Orange: made Compositing more interactive. It now has an event based

system tracking changes in nodes, making sure only these nodes and
the ones that depend, are executed.

Further the 'time cursor' now counts down to indicate which node is being
done.

Also: you now can disable the "use nodes" button in the header, edit all
changes, and when you press that button again it nicely executes the
changes.

Still on the todo:
- make compositing threaded
- find a way to nicely exit compositing on input events... so the UI
  keeps being responsive
- idea; a 'percentage' menu in header to enforce calculations on smaller
  images temporally

13 files changed, 358 insertions, 125 deletions

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 622236a6264..f289de038d6 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -41,6 +41,7 @@ struct bNodeStack;
 struct uiBlock;
 struct rctf;
 struct ListBase;
+struct RenderData;
 
 #define SOCK_IN		1
 #define SOCK_OUT	2
@@ -101,6 +102,7 @@ void			ntreeSolveOrder(struct bNodeTree *ntree);
 
 void			ntreeBeginExecTree(struct bNodeTree *ntree);
 void			ntreeExecTree(struct bNodeTree *ntree, void *callerdata, int thread);
+void			ntreeCompositExecTree(struct bNodeTree *ntree, struct RenderData *rd, int do_previews);
 void			ntreeEndExecTree(struct bNodeTree *ntree);
 
 void			ntreeInitPreview(struct bNodeTree *, int xsize, int ysize);
@@ -126,6 +128,8 @@ struct bNode	*nodeGetActive(struct bNodeTree *ntree);
 struct bNode	*nodeGetActiveID(struct bNodeTree *ntree, short idtype);
 void			nodeClearActiveID(struct bNodeTree *ntree, short idtype);
 
+void			NodeTagChanged(struct bNodeTree *ntree, struct bNode *node);
+
 /* ************** Groups ****************** */
 
 struct bNode	*nodeMakeGroupFromSelected(struct bNodeTree *ntree);
@@ -218,9 +222,9 @@ extern bNodeType *node_all_composit[];
 
 /* API */
 struct CompBuf;
-struct RenderData;
-void ntreeCompositExecTree(struct bNodeTree *ntree, struct RenderData *rd, int do_previews);
 int ntreeCompositNeedsRender(struct bNodeTree *ntree);
+void ntreeCompositTagRender(struct bNodeTree *ntree);
+
 void free_compbuf(struct CompBuf *cbuf); /* internal...*/
 
 #endif
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index a1f0c4095e2..3e99f83a8f6 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -38,6 +38,7 @@
 #include "BKE_blender.h"
 #include "BKE_colortools.h"
 #include "BKE_global.h"
+#include "BKE_image.h"
 #include "BKE_library.h"
 #include "BKE_main.h"
 #include "BKE_node.h"
@@ -282,7 +283,7 @@ static void group_verify_own_indices(bNodeTree *ngroup)
 			if(sock->own_index==0 && sock->intern==0)
 				sock->own_index= ++(ngroup->cur_index);
 	}
-	printf("internal index %d\n", ngroup->cur_index);
+//	printf("internal index %d\n", ngroup->cur_index);
 }
 
 
@@ -776,8 +777,10 @@ bNode *nodeCopyNode(struct bNodeTree *ntree, struct bNode *node)
 		sock->own_index= 0;
 	
 	duplicatelist(&nnode->outputs, &node->outputs);
-	for(sock= nnode->outputs.first; sock; sock= sock->next)
+	for(sock= nnode->outputs.first; sock; sock= sock->next) {
 		sock->own_index= 0;
+		sock->ns.data= NULL;
+	}
 	
 	if(nnode->id)
 		nnode->id->us++;
@@ -850,8 +853,10 @@ static void node_unlink_node(bNodeTree *ntree, bNode *node)
 	for(link= ntree->links.first; link; link= next) {
 		next= link->next;
 		
-		if(link->fromnode==node)
+		if(link->fromnode==node) {
 			lb= &node->outputs;
+			NodeTagChanged(ntree, link->tonode);
+		}
 		else if(link->tonode==node)
 			lb= &node->inputs;
 		else
@@ -869,6 +874,16 @@ static void node_unlink_node(bNodeTree *ntree, bNode *node)
 	}
 }
 
+static void composit_free_sockets(bNode *node)
+{
+	bNodeSocket *sock;
+	
+	for(sock= node->outputs.first; sock; sock= sock->next) {
+		if(sock->ns.data)
+			free_compbuf(sock->ns.data);
+	}
+}
+
 void nodeFreeNode(bNodeTree *ntree, bNode *node)
 {
 	node_unlink_node(ntree, node);
@@ -877,6 +892,8 @@ void nodeFreeNode(bNodeTree *ntree, bNode *node)
 	if(node->id)
 		node->id->us--;
 	
+	if(ntree->type==NTREE_COMPOSIT)
+		composit_free_sockets(node);
 	BLI_freelistN(&node->inputs);
 	BLI_freelistN(&node->outputs);
 	
@@ -1207,6 +1224,22 @@ void ntreeSolveOrder(bNodeTree *ntree)
 		might be different for editor or for "real" use... */
 }
 
+/* should be callback! */
+void NodeTagChanged(bNodeTree *ntree, bNode *node)
+{
+	if(ntree->type==NTREE_COMPOSIT) {
+		bNodeSocket *sock;
+		
+		for(sock= node->outputs.first; sock; sock= sock->next) {
+			if(sock->ns.data) {
+				free_compbuf(sock->ns.data);
+				sock->ns.data= NULL;
+			}
+		}
+		node->need_exec= 1;
+	}
+}
+
 #pragma mark /* *************** preview *********** */
 
 /* if node->preview, then we assume the rect to exist */
@@ -1362,6 +1395,54 @@ static int ntree_begin_exec_tree(bNodeTree *ntree)
 	return index;
 }
 
