From 635c2591ffbb602ebf03ebc5ac2ad2ffd9674db1 Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brecht@blender.org>
Date: Fri, 28 Jul 2023 17:33:39 +0200
Subject: [PATCH] Fix #109683: Cycles AOV render without surface output missing
 attributes

---
 intern/cycles/scene/shader.cpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/intern/cycles/scene/shader.cpp b/intern/cycles/scene/shader.cpp
index 789dfbd9d66..9c44ff5acc5 100644
--- a/intern/cycles/scene/shader.cpp
+++ b/intern/cycles/scene/shader.cpp
@@ -339,6 +339,18 @@ void Shader::tag_update(Scene *scene)
   has_volume = has_volume || output->input("Volume")->link;
   has_displacement = has_displacement || output->input("Displacement")->link;
 
+  if (!has_surface) {
+    foreach (ShaderNode *node, graph->nodes) {
+      if (node->special_type == SHADER_SPECIAL_TYPE_OUTPUT_AOV) {
+        foreach (const ShaderInput *in, node->inputs) {
+          if (in->link) {
+            has_surface = true;
+          }
+        }
+      }
+    }
+  }
+
   /* get requested attributes. this could be optimized by pruning unused
    * nodes here already, but that's the job of the shader manager currently,
    * and may not be so great for interactive rendering where you temporarily
@@ -347,8 +359,9 @@ void Shader::tag_update(Scene *scene)
   AttributeRequestSet prev_attributes = attributes;
 
   attributes.clear();
-  foreach (ShaderNode *node, graph->nodes)
+  foreach (ShaderNode *node, graph->nodes) {
     node->attributes(this, &attributes);
+  }
 
   if (has_displacement) {
     if (displacement_method == DISPLACE_BOTH) {