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diff --git a/TestProjects/HDRP_Tests/Assets/ReferenceImages/Linear/WindowsEditor/Vulkan/None/1224_Lit_Tesselation_Culling.png b/TestProjects/HDRP_Tests/Assets/ReferenceImages/Linear/WindowsEditor/Vulkan/None/1224_Lit_Tesselation_Culling.png
new file mode 100644
index 00000000000..3e535eb4402
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+++ b/TestProjects/HDRP_Tests/Assets/ReferenceImages/Linear/WindowsEditor/Vulkan/None/1224_Lit_Tesselation_Culling.png
@@ -0,0 +1,3 @@
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new file mode 100644
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+++ b/TestProjects/HDRP_Tests/Assets/ReferenceImages/Linear/WindowsEditor/Vulkan/None/1224_Lit_Tesselation_Culling.png.meta
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diff --git a/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset b/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset
index 0d41d4d287e..48ab39900e9 100644
--- a/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset
+++ b/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset
@@ -89,6 +89,9 @@ EditorBuildSettings:
   - enabled: 1
     path: Assets/GraphicTests/Scenes/1x_Materials/1223_Lit_Iridescence.unity
     guid: b447fc323b2e7604e9404972d093fb77
+  - enabled: 1
+    path: Assets/GraphicTests/Scenes/1x_Materials/1224_Lit_Tesselation_Culling.unity
+    guid: e6dbeb027fe017c41839dd2fcfc728f3
   - enabled: 1
     path: Assets/GraphicTests/Scenes/1x_Materials/1301_StackLitSG.unity
     guid: eefb6e7ceaa685442bbf61fd2b82f9ae
diff --git a/com.unity.render-pipelines.core/CHANGELOG.md b/com.unity.render-pipelines.core/CHANGELOG.md
index 357ab1c1284..285502dcbe3 100644
--- a/com.unity.render-pipelines.core/CHANGELOG.md
+++ b/com.unity.render-pipelines.core/CHANGELOG.md
@@ -18,6 +18,10 @@ The version number for this package has increased due to a version update of a r
 - Fixed ACES tonemaping for Nintendo Switch by forcing some shader color conversion functions to full float precision.
 - Fixed a bug in FreeCamera which would only provide a speed boost for the first frame when pressing the Shfit key.
 
+## Added
+- New function in GeometryTools.hlsl to calculate triangle edge and full triangle culling.
+
+
 ## [10.2.0] - 2020-10-19
 
 Version Updated
diff --git a/com.unity.render-pipelines.core/ShaderLibrary/GeometricTools.hlsl b/com.unity.render-pipelines.core/ShaderLibrary/GeometricTools.hlsl
index 99784432eed..c9e2e149ce0 100644
--- a/com.unity.render-pipelines.core/ShaderLibrary/GeometricTools.hlsl
+++ b/com.unity.render-pipelines.core/ShaderLibrary/GeometricTools.hlsl
@@ -234,9 +234,12 @@ bool CullTriangleFrustum(float3 p0, float3 p1, float3 p2, float epsilon, float4
 // Returns 'true' if the edge of the triangle is outside of the frustum.
 // The edges are defined s.t. they are on the opposite side of the point with the given index.
 // 'epsilon' is the (negative) distance to (outside of) the frustum below which we cull the triangle.
-bool3 CullTriangleEdgesFrustum(float3 p0, float3 p1, float3 p2, float epsilon, float4 frustumPlanes[6], int numPlanes)
+//output packing:
+// x,y,z - one component per triangle edge, true if outside, false otherwise
+// w - true if entire triangle is outside of at least 1 plane of the frustum, false otherwise
+bool4 CullFullTriangleAndEdgesFrustum(float3 p0, float3 p1, float3 p2, float epsilon, float4 frustumPlanes[6], int numPlanes)
 {
-    bool3 edgesOutside = false;
+    bool4 edgesOutsideXYZ_triangleOutsideW = false;
 
     for (int i = 0; i < numPlanes; i++)
     {
@@ -244,13 +247,26 @@ bool3 CullTriangleEdgesFrustum(float3 p0, float3 p1, float3 p2, float epsilon, f
                                     DistanceFromPlane(p1, frustumPlanes[i]) < epsilon,
                                     DistanceFromPlane(p2, frustumPlanes[i]) < epsilon);
 