+/* copy socket compbufs to stack */
+static void composit_begin_exec(bNodeTree *ntree)
+{
+	bNode *node;
+	
+	for(node= ntree->nodes.first; node; node= node->next) {
+		bNodeSocket *sock;
+		for(sock= node->outputs.first; sock; sock= sock->next) {
+			if(sock->ns.data) {
+				bNodeStack *ns= ntree->stack + sock->stack_index;
+
+				ns->data= sock->ns.data;
+				sock->ns.data= NULL;
+			}
+		}
+	}
+}
+
+/* copy stack compbufs to sockets */
+static void composit_end_exec(bNodeTree *ntree)
+{
+	extern void print_compbuf(char *str, struct CompBuf *cbuf);
+	bNode *node;
+	bNodeStack *ns;
+	int a;
+	
+	for(node= ntree->nodes.first; node; node= node->next) {
+		bNodeSocket *sock;
+		
+		for(sock= node->outputs.first; sock; sock= sock->next) {
+			ns= ntree->stack + sock->stack_index;
+			if(ns->data) {
+				sock->ns.data= ns->data;
+				ns->data= NULL;
+			}
+		}
+		node->need_exec= 0;
+	}
+				
+	for(ns= ntree->stack, a=0; a<ntree->stacksize; a++, ns++) {
+		if(ns->data) {
+			print_compbuf("error: buf hanging in stack", ns->data);
+			free_compbuf(ns->data);
+		}
+	}
+				
+}
+
 /* stack indices make sure all nodes only write in allocated data, for making it thread safe */
 /* only root tree gets the stack, to enable instances to have own stack entries */
 /* only two threads now! */
@@ -1385,7 +1466,8 @@ void ntreeBeginExecTree(bNodeTree *ntree)
 		/* tag inputs, the get_stack() gives own socket stackdata if not in use */
 		for(a=0; a<ntree->stacksize; a++, ns++) ns->hasinput= 1;
 		
-		/* tag outputs, so we know when we can skip operations */
+		/* tag used outputs, so we know when we can skip operations */
+		/* hrms... groups... */
 		for(node= ntree->nodes.first; node; node= node->next) {
 			bNodeSocket *sock;
 			for(sock= node->inputs.first; sock; sock= sock->next) {
@@ -1395,8 +1477,10 @@ void ntreeBeginExecTree(bNodeTree *ntree)
 				}
 			}
 		}
-		
-		ntree->stack1= MEM_dupallocN(ntree->stack);
+		if(ntree->type==NTREE_COMPOSIT)
+			composit_begin_exec(ntree);
+		else
+			ntree->stack1= MEM_dupallocN(ntree->stack);
 	}
 	
 	ntree->init |= NTREE_EXEC_INIT;
@@ -1407,25 +1491,17 @@ void ntreeEndExecTree(bNodeTree *ntree)
 	
 	if(ntree->init & NTREE_EXEC_INIT) {
 		
-		if(ntree->stack) {
-			
-			/* another callback candidate! */
-			if(ntree->type==NTREE_COMPOSIT) {
-				bNodeStack *ns;
-				int a;
-				
-				for(ns= ntree->stack, a=0; a<ntree->stacksize; a++, ns++)
-					if(ns->data)
-						free_compbuf(ns->data);
-				for(ns= ntree->stack1, a=0; a<ntree->stacksize; a++, ns++)
-					if(ns->data)
-						free_compbuf(ns->data);
-			}
+		/* another callback candidate! */
+		if(ntree->type==NTREE_COMPOSIT)
+			composit_end_exec(ntree);
+		
+		if(ntree->stack)
 			MEM_freeN(ntree->stack);
-			ntree->stack= NULL;
+		ntree->stack= NULL;
+		
+		if(ntree->stack1)
 			MEM_freeN(ntree->stack1);
-			ntree->stack1= NULL;
-		}
+		ntree->stack1= NULL;
 
 		ntree->init &= ~NTREE_EXEC_INIT;
 	}
@@ -1477,3 +1553,78 @@ void ntreeExecTree(bNodeTree *ntree, void *callerdata, int thread)
 	}
 }
 
+/* optimized tree execute test for compositing */
+void ntreeCompositExecTree(bNodeTree *ntree, RenderData *rd, int do_preview)
+{
+	bNode *node;
+	bNodeSocket *sock;
+	bNodeStack *nsin[MAX_SOCKET];	/* arbitrary... watch this */
+	bNodeStack *nsout[MAX_SOCKET];	/* arbitrary... watch this */
+	bNodeStack *stack;
+	int totnode;
+	
+	if(ntree==NULL) return;
+	
+	totnode= BLI_countlist(&ntree->nodes);
+	
+	if(do_preview)
+		ntreeInitPreview(ntree, 0, 0);
+	
+	ntreeBeginExecTree(ntree);
+	
+	stack= ntree->stack;
+	
+	for(node= ntree->nodes.first; node; node= node->next) {
+		if(node->typeinfo->execfunc) {
+			int a;
+			
+			node_get_stack(node, stack, nsin, nsout);
+			
+			/* test the inputs */
+			for(a=0, sock= node->inputs.first; sock; sock= sock->next, a++) {
+				/* is sock in use? */
+				if(sock->link) {
+					if(nsin[a]->data==NULL || sock->link->fromnode->need_exec) {
+						node->need_exec= 1;
+						break;
+					}
+				}
+			}
+			
+			/* test the outputs */
+			for(a=0, sock= node->outputs.first; sock; sock= sock->next, a++) {
+				if(nsout[a]->data==NULL && nsout[a]->hasoutput) {
+					node->need_exec= 1;
+					break;
+				}
+			}
+			if(node->need_exec) {
+				
+				/* free output buffers */
+				for(a=0, sock= node->outputs.first; sock; sock= sock->next, a++) {
+					if(nsout[a]->data) {
+						free_compbuf(nsout[a]->data);
+						nsout[a]->data= NULL;
+					}
+				}
+				if(ntree->timecursor)
+					ntree->timecursor(totnode);
+				
+				printf("exec node %s\n", node->name);
+				node->typeinfo->execfunc(rd, node, nsin, nsout);
+			}
+		}
+		else if(node->type==NODE_GROUP && node->id) {
+			node_get_stack(node, stack, nsin, nsout);
+			node_group_execute(stack, rd, node, nsin, nsout); 
+		}
+		totnode--;
+	}
+	
+	
+	ntreeEndExecTree(ntree);
+	
+	free_unused_animimages();
+	
+}
+
diff --git a/source/blender/blenkernel/intern/node_composit.c b/source/blender/blenkernel/intern/node_composit.c
index 93e5bb8a902..bcb3e9e600d 100644
--- a/source/blender/blenkernel/intern/node_composit.c
+++ b/source/blender/blenkernel/intern/node_composit.c
@@ -81,9 +81,9 @@ static CompBuf *alloc_compbuf(int sizex, int sizey, int type, int alloc)
 	cbuf->type= type;
 	if(alloc) {
 		if(cbuf->type==CB_RGBA)
-			cbuf->rect= MEM_mallocN(4*sizeof(float)*sizex*sizey, "new rect");
+			cbuf->rect= MEM_mallocN(4*sizeof(float)*sizex*sizey, "compbuf RGBA rect");
 		else
-			cbuf->rect= MEM_mallocN(sizeof(float)*sizex*sizey, "new rect");
+			cbuf->rect= MEM_mallocN(sizeof(float)*sizex*sizey, "compbuf Fac rect");
 		cbuf->malloc= 1;
 	}
 	cbuf->disprect.xmin= 0;
@@ -101,6 +101,14 @@ void free_compbuf(CompBuf *cbuf)
 	MEM_freeN(cbuf);
 }
 
