From 37183d68b82441f6ab74cba06d9efb2accca34cc Mon Sep 17 00:00:00 2001
From: hpinkos <hannah@cesium.com>
Date: Tue, 18 Dec 2018 11:48:16 -0500
Subject: [PATCH] z index warning for polylines not clamped to ground

---
 Source/DataSources/PolylineGeometryUpdater.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Source/DataSources/PolylineGeometryUpdater.js b/Source/DataSources/PolylineGeometryUpdater.js
index 87e1258e9005..530d49f94c6a 100644
--- a/Source/DataSources/PolylineGeometryUpdater.js
+++ b/Source/DataSources/PolylineGeometryUpdater.js
@@ -14,6 +14,7 @@ define([
         '../Core/GeometryInstance',
         '../Core/GroundPolylineGeometry',
         '../Core/Iso8601',
+        '../Core/oneTimeWarning',
         '../Core/PolylineGeometry',
         '../Core/PolylinePipeline',
         '../Core/ShowGeometryInstanceAttribute',
@@ -44,6 +45,7 @@ define([
         GeometryInstance,
         GroundPolylineGeometry,
         Iso8601,
+        oneTimeWarning,
         PolylineGeometry,
         PolylinePipeline,
         ShowGeometryInstanceAttribute,
@@ -521,6 +523,10 @@ define([
 
             this._clampToGround = defined(clampToGround) ? clampToGround.getValue(Iso8601.MINIMUM_VALUE) : false;
 
+            if (!this._clampToGround && defined(zIndex)) {
+                oneTimeWarning('Entity polylines must have clampToGround: true when using zIndex.  zIndex will be ignored.');
+            }
+
             this._dynamic = false;
             this._geometryChanged.raiseEvent(this);
         }