From 85c84c1eceec697391332e6e3b9df85e03086e57 Mon Sep 17 00:00:00 2001
From: Yuval Tassa <tassa@google.com>
Date: Tue, 20 May 2025 12:18:14 -0700
Subject: [PATCH] Initialize Passive Viewer's internal `mjModel` and `mjData`
 to `nullptr`.

Prevents the render thread from calling `mjv_updateScene` before these have been initialized.

PiperOrigin-RevId: 761181568
Change-Id: I4f7f61fdcf7f87dcd6317883e5082d9ce2266e20
---
 simulate/simulate.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/simulate/simulate.h b/simulate/simulate.h
index 7e20d3c5..312b5db7 100644
--- a/simulate/simulate.h
+++ b/simulate/simulate.h
@@ -132,8 +132,8 @@ class Simulate {
 
   // in passive mode the user owns m_ and d_, these "passive" instances are
   // owned by Simulate, updated from the user by the Sync() method
-  mjModel* m_passive_;
-  mjData* d_passive_;
+  mjModel* m_passive_ = nullptr;
+  mjData* d_passive_ = nullptr;
   std::vector<mjvGeom> user_scn_geoms_;
 
   mjOption mjopt_prev_;