diff --git a/source/Makefile b/source/Makefile
index 8b35120d99f..0f46e6abfaf 100644
--- a/source/Makefile
+++ b/source/Makefile
@@ -235,6 +235,7 @@ PULIB += $(OCGDIR)/blender/ed_image/libed_image.a
 PULIB += $(OCGDIR)/blender/ed_ipo/libed_ipo.a
 PULIB += $(OCGDIR)/blender/ed_outliner/libed_outliner.a
 PULIB += $(OCGDIR)/blender/ed_time/libed_time.a
+PULIB += $(OCGDIR)/blender/ed_preview/libed_preview.a
 PULIB += $(OCGDIR)/blender/ed_view3d/libed_view3d.a
 PULIB += $(OCGDIR)/blender/ed_interface/libed_interface.a
 PULIB += $(OCGDIR)/blender/ed_object/libed_object.a
diff --git a/source/blender/editors/SConscript b/source/blender/editors/SConscript
index d6b7619ba9f..2af4dc60087 100644
--- a/source/blender/editors/SConscript
+++ b/source/blender/editors/SConscript
@@ -13,7 +13,7 @@ SConscript(['datafiles/SConscript',
 			'curve/SConscript',
 			'gpencil/SConscript',
 			#'physics/SConscript', enable this when there is actually code in physics/
-			#'preview/SConscript', enable this when there is actually code in preview/
+			'preview/SConscript'
 			'space_buttons/SConscript',
 			'space_file/SConscript',
 			'space_image/SConscript',
diff --git a/source/blender/editors/include/ED_view3d.h b/source/blender/editors/include/ED_view3d.h
index a8501e83b42..4ec63e9282c 100644
--- a/source/blender/editors/include/ED_view3d.h
+++ b/source/blender/editors/include/ED_view3d.h
@@ -79,6 +79,8 @@ void project_float_noclip(struct ARegion *ar, float *vec, float *adr);
 void viewline(struct ARegion *ar, struct View3D *v3d, short mval[2], float ray_start[3], float ray_end[3]);
 void viewray(struct ARegion *ar, struct View3D *v3d, short mval[2], float ray_start[3], float ray_normal[3]);
 
+int get_view3d_viewplane(struct View3D *v3d, struct RegionView3D *rv3d, int winxi, int winyi, rctf *viewplane, float *clipsta, float *clipend, float *pixsize);
+
 /* drawobject.c itterators */
 void mesh_foreachScreenVert(struct ViewContext *vc, void (*func)(void *userData, struct EditVert *eve, int x, int y, int index), void *userData, int clipVerts);
 void mesh_foreachScreenEdge(struct ViewContext *vc, void (*func)(void *userData, struct EditEdge *eed, int x0, int y0, int x1, int y1, int index), void *userData, int clipVerts);
diff --git a/source/blender/editors/object/editgroup.c b/source/blender/editors/object/editgroup.c
index b86ebef82cd..bdd119ccf3b 100644
--- a/source/blender/editors/object/editgroup.c
+++ b/source/blender/editors/object/editgroup.c
@@ -97,7 +97,7 @@ static int objects_add_active_exec(bContext *C, wmOperator *op)
 	DAG_scene_sort(CTX_data_scene(C));
 	ED_undo_push(C,"Add To Active Group");
 
-	WM_event_add_notifier(C, NC_SCENE, CTX_data_scene(C));
+	WM_event_add_notifier(C, NC_GROUP|NA_EDITED, NULL);
 	
 	return OPERATOR_FINISHED;
 
@@ -149,7 +149,7 @@ static int objects_remove_active_exec(bContext *C, wmOperator *op)
 	DAG_scene_sort(CTX_data_scene(C));
 	ED_undo_push(C,"Remove From Active Group");
 
-	WM_event_add_notifier(C, NC_SCENE, CTX_data_scene(C));
+	WM_event_add_notifier(C, NC_GROUP|NA_EDITED, NULL);
 	
 	return OPERATOR_FINISHED;
 
@@ -185,7 +185,7 @@ static int group_remove_exec(bContext *C, wmOperator *op)
 	DAG_scene_sort(CTX_data_scene(C));
 	ED_undo_push(C,"Remove From Group");
 
-	WM_event_add_notifier(C, NC_SCENE, CTX_data_scene(C));
+	WM_event_add_notifier(C, NC_GROUP|NA_EDITED, NULL);
 	
 	return OPERATOR_FINISHED;
 
@@ -223,7 +223,7 @@ static int group_create_exec(bContext *C, wmOperator *op)
 	DAG_scene_sort(CTX_data_scene(C));
 	ED_undo_push(C,"Create Group");
 
