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Hi, wouldn’t something like this achieve what everyone wants?
float DistanceInSplineOf(FVector aWorldLocation)
{
float locationInputKey = splineMeshComponent->FindInputKeyClosestToWorldLocation(aWorldLocation);
float segmentEndParameter = locationInputKey / splineMeshComponent->GetNumberOfSplinePoints();//so it's a value between 0 and 1. The spline is a parametrized curve.
GEngine->AddOnScreenDebugMessage(-1, 50.0f, FColor::Orange, FString::Printf(TEXT("Input key nearest to world location: %f"), locationInputKey));
GEngine->AddOnScreenDebugMessage(-1, 50.0f, FColor::Yellow, FString::Printf(TEXT("Segment end parameter: %f."), segmentEndParameter));
float distanceAlongSpline = splineMeshComponent->SplineCurves.GetSegmentLength(0, segmentEndParameter);
//zero represents the start of the spline.
//if you need to calculate distance treating the spline as a closed loop, use:
//splineMeshComponent->SplineCurves.GetSegmentLength(0, segmentEndParameter, true);
GEngine->AddOnScreenDebugMessage(-1, 50.0f, FColor::Green, FString::Printf(TEXT("Distance along spline of a world location: %f"), distanceAlongSpline));
return distanceAlongSpline;
}
Ok, that doesn’t work. Maybe something like this?
float DistanceAlongSplineOf(FVector aWorldLocation)
{
float locationInputKey = splineMeshComponent->FindInputKeyClosestToWorldLocation(aWorldLocation);
int reparametrizationStepsPerSegment = 10;
float distanceAlongSpline = splineMeshComponent->SplineCurves.ReparamTable.Points[FMath::RoundToInt(locationInputKey * reparametrizationStepsPerSegment)].InVal;
//10 is the magic number UE4 uses to make the ReparamStepsPerSegment. It's set at construction and never changed.
//this is based on GetDistanceAlongSplineAtSplinePoint, it uses the same approach.
UE_LOG(LogTemp, Log, TEXT("location: %s."), *aWorldLocation.ToString());
UE_LOG(LogTemp, Log, TEXT("location input key: %f."), locationInputKey);
UE_LOG(LogTemp, Log, TEXT("location distance to spline: %f."), distanceAlongSpline);
return distanceAlongSpline;
}
More accurate:
float DistanceAlongSplineOf(FVector aWorldLocation)
{
float locationInputKey = splineMeshComponent->FindInputKeyClosestToWorldLocation(aWorldLocation);
int32 splinePointFromInputKey = FMath::TruncToInt(locationInputKey);
float remainingSegmentParameter = locationInputKey - splinePointFromInputKey;
float distanceToSplinePoint = splineMeshComponent->GetDistanceAlongSplineAtSplinePoint(splinePointFromInputKey);
float remainingSegmentLength = splineMeshComponent->SplineCurves.GetSegmentLength(splinePointFromInputKey, remainingSegmentParameter, true);
float distanceAlongSpline = distanceToSplinePoint + remainingSegmentLength;
UE_LOG(LogTemp, Log, TEXT("location: %s."), *aWorldLocation.ToString());
UE_LOG(LogTemp, Log, TEXT("location input key: %f."), locationInputKey);
UE_LOG(LogTemp, Log, TEXT("location distance to spline: %f."), distanceAlongSpline);
return distanceAlongSpline;
}
Just in case anyone’s still having an issue finding their distance along a spline in blueprint, here’s a working simple solution:
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Thank mate! That’s gorgeous and makes me understand a bit more about Blueprints (long path ahead).
Thank you so much WillWeaver and Aakrasia for the blueprint examples and everyone who posted earlier in this thread! ~^_^~
The information and examples were a huge help in debugging an issue I was having trying to get a object to snap to a spline upon hit (It worked on straight splines, but was always off on curved ones).
The more accurate methods are a bit above my current skill level (Along with most anything that involves actual code), so I definitely appreciate the simplified blueprint methods that I could use right out of the box! ^_~