From 9c28d134db2441b6c92eefdb839a8b68d1f8fb7c Mon Sep 17 00:00:00 2001
From: Ken Pruiksma <pruiksma@amazon.com>
Date: Fri, 5 Nov 2021 10:40:34 -0500
Subject: [PATCH] Fix for alignment issue with terrain heights. (#5274)

Signed-off-by: Ken Pruiksma <pruiksma@amazon.com>
---
 Gems/Terrain/Assets/Shaders/Terrain/TerrainCommon.azsli | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Gems/Terrain/Assets/Shaders/Terrain/TerrainCommon.azsli b/Gems/Terrain/Assets/Shaders/Terrain/TerrainCommon.azsli
index 72c1af953c..cd680f721a 100644
--- a/Gems/Terrain/Assets/Shaders/Terrain/TerrainCommon.azsli
+++ b/Gems/Terrain/Assets/Shaders/Terrain/TerrainCommon.azsli
@@ -218,9 +218,10 @@ float4x4 GetObject_WorldMatrix()
 
 float GetHeight(float2 origUv)
 {
-    float2 uv = clamp(origUv + (ObjectSrg::m_terrainData.m_uvStep * 0.5f), 0.0f, 1.0f);
-    float height = 0.0f;
+    float2 halfStep = ObjectSrg::m_terrainData.m_uvStep * 0.5;
+    float2 uv = origUv * (1.0 - ObjectSrg::m_terrainData.m_uvStep) + halfStep;
 
+    float height = 0.0f;
     if (o_useTerrainSmoothing)
     {
         float2 textureSize;