diff --git a/src/closest_polymesh_point.cc b/src/closest_polymesh_point.cc
index 7053093..2f552ce 100644
--- a/src/closest_polymesh_point.cc
+++ b/src/closest_polymesh_point.cc
@@ -15,6 +15,7 @@ vtkIdType findClosestPoint(const double *point, vtkPointSet *pointSet) {
 			minPoint = i;
 		}
 	}
+	std::cerr << "closest: " << minPoint << "\n";
 	return minPoint;
 }
 
diff --git a/src/project_surface_points_on_poly.cc b/src/project_surface_points_on_poly.cc
index 5ae8850..6988c7d 100644
--- a/src/project_surface_points_on_poly.cc
+++ b/src/project_surface_points_on_poly.cc
@@ -48,23 +48,38 @@ void findPointsWithinRadius(double radius, vtkPointSet *pointSet,
 }
 
 
-void ProjectSurfacePointsOnPoly::moveSurfacePoint(vtkUnstructuredGrid *tetMesh,
-                             vtkPolyData *polyMesh,
-                             vtkIdType pointId,
-                             std::vector<double> &motionVectors,
-                             std::vector<unsigned> &numberOfAffectors,
-                             vtkKdTree *polyMeshKdTree,
-                             vtkKdTree *tetMeshKdTree,
-                             vtkStaticCellLinks *links) {
+vtkSmartPointer<vtkIdList> removeSurfacePoints(vtkIdList *list,
+                                               vtkIntArray *isSurface) {
+	vtkNew<vtkIdList> affectedPoints;
+	affectedPoints->Allocate(list->GetNumberOfIds());
+	for (vtkIdType i = 0; i < list->GetNumberOfIds(); i++) {
+		vtkIdType id = list->GetId(i);
+		if (!isSurface->GetValue(id)) {
+			affectedPoints->InsertNextId(id);
+		}
+	}
+	return affectedPoints;
+}
+
+
+void ProjectSurfacePointsOnPoly::moveSurfacePoint(
+		vtkUnstructuredGrid *tetMesh,
+		vtkPolyData *polyMesh,
+		vtkIdType pointId,
+		std::vector<double> &motionVectors,
+		std::vector<unsigned> &numberOfAffectors,
+		vtkKdTree *polyMeshKdTree,
+		vtkKdTree *tetMeshKdTree,
+		vtkStaticCellLinks *links) {
 	double point[3];
 	tetMesh->GetPoint(pointId, point);
 	double direction[3];
 	double distance;
-
 	closestPolyMeshPoint(
 		polyMesh, point, polyMeshKdTree, links, direction, &distance);
-	vtkNew<vtkIdList> affectedPoints;
-	findPointsWithinRadius(distance * RadiusScale, tetMesh, point, affectedPoints);
+	vtkNew<vtkIdList> pointsInRadius;
+	findPointsWithinRadius(distance * RadiusScale, tetMesh, point, pointsInRadius);
+	auto affectedPoints = removeSurfacePoints(pointsInRadius, isSurface);
 	// tetMeshKdTree->FindPointsWithinRadius(distance * RadiusScale, point, affectedPoints);
 
 	if(distance > 0) for (vtkIdType j = 0; j < affectedPoints->GetNumberOfIds(); j++) {
@@ -96,20 +111,13 @@ void ProjectSurfacePointsOnPoly::moveSurfacePoint(vtkUnstructuredGrid *tetMesh,
 
 
 static void applyMotionVectors(vtkUnstructuredGrid *tetMesh,
-                               vtkIdTypeArray *surfacePoints,
                                std::vector<double> &motionVectors,
                                const std::vector<unsigned> &numberOfAffectors) {
 	for (vtkIdType i = 0; i < tetMesh->GetNumberOfPoints(); i++) {
-		bool skip = false;
-		for (vtkIdType j = 0; j < surfacePoints->GetNumberOfTuples(); j++) {
-			if (i == surfacePoints->GetValue(j)) skip = true;
-		}
-		if (skip) continue;
 		if(numberOfAffectors[i] == 0) continue;
 		double point[3];
 		tetMesh->GetPoint(i, point);
 		double *motion = motionVectors.data() + (i * 3);
-
 		vtkMath::MultiplyScalar(motion, 1. / numberOfAffectors[i]);
 		vtkMath::Subtract(point, motion, point);
 		tetMesh->GetPoints()->SetPoint(i, point);
@@ -142,7 +150,9 @@ vtkTypeBool ProjectSurfacePointsOnPoly::RequestData(
 	tetMeshKdTree->BuildLocatorFromPoints(vtkPointSet::SafeDownCast(tetMesh));
 
 	vtkIdTypeArray *surfacePoints =
-		vtkIdTypeArray::SafeDownCast(tetMesh->GetFieldData()->GetArray("surface_points"));
+		vtkIdTypeArray::SafeDownCast(tetMesh->GetFieldData()->GetArray("surfacePoints"));
+	isSurface = vtkIntArray::SafeDownCast(
+		output->GetPointData()->GetArray("isSurface"));
 	std::vector<double> motionVectors(3 * tetMesh->GetNumberOfPoints(), 0);
 	std::vector<unsigned> numberOfAffectors(tetMesh->GetNumberOfPoints(), 0);
 	for (vtkIdType i = 0; i < surfacePoints->GetNumberOfTuples(); i++) {
@@ -153,8 +163,7 @@ vtkTypeBool ProjectSurfacePointsOnPoly::RequestData(
 		                 polyMeshKdTree, tetMeshKdTree,
 		                 links);
 	}
-	applyMotionVectors(tetMesh, surfacePoints,
-	                   motionVectors, numberOfAffectors);
+	applyMotionVectors(tetMesh, motionVectors, numberOfAffectors);
 
 	return true;
 }
diff --git a/src/project_surface_points_on_poly.h b/src/project_surface_points_on_poly.h
index 7c0439c..5e0eb31 100644
--- a/src/project_surface_points_on_poly.h
+++ b/src/project_surface_points_on_poly.h
@@ -25,6 +25,8 @@ public:
 protected:
 	int affectedNeighborsCount = 0;
 	double RadiusScale;
+	vtkIntArray *isSurface = nullptr;
+
 	~ProjectSurfacePointsOnPoly() override = default;
 
 	void moveSurfacePoint(vtkUnstructuredGrid *tetMesh,
diff --git a/src/relaxation_filter.cc b/src/relaxation_filter.cc
index 9e48f26..c658d42 100644
--- a/src/relaxation_filter.cc
+++ b/src/relaxation_filter.cc
@@ -30,7 +30,7 @@ vtkTypeBool RelaxationFilter::RequestData(
 	vtkNew<vtkIdList> neighborCells;
 	vtkNew<vtkIdList> cellPoints;
 	vtkIdTypeArray *surfacePoints = vtkIdTypeArray::SafeDownCast(
-		output->GetFieldData()->GetArray("surface_points"));
+		output->GetFieldData()->GetArray("surfacePoints"));
 	vtkIntArray *isSurface = vtkIntArray::SafeDownCast(
 		output->GetPointData()->GetArray("isSurface"));
 	std::set<vtkIdType> neighbors;
diff --git a/src/surface_points_filter.cc b/src/surface_points_filter.cc
index 2de5261..7d1358b 100644
--- a/src/surface_points_filter.cc
+++ b/src/surface_points_filter.cc
@@ -32,7 +32,7 @@ vtkTypeBool SurfacePointsFilter::RequestData(
 
 	/* Create an array to store the IDs of surface points. */
 	vtkNew<vtkIdTypeArray> surfacePoints;
-	surfacePoints->SetName("surface_points");
+	surfacePoints->SetName("surfacePoints");
 	surfacePoints->SetNumberOfComponents(1);
 	vtkNew<vtkIntArray> isSurface;
 	isSurface->SetName("isSurface");