From 8c75853bb6cecc70e201e38c7354c36539419324 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Thu, 5 Aug 2010 10:50:38 +0000
Subject: bugfix [#23164] Copied Scene Nodes! copying a scene would still have
 nodes point back to the old scene which would crash (in some cases) or break
 rendering.

---
 source/blender/blenkernel/BKE_node.h     |  1 +
 source/blender/blenkernel/intern/node.c  | 13 +++++++++++++
 source/blender/blenkernel/intern/scene.c |  9 ++++++---
 3 files changed, 20 insertions(+), 3 deletions(-)

(limited to 'source/blender/blenkernel')

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 292cd95e572..4bd4cc3792f 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -136,6 +136,7 @@ void			ntreeMakeOwnType(struct bNodeTree *ntree);
 void			ntreeUpdateType(struct bNodeTree *ntree, struct bNodeType *ntype);
 void			ntreeFreeTree(struct bNodeTree *ntree);
 struct bNodeTree *ntreeCopyTree(struct bNodeTree *ntree, int internal_select);
+void			ntreeSwitchID(struct bNodeTree *ntree, struct ID *sce_from, struct ID *sce_to);
 void			ntreeMakeLocal(struct bNodeTree *ntree);
 
 void			ntreeSocketUseFlags(struct bNodeTree *ntree);
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 2a4713ee25c..36c23216585 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -1064,6 +1064,7 @@ bNodeTree *ntreeAddTree(int type)
  *	- internal_select is only 1 when used for duplicating selected nodes (i.e. Shift-D duplicate operator)
  *	- this gets called when executing compositing updates (for threaded previews)
  *	- when the nodetree datablock needs to be copied (i.e. when users get copied)
+ *	- for scene duplication use ntreeSwapID() after so we dont have stale pointers.
  */
 bNodeTree *ntreeCopyTree(bNodeTree *ntree, int internal_select)
 {
@@ -1142,6 +1143,18 @@ bNodeTree *ntreeCopyTree(bNodeTree *ntree, int internal_select)
 	return newtree;
 }
 
+/* use when duplicating scenes */
+void ntreeSwitchID(bNodeTree *ntree, ID *id_from, ID *id_to)
+{
+	bNode *node;
+	/* for scene duplication only */
+	for(node= ntree->nodes.first; node; node= node->next) {
+		if(node->id==id_from) {
+			node->id= id_to;
+		}
+	}
+}
+
 /* *************** preview *********** */
 /* if node->preview, then we assume the rect to exist */
 
diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 0f44c02d16d..95705ea8c05 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -172,9 +172,12 @@ Scene *copy_scene(Main *bmain, Scene *sce, int type)
 		BLI_duplicatelist(&(scen->transform_spaces), &(sce->transform_spaces));
 		BLI_duplicatelist(&(scen->r.layers), &(sce->r.layers));
 		BKE_keyingsets_copy(&(scen->keyingsets), &(sce->keyingsets));
-		
-		scen->nodetree= ntreeCopyTree(sce->nodetree, 0);
-		
+
+		if(sce->nodetree) {
+			scen->nodetree= ntreeCopyTree(sce->nodetree, 0);
+			ntreeSwitchID(scen->nodetree, &sce->id, &scen->id);
+		}
+
 		obase= sce->base.first;
 		base= scen->base.first;
 		while(base) {
-- 
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