From 199b235fdc2a0dbf827459f02c6fae342df83f6d Mon Sep 17 00:00:00 2001
From: Sean Lilley <lilleyse@gmail.com>
Date: Tue, 27 Nov 2018 21:31:40 -0500
Subject: [PATCH 1/2] Fix visibility check

---
 Source/Scene/Cesium3DTileset.js          | 3 +++
 Source/Scene/Cesium3DTilesetTraversal.js | 5 ++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/Source/Scene/Cesium3DTileset.js b/Source/Scene/Cesium3DTileset.js
index 8b394390f0b6..c374c278f179 100644
--- a/Source/Scene/Cesium3DTileset.js
+++ b/Source/Scene/Cesium3DTileset.js
@@ -187,6 +187,7 @@ define([
         this._selectedTilesToStyle = [];
         this._loadTimestamp = undefined;
         this._timeSinceLoad = 0.0;
+        this._updatedVisibilityFrame = 0;
         this._extras = undefined;
 
         this._cullWithChildrenBounds = defaultValue(options.cullWithChildrenBounds, true);
@@ -1944,6 +1945,8 @@ define([
             tileset._cache.reset();
         }
 
+        ++tileset._updatedVisibilityFrame;
+
         var ready;
 
         if (isAsync) {
diff --git a/Source/Scene/Cesium3DTilesetTraversal.js b/Source/Scene/Cesium3DTilesetTraversal.js
index e9c0a0e962fe..c206ac8a31b1 100644
--- a/Source/Scene/Cesium3DTilesetTraversal.js
+++ b/Source/Scene/Cesium3DTilesetTraversal.js
@@ -217,14 +217,14 @@ define([
     }
 
     function updateVisibility(tileset, tile, frameState) {
-        if (tile._updatedVisibilityFrame === frameState.frameNumber) {
+        if (tile._updatedVisibilityFrame === tileset._updatedVisibilityFrame) {
             // Return early if visibility has already been checked during the traversal.
             // The visibility may have already been checked if the cullWithChildrenBounds optimization is used.
             return;
         }
 
         tile.updateVisibility(frameState);
-        tile._updatedVisibilityFrame = frameState.frameNumber;
+        tile._updatedVisibilityFrame = tileset._updatedVisibilityFrame;
     }
 
     function anyChildrenVisible(tileset, tile, frameState) {
@@ -470,7 +470,6 @@ define([
             visitTile(tileset, tile, frameState);
             touchTile(tileset, tile, frameState);
             tile._refines = refines;
-            tile._updatedVisibilityFrame = 0; // Reset so visibility is checked during the next pass which may use a different camera
         }
     }
 

From 6520c1474d6d7b1b376293f43537176ac41e37fc Mon Sep 17 00:00:00 2001
From: Sean Lilley <lilleyse@gmail.com>
Date: Tue, 4 Dec 2018 11:04:06 -0500
Subject: [PATCH 2/2] Updated CHANGES.md

---
 CHANGES.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CHANGES.md b/CHANGES.md
index 33a24e094fee..e8b43135cda3 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,11 @@
 Change Log
 ==========
 
+### 1.53 - 2019-01-02
+
+##### Fixes :wrench:
+* Fixed 3D Tiles visibility checking when running multiple passes within the same frame. [#7289](https://github.com/AnalyticalGraphicsInc/cesium/pull/7289)
+
 ### 1.52 - 2018-12-03
 
 ##### Breaking Changes :mega: