I’ve been trying and failing to setup a spline mesh component. It is both rotated and distorted. The mesh I’m using is simply a vertically oriented cylinder, and that’s what I’m expecting when I initially run the game. Instead, this is how it looks:
^Start point and tangent: <0, 0, 0> <0, 0, 0>
End point and tangent: <0, 0, -21><0, 0, 0>
^Start tan<0, 0, 1>
End: <0, 0, -1>
Here’s How I setup the USplineMeshComponent (RelativeRotation defaults to FRotator::ZeroRotator):
void CreateSplineMesh(const FString pathToMesh, FRotator RelativeRotation)
{
USplineMeshComponent* SplineMeshComponent = NewObject<USplineMeshComponent>(this);
// load static mesh
UStaticMesh* LoadedMesh = LoadObject<UStaticMesh>(nullptr, *pathToMesh);
if (!LoadedMesh)
{
UE_LOG(LogTemp, Warning, TEXT("Failed to load mesh at path: %s"), *pathToMesh);
return;
}
SplineMeshComponent->SetStaticMesh(LoadedMesh);
SplineMeshComponent->SetRelativeRotation(RelativeRotation);
SplineMeshComponent->Mobility = EComponentMobility::Movable;
SplineMeshComponent->SetupAttachment(RootComponent);
SplineMeshComponent->RegisterComponent();
SplineMeshComponents.Add(SplineMeshComponent);
}
And I add it to a TArray of USplineMeshComponents so I can iterate through them all on tick. In this iteration I set the start and end points and tangents according to the location and rotation on some sphere colliders. For simplicity, this version just augments the first USplineMeshComponent:
void UpdateSplineMeshes()
{
QBodySegment Segment = BodySegments[0];
USplineMeshComponent* SplineMesh = SplineMeshComponents[Segment.SplineMeshIndex];
UPrimitiveComponent* Joint1 = ColliderComponents[Segment.Joint1Index];
UPrimitiveComponent* Joint2 = ColliderComponents[Segment.Joint2Index];
SplineMesh->SetStartAndEnd(
Joint1->GetComponentLocation() + Joint1->GetComponentRotation().RotateVector(Segment.LocalOffset),
FVector(0.f, 0.f, 0.f) /*Joint1->GetComponentRotation().Vector()*/,
Joint2->GetComponentLocation(),
FVector(0.f, 0.f, 0.f) /*Joint2->GetComponentRotation().Vector()*/
);
}
I commented out my original tangent functions because they weren’t working, but by default their rotation is <0, 0, 0> by default, so it shouldn’t make much of a difference. Start and end points are points at <0, 0, 0> and <0, 0, -21>, so I’ve also tried tangents of <0, 0, 1> and <0, 0, -1> and other combinations of positive and negative unit vectors along the z axis. Changing the tangent certainly changes how screwed up the mesh is, but I still have no idea why the USplineMeshComponent is rotated by default and is so distorted.