+void print_compbuf(char *str, CompBuf *cbuf)
+{
+	printf("Compbuf %s %d %d %p\n", str, cbuf->x, cbuf->y, cbuf->rect);
+	
+}
+
+
+
 #if 0
 /* on first call, disprect should be initialized to 'out', then you can call this on all 'src' images */
 static void get_overlap_rct(CompBuf *out, CompBuf *src, rcti *disprect)
@@ -449,7 +457,7 @@ static void node_composit_exec_viewer(void *data, bNode *node, bNodeStack **in,
 			
 			cbuf= alloc_compbuf(rectx, recty, CB_RGBA, 0);	// no alloc
 			cbuf->rect= ima->ibuf->rect_float;
-			
+
 			/* when no alpha, we can simply copy */
 			if(in[1]->data==NULL)
 				composit1_pixel_processor(node, cbuf, in[0]->data, in[0]->vec, do_copy_rgba);
@@ -733,6 +741,7 @@ static bNodeSocketType cmp_node_rresult_out[]= {
 static void node_composit_exec_rresult(void *data, bNode *node, bNodeStack **in, bNodeStack **out)
 {
 	RenderResult *rr= RE_GetResult(RE_GetRender("Render"));
+	
 	if(rr) {
 		RenderLayer *rl= BLI_findlink(&rr->layers, node->custom1);
 		if(rl) {
@@ -1815,7 +1824,7 @@ bNodeType *node_all_composit[]= {
 	NULL
 };
 
-/* ******************* execute and parse ************ */
+/* ******************* parse ************ */
 
 /* helper call to detect if theres a render-result node */
 int ntreeCompositNeedsRender(bNodeTree *ntree)
@@ -1831,23 +1840,15 @@ int ntreeCompositNeedsRender(bNodeTree *ntree)
 	return 0;
 }
 
-/* note; if called without preview, and previews exist, they get updated */
-/* render calls it without previews, works nicer for bg render */
-void ntreeCompositExecTree(bNodeTree *ntree, RenderData *rd, int do_preview)
+void ntreeCompositTagRender(bNodeTree *ntree)
 {
-	if(ntree==NULL) return;
-	
-	if(do_preview)
-		ntreeInitPreview(ntree, 0, 0);
-	
-	ntreeBeginExecTree(ntree);
-
-	/* allocate composit data? */
-	
-	ntreeExecTree(ntree, rd, 0);	/* threads */
+	bNode *node;
 	
-	ntreeEndExecTree(ntree);
+	if(ntree==NULL) return;
 	
-	free_unused_animimages();
+	for(node= ntree->nodes.first; node; node= node->next) {
+		if(node->type==CMP_NODE_R_RESULT)
+			NodeTagChanged(ntree, node);
+	}
 }
 
diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 1a42c299335..492c1b1c264 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -494,7 +494,8 @@ void scene_add_render_layer(Scene *sce)
 	srl= MEM_callocN(sizeof(SceneRenderLayer), "new render layer");
 	sprintf(srl->name, "%d RenderLayer", tot);
 	BLI_addtail(&sce->r.layers, srl);
-	
+
+	/* note, this is also in render, pipeline.c, to make layer when scenedata doesnt have it */
 	srl->lay= (1<<20) -1;
 	srl->layflag= 0x7FFF;	/* solid ztra halo strand */
 	srl->passflag= SCE_PASS_COMBINED|SCE_PASS_Z;
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index 5433d2b7ce1..1d523cbec29 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -1260,6 +1260,7 @@ static void direct_link_nodetree(FileData *fd, bNodeTree *ntree)
 	
 	ntree->init= 0;		/* to set callbacks */
 	ntree->owntype= NULL;
+	ntree->timecursor= NULL;
 	
 	link_list(fd, &ntree->nodes);
 	for(node= ntree->nodes.first; node; node= node->next) {
@@ -1285,6 +1286,8 @@ static void direct_link_nodetree(FileData *fd, bNodeTree *ntree)
 		node->lasty= 0;
 		for(sock= node->inputs.first; sock; sock= sock->next)
 			sock->link= newdataadr(fd, sock->link);
+		for(sock= node->outputs.first; sock; sock= sock->next)
+			sock->ns.data= NULL;
 	}
 	for(link= ntree->links.first; link; link= link->next) {
 		link->fromnode= newdataadr(fd, link->fromnode);
diff --git a/source/blender/include/butspace.h b/source/blender/include/butspace.h
index bc6529f1d3d..930327f3489 100644
--- a/source/blender/include/butspace.h
+++ b/source/blender/include/butspace.h
@@ -194,9 +194,6 @@ void curvemap_buttons(struct uiBlock *block, struct CurveMapping *cumap, char la
 
 #define B_MAT_LAYERBROWSE	1220
 #define B_MAT_USENODES		1221
-		/* also handled in editnode.c */
-#define B_NODE_EXEC			1222
-#define B_NODE_LOADIMAGE	1223
 
 /* *********************** */
 #define B_TEXBUTS		1400
@@ -655,8 +652,21 @@ enum {
 #define B_MODIFIER_REDRAW	3502
 
 /* *********************** */
-/*  BUTTON BUT: > 4000	   */
-/*  BUTTON 4001-4032: layers */
+#define B_NODE_BUTS			4000
+		/* 400 slots reserved, we want an exec event for each node */
+#define B_NODE_LOADIMAGE	3601
+#define B_NODE_TREE_EXEC	3602
+
+		/* exec should be last in this list */
+#define B_NODE_EXEC			3610
+
+
+/* *********************** */
+/*  BUTTON 4001-4032: layers? (sort this out!) */
+
+/* *********************** */
+/* event code 0x4000 (16384) and larger: general events (redraws, etc) */
+
 
