diff --git a/src/DotRecast.Detour.Extras/Jumplink/AbstractGroundSampler.cs b/src/DotRecast.Detour.Extras/Jumplink/AbstractGroundSampler.cs
index 9b80d30..bc1d249 100644
--- a/src/DotRecast.Detour.Extras/Jumplink/AbstractGroundSampler.cs
+++ b/src/DotRecast.Detour.Extras/Jumplink/AbstractGroundSampler.cs
@@ -7,11 +7,14 @@ namespace DotRecast.Detour.Extras.Jumplink
 {
     public abstract class AbstractGroundSampler : IGroundSampler
     {
-        protected void SampleGround(JumpLinkBuilderConfig acfg, EdgeSampler es, Func<RcVec3f, float, Tuple<bool, float>> heightFunc)
+        public delegate bool ComputeNavMeshHeight(RcVec3f pt, float cellSize, out float height);
+
+        protected void SampleGround(JumpLinkBuilderConfig acfg, EdgeSampler es, ComputeNavMeshHeight heightFunc)
         {
             float cs = acfg.cellSize;
             float dist = (float)Math.Sqrt(RcVec3f.Dist2DSqr(es.start.p, es.start.q));
             int ngsamples = Math.Max(2, (int)Math.Ceiling(dist / cs));
+
             SampleGroundSegment(heightFunc, es.start, ngsamples);
             foreach (GroundSegment end in es.end)
             {
@@ -21,7 +24,7 @@ namespace DotRecast.Detour.Extras.Jumplink
 
         public abstract void Sample(JumpLinkBuilderConfig acfg, RecastBuilderResult result, EdgeSampler es);
 
-        protected void SampleGroundSegment(Func<RcVec3f, float, Tuple<bool, float>> heightFunc, GroundSegment seg, int nsamples)
+        protected void SampleGroundSegment(ComputeNavMeshHeight heightFunc, GroundSegment seg, int nsamples)
         {
             seg.gsamples = new GroundSample[nsamples];
 
@@ -32,12 +35,12 @@ namespace DotRecast.Detour.Extras.Jumplink
                 GroundSample s = new GroundSample();
                 seg.gsamples[i] = s;
                 RcVec3f pt = RcVec3f.Lerp(seg.p, seg.q, u);
-                Tuple<bool, float> height = heightFunc.Invoke(pt, seg.height);
+                bool success = heightFunc.Invoke(pt, seg.height, out var height);
                 s.p.x = pt.x;
-                s.p.y = height.Item2;
+                s.p.y = height;
                 s.p.z = pt.z;
 
-                if (!height.Item1)
+                if (!success)
                 {
                     continue;
                 }
diff --git a/src/DotRecast.Detour.Extras/Jumplink/NavMeshGroundSampler.cs b/src/DotRecast.Detour.Extras/Jumplink/NavMeshGroundSampler.cs
index fdaaa31..4f16dc8 100644
--- a/src/DotRecast.Detour.Extras/Jumplink/NavMeshGroundSampler.cs
+++ b/src/DotRecast.Detour.Extras/Jumplink/NavMeshGroundSampler.cs
@@ -12,7 +12,7 @@ namespace DotRecast.Detour.Extras.Jumplink
         public override void Sample(JumpLinkBuilderConfig acfg, RecastBuilderResult result, EdgeSampler es)
         {
             DtNavMeshQuery navMeshQuery = CreateNavMesh(result, acfg.agentRadius, acfg.agentHeight, acfg.agentClimb);
-            SampleGround(acfg, es, (pt, h) => GetNavMeshHeight(navMeshQuery, pt, acfg.cellSize, h));
+            SampleGround(acfg, es, (RcVec3f pt, float heightRange, out float height) => GetNavMeshHeight(navMeshQuery, pt, acfg.cellSize, heightRange, out height));
         }
 
         private DtNavMeshQuery CreateNavMesh(RecastBuilderResult r, float agentRadius, float agentHeight, float agentClimb)
@@ -42,12 +42,15 @@ namespace DotRecast.Detour.Extras.Jumplink
         }
 
 
-        private Tuple<bool, float> GetNavMeshHeight(DtNavMeshQuery navMeshQuery, RcVec3f pt, float cs, float heightRange)
+        private bool GetNavMeshHeight(DtNavMeshQuery navMeshQuery, RcVec3f pt, float cs, float heightRange, out float height)
         {
+            height = default;
+
             RcVec3f halfExtents = new RcVec3f { x = cs, y = heightRange, z = cs };
             float maxHeight = pt.y + heightRange;
             RcAtomicBoolean found = new RcAtomicBoolean();
             RcAtomicFloat minHeight = new RcAtomicFloat(pt.y);
+
             navMeshQuery.QueryPolygons(pt, halfExtents, filter, new PolyQueryInvoker((tile, poly, refs) =>
             {
                 var status = navMeshQuery.GetPolyHeight(refs, pt, out var h);
@@ -60,12 +63,15 @@ namespace DotRecast.Detour.Extras.Jumplink
                     }
                 }
             }));
+
             if (found.Get())
             {
-                return Tuple.Create(true, minHeight.Get());
+                height = minHeight.Get();
+                return true;
             }
 
-            return Tuple.Create(false, pt.y);
+            height = pt.y;
+            return false;
         }
     }
 }
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