From 971753cbad93c656f85f808a243a32a8368b49e4 Mon Sep 17 00:00:00 2001
From: Sean Lilley <lilleyse@gmail.com>
Date: Sat, 26 Sep 2020 12:39:43 -0400
Subject: [PATCH] Fix shadow crash by preventing shadowNear from equaling
 shadowFar

---
 CHANGES.md                | 1 +
 Source/Scene/ShadowMap.js | 6 ++----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index fcfa67f43159..fb451197a1c0 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -12,6 +12,7 @@
 - Fixed an issue where Plane doesn't rotate correctly around the main local axis. [#8268](https://github.com/CesiumGS/cesium/issues/8268)
 - Fixed clipping planes with non-uniform scale. [#9135](https://github.com/CesiumGS/cesium/pull/9135)
 - Fixed an issue where ground primitives would get clipped at certain camera angles. [#9114](https://github.com/CesiumGS/cesium/issues/9114)
+- Fixed a crash when loading Cesium OSM buildings with shadows enabled. [#9172](https://github.com/CesiumGS/cesium/pull/9172)
 
 ### 1.73 - 2020-09-01
 
diff --git a/Source/Scene/ShadowMap.js b/Source/Scene/ShadowMap.js
index 458f61835938..7a6138faf62a 100644
--- a/Source/Scene/ShadowMap.js
+++ b/Source/Scene/ShadowMap.js
@@ -1518,10 +1518,8 @@ function updateCameras(shadowMap, frameState) {
       frameState.shadowState.nearPlane,
       shadowMap.maximumDistance
     );
-    far = Math.min(
-      frameState.shadowState.farPlane,
-      shadowMap.maximumDistance + 1.0
-    );
+    far = Math.min(frameState.shadowState.farPlane, shadowMap.maximumDistance);
+    far = Math.max(far, near + 1.0);
   } else {
     near = camera.frustum.near;
     far = shadowMap.maximumDistance;