 #endif
 
diff --git a/source/blender/makesdna/DNA_node_types.h b/source/blender/makesdna/DNA_node_types.h
index 700de9531da..853857f6915 100644
--- a/source/blender/makesdna/DNA_node_types.h
+++ b/source/blender/makesdna/DNA_node_types.h
@@ -51,7 +51,7 @@ typedef struct bNodeStack {
 	short hasinput;			/* when input has link, tagged before executing */
 	short hasoutput;		/* when output is linked, tagged before executing */
 	short datatype;			/* type of data pointer */
-	short pad1;
+	short pad;
 } bNodeStack;
 
 /* ns->datatype, shadetree only */
@@ -109,7 +109,7 @@ typedef struct bNode {
 	short done, level;		/* both for dependency and sorting */
 	short lasty, menunr;	/* lasty: check preview render status, menunr: browse ID blocks */
 	short stack_index;		/* for groupnode, offset in global caller stack */
-	short pad;
+	short nr;				/* number of this node in list, used for exec events */
 	
 	ListBase inputs, outputs;
 	struct ID *id;			/* optional link to libdata */
@@ -119,7 +119,8 @@ typedef struct bNode {
 	float locx, locy;		/* root offset for drawing */
 	float width, miniwidth;			
 	short custom1, custom2;	/* to be abused for buttons */
-	int pad1;
+	
+	short need_exec, pad1;	/* need_exec is set to optimize execution */
 	
 	rctf totr;				/* entire boundbox */
 	rctf butr;				/* optional buttons area */
@@ -164,6 +165,9 @@ typedef struct bNodeTree {
 	struct bNodeType **alltypes;	/* type definitions, set on fileread, no read/write */
 	struct bNodeType *owntype;		/* for groups or dynamic trees, no read/write */
 	
+	/* callbacks */
+	void (*timecursor)(int nr);
+	
 } bNodeTree;
 
 /* ntree->type, index */
diff --git a/source/blender/render/intern/source/pipeline.c b/source/blender/render/intern/source/pipeline.c
index 342a69a9007..d1099891264 100644
--- a/source/blender/render/intern/source/pipeline.c
+++ b/source/blender/render/intern/source/pipeline.c
@@ -832,7 +832,7 @@ static void do_render_final(Render *re, Scene *scene)
 		/* first check if theres nodetree with render result */
 		int do_render= ntreeCompositNeedsRender(scene->nodetree);
 		/* but.. do we use nodes? */
-		if(scene->use_nodes==NULL) do_render= 1;
+		if(scene->use_nodes==0) do_render= 1;
 		
 		re->scene= scene;
 		
@@ -847,6 +847,9 @@ static void do_render_final(Render *re, Scene *scene)
 			else
 				render_one_frame(re);
 		}
+		
+		ntreeCompositTagRender(scene->nodetree);
+		
 		if(re->r.scemode & R_DOCOMP)
 			ntreeCompositExecTree(scene->nodetree, &re->r, 0);
 	}
diff --git a/source/blender/src/butspace.c b/source/blender/src/butspace.c
index 93d97372ec5..e3f6a1d5515 100644
--- a/source/blender/src/butspace.c
+++ b/source/blender/src/butspace.c
@@ -42,6 +42,7 @@
 #include "MEM_guardedalloc.h"
 
 #include "DNA_color_types.h"
+#include "DNA_material_types.h"
 #include "DNA_object_types.h"
 #include "DNA_scene_types.h"
 #include "DNA_screen_types.h"
@@ -52,12 +53,14 @@
 #include "BKE_colortools.h"
 #include "BKE_global.h"
 #include "BKE_main.h"
+#include "BKE_material.h"
 #include "BKE_library.h"
 #include "BKE_utildefines.h"
 
 #include "BLI_blenlib.h"
 
 #include "BSE_drawview.h"	// for do_viewbuttons.c .... hurms
+#include "BSE_node.h"
 
 #include "BIF_gl.h"
 #include "BIF_graphics.h"
@@ -470,6 +473,26 @@ void curvemap_buttons(uiBlock *block, CurveMapping *cumap, char labeltype, short
 
 /* --------------------------------- */
 
+/* nodes have button callbacks, that can draw in butspace too. need separate handling */
+static void do_node_buts(unsigned short event)
+{
+	Material *ma;
+
+	/* all operations default on active material layer here */
+	/* but this also gets called for lamp and world... */
+	ma= G.buts->lockpoin;
+	if(ma && GS(ma->id.name)==ID_MA)
+		ma = editnode_get_active_material(ma);
+	else
+		ma= NULL;
+	
+	if(event>=B_NODE_EXEC) {
+		if(ma) end_render_material(ma);	/// temporal... 3d preview
+		BIF_preview_changed(ID_MA);
+		allqueue(REDRAWNODE, 0);
+		allqueue(REDRAWBUTSSHADING, 0);
+	}		
+}
 
 void do_butspace(unsigned short event)
 {
@@ -566,6 +589,9 @@ void do_butspace(unsigned short event)
 		extern void do_modifier_panels(unsigned short event);
 		do_modifier_panels(event);
 	}
+	else if(event<=B_NODE_BUTS) {
+		do_node_buts(event);
+	}
 	else if(event==REDRAWVIEW3D) allqueue(event, 1);	// 1=do header too
 	else if(event>REDRAWVIEW3D) allqueue(event, 0);
 }
diff --git a/source/blender/src/buttons_shading.c b/source/blender/src/buttons_shading.c
index 64474c7f343..a34d9d8406e 100644
--- a/source/blender/src/buttons_shading.c
+++ b/source/blender/src/buttons_shading.c
@@ -2548,13 +2548,6 @@ void do_matbuts(unsigned short event)
 			allqueue(REDRAWBUTSSHADING, 0);
 		}		
 		break;
-	case B_NODE_EXEC:
-		if(ma) end_render_material(ma);	/// temporal... 3d preview
-		BIF_preview_changed(ID_MA);
-		allqueue(REDRAWNODE, 0);
-		allqueue(REDRAWBUTSSHADING, 0);
-		break;
-		
 	}
 }
 
diff --git a/source/blender/src/drawnode.c b/source/blender/src/drawnode.c
index 467bc2fa60f..bdb3c0bf67f 100644
--- a/source/blender/src/drawnode.c
+++ b/source/blender/src/drawnode.c
@@ -208,7 +208,7 @@ static int node_buts_value(uiBlock *block, bNodeTree *ntree, bNode *node, rctf *
 	if(block) {
 		bNodeSocket *sock= node->outputs.first;		/* first socket stores value */
 		
-		uiDefButF(block, NUM, B_NODE_EXEC, "", 
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", 
 				  butr->xmin, butr->ymin, butr->xmax-butr->xmin, 20, 
 				  sock->ns.vec, 0.0f, 1.0f, 10, 2, "");
 		
@@ -224,10 +224,10 @@ static int node_buts_rgb(uiBlock *block, bNodeTree *ntree, bNode *node, rctf *bu
 			/* enforce square box drawing */
 			uiBlockSetEmboss(block, UI_EMBOSSP);
 			
-			uiDefButF(block, HSVCUBE, B_NODE_EXEC, "", 
+			uiDefButF(block, HSVCUBE, B_NODE_EXEC+node->nr, "", 
 					  butr->xmin, butr->ymin, butr->xmax-butr->xmin, 12, 
 					  sock->ns.vec, 0.0f, 1.0f, 3, 0, "");
-			uiDefButF(block, HSVCUBE, B_NODE_EXEC, "", 
+			uiDefButF(block, HSVCUBE, B_NODE_EXEC+node->nr, "", 
 					  butr->xmin, butr->ymin+15, butr->xmax-butr->xmin, butr->ymax-butr->ymin -15 -15, 
 					  sock->ns.vec, 0.0f, 1.0f, 2, 0, "");
 			uiDefButF(block, COL, B_NOP, "",		
@@ -247,7 +247,7 @@ static int node_buts_mix_rgb(uiBlock *block, bNodeTree *ntree, bNode *node, rctf
 		uiBut *bt;
 		
 		/* blend type */
-		bt=uiDefButS(block, MENU, B_NODE_EXEC, "Mix %x0|Add %x1|Subtract %x3|Multiply %x2|Screen %x4|Divide %x5|Difference %x6|Darken %x7|Lighten %x8",
+		bt=uiDefButS(block, MENU, B_NODE_EXEC+node->nr, "Mix %x0|Add %x1|Subtract %x3|Multiply %x2|Screen %x4|Divide %x5|Difference %x6|Darken %x7|Lighten %x8",
 					 butr->xmin, butr->ymin, butr->xmax-butr->xmin, 20, 
 					 &node->custom1, 0, 0, 0, 0, "");
 		uiButSetFunc(bt, node_but_title_cb, node, bt);
@@ -259,7 +259,7 @@ static int node_buts_valtorgb(uiBlock *block, bNodeTree *ntree, bNode *node, rct
 {
 	if(block) {
 		if(node->storage) {
-			draw_colorband_buts_small(block, node->storage, butr, B_NODE_EXEC);
+			draw_colorband_buts_small(block, node->storage, butr, B_NODE_EXEC+node->nr);
 		}
 	}
 	return 40;
@@ -268,7 +268,7 @@ static int node_buts_valtorgb(uiBlock *block, bNodeTree *ntree, bNode *node, rct
 static int node_buts_curvevec(uiBlock *block, bNodeTree *ntree, bNode *node, rctf *butr)
 {
 	if(block) {
-		curvemap_buttons(block, node->storage, 'v', B_NODE_EXEC, B_REDR, butr);
+		curvemap_buttons(block, node->storage, 'v', B_NODE_EXEC+node->nr, B_REDR, butr);
 	}	
 	return (int)(node->width-NODE_DY);
 }
@@ -276,7 +276,7 @@ static int node_buts_curvevec(uiBlock *block, bNodeTree *ntree, bNode *node, rct
 static int node_buts_curvecol(uiBlock *block, bNodeTree *ntree, bNode *node, rctf *butr)
 {
 	if(block) {
-		curvemap_buttons(block, node->storage, 'c', B_NODE_EXEC, B_REDR, butr);
+		curvemap_buttons(block, node->storage, 'c', B_NODE_EXEC+node->nr, B_REDR, butr);
 	}	
 	return (int)(node->width-NODE_DY);
 }
@@ -286,7 +286,7 @@ static int node_buts_normal(uiBlock *block, bNodeTree *ntree, bNode *node, rctf
 	if(block) {
 		bNodeSocket *sock= node->outputs.first;		/* first socket stores normal */
 		
-		uiDefButF(block, BUT_NORMAL, B_NODE_EXEC, "", 
+		uiDefButF(block, BUT_NORMAL, B_NODE_EXEC+node->nr, "", 
 				  butr->xmin, butr->ymin, butr->xmax-butr->xmin, butr->ymax-butr->ymin, 
 				  sock->ns.vec, 0.0f, 1.0f, 0, 0, "");
 		
@@ -426,13 +426,13 @@ static int node_shader_buts_material(uiBlock *block, bNodeTree *ntree, bNode *no
 			if(butr->ymax-butr->ymin > 21.0f) {
 				/* node options */
 				uiBlockSetCol(block, TH_AUTO);
-				uiDefButBitS(block, TOG, SH_NODE_MAT_DIFF, B_NODE_EXEC, "Diff",
+				uiDefButBitS(block, TOG, SH_NODE_MAT_DIFF, B_NODE_EXEC+node->nr, "Diff",
 							 butr->xmin, butr->ymin, dx, 19, 
 							 &node->custom1, 0, 0, 0, 0, "Material Node outputs Diffuse");
-				uiDefButBitS(block, TOG, SH_NODE_MAT_SPEC, B_NODE_EXEC, "Spec",
+				uiDefButBitS(block, TOG, SH_NODE_MAT_SPEC, B_NODE_EXEC+node->nr, "Spec",
 							 butr->xmin+dx, butr->ymin, dx, 19, 
 							 &node->custom1, 0, 0, 0, 0, "Material Node outputs Specular");
-				uiDefButBitS(block, TOG, SH_NODE_MAT_NEG, B_NODE_EXEC, "Neg Normal",
+				uiDefButBitS(block, TOG, SH_NODE_MAT_NEG, B_NODE_EXEC+node->nr, "Neg Normal",
 							 butr->xmax-dx, butr->ymin, dx, 19,
 							 &node->custom1, 0, 0, 0, 0, "Material Node uses inverted Normal");
 			}
@@ -447,7 +447,7 @@ static int node_shader_buts_texture(uiBlock *block, bNodeTree *ntree, bNode *nod
 	if(block) {
 		uiBut *bt;
 		
