From 1dfe8047d3a6c1b39b4e2e7d5b8ea6fb9515816c Mon Sep 17 00:00:00 2001
From: Weizhen Huang <weizhen@blender.org>
Date: Thu, 5 Jun 2025 20:53:48 +0200
Subject: [PATCH] Fix #105546: Cycles volume uninitialized when frame is beyond
 valid range

Pull Request: https://projects.blender.org/blender/blender/pulls/139930
---
 intern/cycles/blender/volume.cpp | 7 +++++++
 intern/cycles/scene/volume.cpp   | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/intern/cycles/blender/volume.cpp b/intern/cycles/blender/volume.cpp
index ae815afbffb..4c50ddef792 100644
--- a/intern/cycles/blender/volume.cpp
+++ b/intern/cycles/blender/volume.cpp
@@ -200,6 +200,8 @@ static void sync_smoke_volume(
                                           ATTR_STD_VOLUME_VELOCITY,
                                           ATTR_STD_NONE};
 
+  const Interval<int> frame_interval = {b_domain.cache_frame_start(), b_domain.cache_frame_end()};
+
   for (int i = 0; attributes[i] != ATTR_STD_NONE; i++) {
     const AttributeStandard std = attributes[i];
     if (!volume->need_attribute(scene, std)) {
@@ -210,6 +212,11 @@ static void sync_smoke_volume(
 
     Attribute *attr = volume->attributes.add(std);
 
+    if (!frame_interval.contains(frame)) {
+      attr->data_voxel().clear();
+      continue;
+    }
+
     unique_ptr<ImageLoader> loader = make_unique<BlenderSmokeLoader>(b_ob_info.real_object, std);
     ImageParams params;
     params.frame = frame;
diff --git a/intern/cycles/scene/volume.cpp b/intern/cycles/scene/volume.cpp
index 1c735c15265..f5742f7f0f4 100644
--- a/intern/cycles/scene/volume.cpp
+++ b/intern/cycles/scene/volume.cpp
@@ -677,6 +677,10 @@ void GeometryManager::create_volume_mesh(const Scene *scene, Volume *volume, Pro
 
     ImageHandle &handle = attr.data_voxel();
 
+    if (handle.empty()) {
+      continue;
+    }
+
     /* Try building from OpenVDB grid directly. */
     VDBImageLoader *vdb_loader = handle.vdb_loader();
     openvdb::GridBase::ConstPtr grid;