From 83eb5b119bc6dd78215ae387d6efaa5bd8a7402a Mon Sep 17 00:00:00 2001
From: Keli Li <Keli.Li@autodesk.com>
Date: Thu, 18 Jan 2024 10:35:55 -0500
Subject: [PATCH] make sure skydome light is not turned off unexpectedly

---
 .../hydraExtensions/sceneIndex/mayaHydraSceneIndex.cpp     | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/mayaHydra/hydraExtensions/sceneIndex/mayaHydraSceneIndex.cpp b/lib/mayaHydra/hydraExtensions/sceneIndex/mayaHydraSceneIndex.cpp
index 7e453adfba..548717b0d4 100644
--- a/lib/mayaHydra/hydraExtensions/sceneIndex/mayaHydraSceneIndex.cpp
+++ b/lib/mayaHydra/hydraExtensions/sceneIndex/mayaHydraSceneIndex.cpp
@@ -886,7 +886,7 @@ void MayaHydraSceneIndex::PreFrame(const MHWRender::MDrawContext& context)
         }
     }
 
-    // Turn on active lights, turn off non-active lights, and add non-created active lights.
+    // Turn on active lights, turn off non-active lights
     _MapAdapter<MayaHydraLightAdapter>(
         [&](MayaHydraLightAdapter* a) {
             auto lgtAdapter = activeLightPaths.find(a->GetDagPath().fullPathName().asChar());
@@ -894,7 +894,10 @@ void MayaHydraSceneIndex::PreFrame(const MHWRender::MDrawContext& context)
                 a->SetLightingOn(true);
                 activeLightPaths.erase(lgtAdapter);
             } else {
-                a->SetLightingOn(false);
+                // Skip dome light as maya numberOfActiveLights API doesn't count active dome light
+                if (a->LightType() != HdPrimTypeTokens->domeLight) {
+                    a->SetLightingOn(false);
+                }
             }
         },
         _lightAdapters);