-		bt= uiDefIDPoinBut(block, test_texpoin_but, ID_TE, B_NODE_EXEC, "",
+		bt= uiDefIDPoinBut(block, test_texpoin_but, ID_TE, B_NODE_EXEC+node->nr, "",
 						   butr->xmin, butr->ymin, butr->xmax-butr->xmin, 19, 
 						   &node->id,  ""); 
 		uiButSetFunc(bt, node_ID_title_cb, node, NULL);
@@ -467,26 +467,26 @@ static int node_shader_buts_mapping(uiBlock *block, bNodeTree *ntree, bNode *nod
 		uiBlockSetFunc(block, node_texmap_cb, texmap, NULL);	/* all buttons get this */
 		
 		uiBlockBeginAlign(block);
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+dx, dy, 2*dx, 19, texmap->loc, -1000.0f, 1000.0f, 10, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->loc+1, -1000.0f, 1000.0f, 10, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->loc+2, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+dx, dy, 2*dx, 19, texmap->loc, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->loc+1, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->loc+2, -1000.0f, 1000.0f, 10, 2, "");
 		dy-= 19;
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+dx, dy, 2*dx, 19, texmap->rot, -1000.0f, 1000.0f, 1000, 1, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->rot+1, -1000.0f, 1000.0f, 1000, 1, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->rot+2, -1000.0f, 1000.0f, 1000, 1, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+dx, dy, 2*dx, 19, texmap->rot, -1000.0f, 1000.0f, 1000, 1, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->rot+1, -1000.0f, 1000.0f, 1000, 1, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->rot+2, -1000.0f, 1000.0f, 1000, 1, "");
 		dy-= 19;
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+dx, dy, 2*dx, 19, texmap->size, -1000.0f, 1000.0f, 10, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->size+1, -1000.0f, 1000.0f, 10, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->size+2, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+dx, dy, 2*dx, 19, texmap->size, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->size+1, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->size+2, -1000.0f, 1000.0f, 10, 2, "");
 		dy-= 25;
 		uiBlockBeginAlign(block);
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+dx, dy, 2*dx, 19, texmap->min, -10.0f, 10.0f, 100, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->min+1, -10.0f, 10.0f, 100, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->min+2, -10.0f, 10.0f, 100, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+dx, dy, 2*dx, 19, texmap->min, -10.0f, 10.0f, 100, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->min+1, -10.0f, 10.0f, 100, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->min+2, -10.0f, 10.0f, 100, 2, "");
 		dy-= 19;
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+dx, dy, 2*dx, 19, texmap->max, -10.0f, 10.0f, 10, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->max+1, -10.0f, 10.0f, 10, 2, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->max+2, -10.0f, 10.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+dx, dy, 2*dx, 19, texmap->max, -10.0f, 10.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+3*dx, dy, 2*dx, 19, texmap->max+1, -10.0f, 10.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", butr->xmin+5*dx, dy, 2*dx, 19, texmap->max+2, -10.0f, 10.0f, 10, 2, "");
 		uiBlockEndAlign(block);
 		
 		/* labels/options */
@@ -498,9 +498,9 @@ static int node_shader_buts_mapping(uiBlock *block, bNodeTree *ntree, bNode *nod
 		dy-= 19;
 		uiDefBut(block, LABEL, B_NOP, "Size", butr->xmin, dy, dx, 19, NULL, 0.0f, 0.0f, 0, 0, "");
 		dy-= 25;
-		uiDefButBitI(block, TOG, TEXMAP_CLIP_MIN, B_NODE_EXEC, "Min", butr->xmin, dy, dx-4, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
+		uiDefButBitI(block, TOG, TEXMAP_CLIP_MIN, B_NODE_EXEC+node->nr, "Min", butr->xmin, dy, dx-4, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
 		dy-= 19;
-		uiDefButBitI(block, TOG, TEXMAP_CLIP_MAX, B_NODE_EXEC, "Max", butr->xmin, dy, dx-4, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
+		uiDefButBitI(block, TOG, TEXMAP_CLIP_MAX, B_NODE_EXEC+node->nr, "Max", butr->xmin, dy, dx-4, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
 		
 	}	
 	return 5*19 + 6;
@@ -640,17 +640,17 @@ static int node_composit_buts_image(uiBlock *block, bNodeTree *ntree, bNode *nod
 			short width= (short)(butr->xmax-butr->xmin)/2;
 			
 			dy-= 19;
-			uiDefButS(block, NUM, B_NODE_EXEC, "Frs:",
+			uiDefButS(block, NUM, B_NODE_EXEC+node->nr, "Frs:",
 					  butr->xmin, dy, width, 19, 
 					  &nia->frames, 0.0, 10000.0, 0, 0, "Amount of images used in animation");
-			uiDefButS(block, NUM, B_NODE_EXEC, "SFra:",
+			uiDefButS(block, NUM, B_NODE_EXEC+node->nr, "SFra:",
 					  butr->xmin+width, dy, width, 19, 
 					  &nia->sfra, 1.0, 1000.0, 0, 0, "Start frame of animation");
 			dy-= 19;
-			uiDefButS(block, NUM, B_NODE_EXEC, "First:",
+			uiDefButS(block, NUM, B_NODE_EXEC+node->nr, "First:",
 					  butr->xmin, dy, width, 19, 
 					  &nia->nr, 0.0, 10000.0, 0, 0, "Number in image name, used as first in animation");
-			uiDefButC(block, TOG, B_NODE_EXEC, "Cycl",
+			uiDefButC(block, TOG, B_NODE_EXEC+node->nr, "Cycl",
 					  butr->xmin+width, dy, width, 19, 
 					  &nia->cyclic, 0.0, 0.0, 0, 0, "Make animation go cyclic");
 			