-        // If both points of the edge are behind any of the planes, we cull.
-        edgesOutside.x = edgesOutside.x || (pointsOutside.y && pointsOutside.z);
-        edgesOutside.y = edgesOutside.y || (pointsOutside.x && pointsOutside.z);
-        edgesOutside.z = edgesOutside.z || (pointsOutside.x && pointsOutside.y);
+        bool3 edgesOutside;
+            // If both points of the edge are behind any of the planes, we cull.
+        edgesOutside.x = pointsOutside.y && pointsOutside.z;
+        edgesOutside.y = pointsOutside.x && pointsOutside.z;
+        edgesOutside.z = pointsOutside.x && pointsOutside.y;
+
+        edgesOutsideXYZ_triangleOutsideW = edgesOutsideXYZ_triangleOutsideW || bool4(edgesOutside.xyz, all(pointsOutside));
     }
 
-    return edgesOutside;
+    return edgesOutsideXYZ_triangleOutsideW;
+}
+
+// Returns 'true' if the edge of the triangle is outside of the frustum.
+// The edges are defined s.t. they are on the opposite side of the point with the given index.
+// 'epsilon' is the (negative) distance to (outside of) the frustum below which we cull the triangle.
+//output packing:
+// x,y,z - one component per triangle edge, true if outside, false otherwise
+bool3 CullTriangleEdgesFrustum(float3 p0, float3 p1, float3 p2, float epsilon, float4 frustumPlanes[6], int numPlanes)
+{
+    return CullFullTriangleAndEdgesFrustum(p0, p1, p2, epsilon, frustumPlanes, numPlanes).xyz;
 }
 
 bool CullTriangleBackFaceView(float3 p0, float3 p1, float3 p2, float epsilon, float3 V, float winding)
diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index ce192f7464e..c569133be04 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -50,6 +50,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed LayerMask editor for volume parameters.
 - Fixed the condition on temporal accumulation in the reflection denoiser (case 1303504).
 - Fixed box light attenuation.
+- Fixed tesselation culling, big triangles using lit tesselation shader would dissapear when camera is too close to them (case 1299116)
 
 ### Changed
 - Removed the material pass probe volumes evaluation mode.
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDataMeshModification.hlsl b/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDataMeshModification.hlsl
index 7ea5f75fe58..2151286da7a 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDataMeshModification.hlsl
+++ b/com.unity.render-pipelines.high-definition/Runtime/Material/Lit/LitDataMeshModification.hlsl
@@ -62,14 +62,14 @@ float4 GetTessellationFactors(float3 p0, float3 p1, float3 p2, float3 n0, float3
     // TODO: the only reason I test the near plane here is that I am not sure that the product of other tessellation factors
     // (such as screen-space/distance-based) results in the tessellation factor of 1 for the geometry behind the near plane.
     // If that is the case (and, IMHO, it should be), we shouldn't have to test the near plane here.
-    bool3 frustumCullEdgesMainView = CullTriangleEdgesFrustum(p0, p1, p2, frustumEps, _FrustumPlanes, 5); // Do not test the far plane
+    bool4 frustumCullEdgesMainView = CullFullTriangleAndEdgesFrustum(p0, p1, p2, frustumEps, _FrustumPlanes, 5); // Do not test the far plane
 #else
     // During the scene picking pass, we have no access to camera frustum planes
-    bool3 frustumCullEdgesMainView = false;
+    bool4 frustumCullEdgesMainView = false;
 #endif
 
 #if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_SHADOWS)
-    bool frustumCullCurrView = all(frustumCullEdgesMainView);
+    bool frustumCullCurrView = frustumCullEdgesMainView.w;
 #else
     bool frustumCullCurrView = CullTriangleFrustum(p0, p1, p2, frustumEps, _ShadowFrustumPlanes, 4); // Do not test near/far planes
 #endif