const FName& boneName) {
    FTransform result;
    if (!GetSkinnedAsset() || !RequiredBones.IsValid()) {
        return result;
    }

    int32 boneIndex = GetBoneIndex(boneName);
    if (boneIndex >= 0 && boneIndex < BoneSpaceTransforms.Num()) {
        result = BoneSpaceTransforms[boneIndex];
    }

    return result;
}

void UBpPoseableMeshComponent::UpdatePose() {
    if (!GetSkinnedAsset() || GetNumComponentSpaceTransforms() == 0) {
        return;
    }

    FillComponentSpaceTransforms();
    FinalizeBoneTransform();
    UpdateChildTransforms();
    UpdateBounds();
    MarkRenderTransformDirty();
    MarkRenderDynamicDataDirty();
}

BpPoseableMeshComponent.h

#pragma once

#include "CoreMinimal.h"
#include "Components/PoseableMeshComponent.h"
#include "BpPoseableMeshComponent.generated.h"

UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
class UBpPoseableMeshComponent : public UPoseableMeshComponent {
    GENERATED_BODY()
public:
    UBpPoseableMeshComponent() : UPoseableMeshComponent() { }
    UBpPoseableMeshComponent(const FObjectInitializer& objInitializer);

    UFUNCTION(BlueprintCallable, Category="Components|PoseableMesh")
    void SetBoneLocalTransformByName(const FName& boneName, const FTransform& transform);

    UFUNCTION(BlueprintCallable, Category="Components|PoseableMesh")
    FTransform GetBoneLocalTransformByName(const FName& boneName);

    UFUNCTION(BlueprintCallable, Category="Components|PoseableMesh")
    void UpdatePose();
};