@@ -687,7 +687,7 @@ static int node_composit_buts_renderresult(uiBlock *block, bNodeTree *ntree, bNo
 		char *strp;
 		
 		strp= scene_layer_menu();
-		bt= uiDefButS(block, MENU, B_NODE_EXEC, strp, 
+		bt= uiDefButS(block, MENU, B_NODE_EXEC+node->nr, strp, 
 				  butr->xmin, butr->ymin, (butr->xmax-butr->xmin), 19, 
 				  &node->custom1, 0, 0, 0, 0, "Choose Render Layer");
 		uiButSetFunc(bt, node_but_title_cb, node, bt);
@@ -702,10 +702,10 @@ static int node_composit_buts_blur(uiBlock *block, bNodeTree *ntree, bNode *node
 		uiBut *bt;
 		
 		uiBlockBeginAlign(block);
-		bt=uiDefButS(block, NUM, B_NODE_EXEC, "X:",
+		bt=uiDefButS(block, NUM, B_NODE_EXEC+node->nr, "X:",
 					 butr->xmin, butr->ymin, (butr->xmax-butr->xmin)/2, 19, 
 					 &node->custom1, 0, 256, 0, 0, "");
-		bt=uiDefButS(block, NUM, B_NODE_EXEC, "Y:",
+		bt=uiDefButS(block, NUM, B_NODE_EXEC+node->nr, "Y:",
 					 butr->xmin+(butr->xmax-butr->xmin)/2, butr->ymin, (butr->xmax-butr->xmin)/2, 19, 
 					 &node->custom2, 0, 256, 0, 0, "");
 	}
@@ -718,7 +718,7 @@ static int node_composit_buts_filter(uiBlock *block, bNodeTree *ntree, bNode *no
 		uiBut *bt;
 		
 		/* blend type */
-		bt=uiDefButS(block, MENU, B_NODE_EXEC, "Soften %x0|Sharpen %x1|Laplace %x2|Sobel %x3|Prewitt %x4|Kirsch %x5|Shadow %x6",
+		bt=uiDefButS(block, MENU, B_NODE_EXEC+node->nr, "Soften %x0|Sharpen %x1|Laplace %x2|Sobel %x3|Prewitt %x4|Kirsch %x5|Shadow %x6",
 					 butr->xmin, butr->ymin, butr->xmax-butr->xmin, 20, 
 					 &node->custom1, 0, 0, 0, 0, "");
 		uiButSetFunc(bt, node_but_title_cb, node, bt);
@@ -735,16 +735,16 @@ static int node_composit_buts_map_value(uiBlock *block, bNodeTree *ntree, bNode
 		short dx= (short)(butr->xmax-butr->xmin)/2;
 		
 		uiBlockBeginAlign(block);
-		uiDefButF(block, NUM, B_NODE_EXEC, "Offs:", xstart, dy, 2*dx, 19, texmap->loc, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "Offs:", xstart, dy, 2*dx, 19, texmap->loc, -1000.0f, 1000.0f, 10, 2, "");
 		dy-= 19;
-		uiDefButF(block, NUM, B_NODE_EXEC, "Size:", xstart, dy, 2*dx, 19, texmap->size, -1000.0f, 1000.0f, 10, 3, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "Size:", xstart, dy, 2*dx, 19, texmap->size, -1000.0f, 1000.0f, 10, 3, "");
 		dy-= 23;
 		uiBlockBeginAlign(block);
-		uiDefButBitI(block, TOG, TEXMAP_CLIP_MIN, B_NODE_EXEC, "Min", xstart, dy, dx, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", xstart+dx, dy, dx, 19, texmap->min, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButBitI(block, TOG, TEXMAP_CLIP_MIN, B_NODE_EXEC+node->nr, "Min", xstart, dy, dx, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", xstart+dx, dy, dx, 19, texmap->min, -1000.0f, 1000.0f, 10, 2, "");
 		dy-= 19;
-		uiDefButBitI(block, TOG, TEXMAP_CLIP_MIN, B_NODE_EXEC, "Max", xstart, dy, dx, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
-		uiDefButF(block, NUM, B_NODE_EXEC, "", xstart+dx, dy, dx, 19, texmap->min, -1000.0f, 1000.0f, 10, 2, "");
+		uiDefButBitI(block, TOG, TEXMAP_CLIP_MIN, B_NODE_EXEC+node->nr, "Max", xstart, dy, dx, 19, &texmap->flag, 0.0f, 0.0f, 0, 0, "");
+		uiDefButF(block, NUM, B_NODE_EXEC+node->nr, "", xstart+dx, dy, dx, 19, texmap->min, -1000.0f, 1000.0f, 10, 2, "");
 	}
 	return 80;
 }
@@ -1315,7 +1315,7 @@ static void node_draw_basis(ScrArea *sa, SpaceNode *snode, bNode *node)
 					butpoin= sock->tosock->ns.vec;
 				
 				if(sock->type==SOCK_VALUE) {
-					bt= uiDefButF(node->block, NUM, B_NODE_EXEC, sock->name, 
+					bt= uiDefButF(node->block, NUM, B_NODE_EXEC+node->nr, sock->name, 
 						  (short)sock->locx+NODE_DYS, (short)(sock->locy)-9, (short)node->width-NODE_DY, 17, 
 						  butpoin, 0.0f, 1.0f, 10, 2, "");
 					uiButSetFunc(bt, node_sync_cb, snode, node);
@@ -1330,7 +1330,7 @@ static void node_draw_basis(ScrArea *sa, SpaceNode *snode, bNode *node)
 					
 					if(labelw>0) width= 40; else width= node->width-NODE_DY;
 					
-					bt= uiDefButF(node->block, COL, B_NODE_EXEC, "", 
+					bt= uiDefButF(node->block, COL, B_NODE_EXEC+node->nr, "", 
 						(short)(sock->locx+NODE_DYS), (short)sock->locy-8, width, 15, 
 						   butpoin, 0, 0, 0, 0, "");
 					uiButSetFunc(bt, node_sync_cb, snode, node);
@@ -1539,6 +1539,7 @@ static void node_draw_nodetree(ScrArea *sa, SpaceNode *snode, bNodeTree *ntree)
 {
 	bNode *node;
 	bNodeLink *link;
+	int a;
 	
 	if(ntree==NULL) return;		/* groups... */
 	
@@ -1551,8 +1552,9 @@ static void node_draw_nodetree(ScrArea *sa, SpaceNode *snode, bNodeTree *ntree)
 	glDisable( GL_LINE_SMOOTH );
 	
 	/* not selected first */
-	for(node= ntree->nodes.first; node; node= node->next) {
+	for(a=0, node= ntree->nodes.first; node; node= node->next, a++) {
 		node->block= NULL;	/* were freed */
+		node->nr= a;		/* index of node in list, used for exec event code */
 		if(!(node->flag & SELECT)) {
 			if(node->flag & NODE_GROUP_EDIT);
 			else if(node->flag & NODE_HIDDEN)
diff --git a/source/blender/src/editnode.c b/source/blender/src/editnode.c
index 8a90d31be57..84354859067 100644
--- a/source/blender/src/editnode.c
+++ b/source/blender/src/editnode.c
@@ -140,12 +140,20 @@ static void snode_handle_recalc(SpaceNode *snode)
 		BIF_preview_changed(ID_MA);	 /* signals buttons windows and node editors */
 	}
 	else if(snode->treetype==NTREE_COMPOSIT) {
-		ntreeCompositExecTree(snode->nodetree, &G.scene->r, 1);	/* 1 is do_previews */
-		allqueue(REDRAWNODE, 1);
-		allqueue(REDRAWIMAGE, 1);
-		if(G.scene->r.scemode & R_DOCOMP) {
-			BIF_redraw_render_rect();	/* seems to screwup display? */
-			mywinset(curarea->win);
+		if(G.scene->use_nodes) {
+			snode->nodetree->timecursor= set_timecursor;
+			
+			ntreeCompositExecTree(snode->nodetree, &G.scene->r, 1);	/* 1 is do_previews */
+			
+			waitcursor(0);
+			allqueue(REDRAWNODE, 1);
+			allqueue(REDRAWIMAGE, 1);
+			if(G.scene->r.scemode & R_DOCOMP) {
+				BIF_redraw_render_rect();	/* seems to screwup display? */
+				mywinset(curarea->win);
+			}
+			
+			snode->nodetree->timecursor= NULL;
 		}
 	}
 }
@@ -153,19 +161,21 @@ static void snode_handle_recalc(SpaceNode *snode)
 static void shader_node_event(SpaceNode *snode, short event)
 {
 	switch(event) {
-		case B_NODE_EXEC:
-			snode_handle_recalc(snode);
-			break;
 		case B_REDR:
 			allqueue(REDRAWNODE, 1);
 			break;
+		default:
+			/* B_NODE_EXEC */
+			snode_handle_recalc(snode);
+			break;
+			
 	}
 }
 
 static void load_node_image(char *str)	/* called from fileselect */
 {
 	SpaceNode *snode= curarea->spacedata.first;
-	bNode *node= nodeGetActive(snode->nodetree);
+	bNode *node= nodeGetActive(snode->edittree);
 	Image *ima= NULL;
 	
 	ima= add_image(str);
@@ -188,15 +198,12 @@ static void composit_node_event(SpaceNode *snode, short event)
 {
 	
 	switch(event) {
-		case B_NODE_EXEC:
-			snode_handle_recalc(snode);
-			break;
 		case B_REDR:
 			allqueue(REDRAWNODE, 1);
 			break;
 		case B_NODE_LOADIMAGE:
 		{
-			bNode *node= nodeGetActive(snode->nodetree);
+			bNode *node= nodeGetActive(snode->edittree);
 			char name[FILE_MAXDIR+FILE_MAXFILE];
 			
 			if(node->id)
@@ -205,6 +212,16 @@ static void composit_node_event(SpaceNode *snode, short event)
 			
 			activate_fileselect(FILE_SPECIAL, "SELECT IMAGE", name, load_node_image);
 		}
+		case B_NODE_TREE_EXEC:
+			snode_handle_recalc(snode);
+			break;		
+		default:
+			/* B_NODE_EXEC */
+		{
+			bNode *node= BLI_findlink(&snode->edittree->nodes, event-B_NODE_EXEC);
+			if(node) NodeTagChanged(snode->edittree, node);
+			snode_handle_recalc(snode);
+		}			
 	}
 }
 
@@ -345,7 +362,10 @@ static void node_set_active(SpaceNode *snode, bNode *node)
 						tnode->flag &= ~NODE_DO_OUTPUT;
 				
 				node->flag |= NODE_DO_OUTPUT;
-				if(was_output==0) snode_handle_recalc(snode);
+				if(was_output==0) {
+					NodeTagChanged(snode->edittree, node);
+					snode_handle_recalc(snode);
+				}
 				
 				/* add node doesnt link this yet... */
 				if(node->id==NULL) {
@@ -1283,11 +1303,17 @@ static int node_add_link_drag(SpaceNode *snode, bNode *node, bNodeSocket *sock,
 		else BIF_wait_for_statechange();		
 	}
 	
+	/* remove link? */
 	if(link->tonode==NULL || link->fromnode==NULL) {
 		nodeRemLink(snode->edittree, link);
 	}
 	else {
 		bNodeLink *tlink;
+
+		/* send changed events for original tonode and new */
+		if(link->tonode) 
+			NodeTagChanged(snode->edittree, link->tonode);
+		
 		/* we might need to remove a link */
 		if(in_out==SOCK_OUT) {
 			if(nodeCountSocketLinks(snode->edittree, link->tosock) > tsock->limit) {
@@ -1365,6 +1391,10 @@ static int node_add_link(SpaceNode *snode)
 					break;
 			}
 			if(link) {
+				/* send changed event to original tonode */
+				if(link->tonode) 
+					NodeTagChanged(snode->edittree, link->tonode);
+				
 				node= link->fromnode;
 				sock= link->fromsock;
 				nodeRemLink(snode->edittree, link);
@@ -1472,11 +1502,12 @@ static void node_border_link_delete(SpaceNode *snode)
 				for(a=0; a<hits; a++) {
 					bNodeLink *link= BLI_findlink(&snode->edittree->links, buffer[ (4 * a) + 3]);
 					if(link)
-						link->tonode= NULL;	/* first tag for delete, otherwise indices are wrong */
+						link->fromnode= NULL;	/* first tag for delete, otherwise indices are wrong */
 				}
 				for(link= snode->edittree->links.first; link; link= next) {
 					next= link->next;
-					if(link->tonode==NULL) {
+					if(link->fromnode==NULL) {
+						NodeTagChanged(snode->edittree, link->tonode);
 						nodeRemLink(snode->edittree, link);
 					}
 				}
diff --git a/source/blender/src/header_node.c b/source/blender/src/header_node.c
index 18df9c084ae..b1ee0043be6 100644
--- a/source/blender/src/header_node.c
+++ b/source/blender/src/header_node.c
@@ -82,7 +82,11 @@ void do_node_buttons(ScrArea *sa, unsigned short event)
 			break;
 			
 		case B_NODE_USESCENE:
-			node_composit_default(G.scene);
+			if(G.scene->use_nodes) {
+				if(G.scene->nodetree==NULL)
+					node_composit_default(G.scene);
+				addqueue(curarea->win, UI_BUT_EVENT, B_NODE_TREE_EXEC);
+			}
 			snode_set_context(snode);
 			allqueue(REDRAWNODE, 0);
 			break;