-	WM_event_add_notifier(C, NC_SCENE, CTX_data_scene(C));
+	WM_event_add_notifier(C, NC_GROUP|NA_EDITED, NULL);
 	
 	return OPERATOR_FINISHED;
 
diff --git a/source/blender/editors/preview/previewrender.c b/source/blender/editors/preview/previewrender.c
new file mode 100644
index 00000000000..c36035a3da8
--- /dev/null
+++ b/source/blender/editors/preview/previewrender.c
@@ -0,0 +1,962 @@
+/* 
+ * $Id$
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/* global includes */
+
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+
+#ifndef WIN32
+#include <unistd.h>
+#else
+#include <io.h>
+#endif   
+#include "MEM_guardedalloc.h"
+
+#include "BLO_readfile.h" 
+
+#include "BLI_arithb.h"
+#include "BLI_blenlib.h"
+
+#include "DNA_texture_types.h"
+#include "DNA_world_types.h"
+#include "DNA_camera_types.h"
+#include "DNA_image_types.h"
+#include "DNA_material_types.h"
+#include "DNA_node_types.h"
+#include "DNA_object_types.h"
+#include "DNA_lamp_types.h"
+#include "DNA_space_types.h"
+#include "DNA_view3d_types.h"
+#include "DNA_scene_types.h"
+#include "DNA_screen_types.h"
+
+#include "BKE_context.h"
+#include "BKE_depsgraph.h"
+#include "BKE_global.h"
+#include "BKE_image.h"
+#include "BKE_icons.h"
+#include "BKE_library.h"
+#include "BKE_main.h"
+#include "BKE_texture.h"
+#include "BKE_material.h"
+#include "BKE_node.h"
+#include "BKE_world.h"
+#include "BKE_texture.h"
+#include "BKE_utildefines.h"
+
+#include "IMB_imbuf.h"
+#include "IMB_imbuf_types.h"
+
+#include "BIF_gl.h"
+#include "BIF_glutil.h"
+
+#include "PIL_time.h"
+
+#include "RE_pipeline.h"
+
+#include "GPU_material.h"
+
+#include "ED_anim_api.h"
+#include "ED_view3d.h"
+
+#include "UI_interface.h"
+
+#include "previewrender_intern.h"
+
+#define PR_XMIN		10
+#define PR_YMIN		5
+#define PR_XMAX		200
+#define PR_YMAX		195
+
+/* XXX */
+static int qtest() {return 0;}
+/* XXX */
+
+static void set_previewrect(ScrArea *sa, RenderInfo *ri)
+{
+	ARegion *ar= NULL; // XXX
+	rctf viewplane;
+	
+	BLI_init_rctf(&viewplane, PR_XMIN, PR_XMAX, PR_YMIN, PR_YMAX);
+
+//	ui_graphics_to_window_rct(ar->win, &viewplane, &ri->disprect);
+	
+	/* correction for gla draw */
+	BLI_translate_rcti(&ri->disprect, -ar->winrct.xmin, -ar->winrct.ymin);
+	
+	glMatrixMode(GL_PROJECTION);
+	glPushMatrix();
+	glMatrixMode(GL_MODELVIEW);
+	glPushMatrix();
+	
+	glaDefine2DArea(&ar->winrct);
+
+	ri->pr_rectx= (ri->disprect.xmax-ri->disprect.xmin);
+	ri->pr_recty= (ri->disprect.ymax-ri->disprect.ymin);
+}
+
+static void end_previewrect(ARegion *ar)
+{
+	glMatrixMode(GL_PROJECTION);
+	glPopMatrix();
+	glMatrixMode(GL_MODELVIEW);
+	glPopMatrix();
+	
+	// restore viewport / scissor which was set by glaDefine2DArea
+	glViewport(ar->winrct.xmin, ar->winrct.ymin, ar->winx, ar->winy);
+	glScissor(ar->winrct.xmin, ar->winrct.ymin, ar->winx, ar->winy);
+
+}
+
+/* unused now */
+void draw_tex_crop(Tex *tex)
+{
+	rcti rct;
+	int ret= 0;
+	
+	if(tex==0) return;
+	
+	if(tex->type==TEX_IMAGE) {
+		if(tex->cropxmin==0.0f) ret++;
+		if(tex->cropymin==0.0f) ret++;
+		if(tex->cropxmax==1.0f) ret++;
+		if(tex->cropymax==1.0f) ret++;
+		if(ret==4) return;
+		
+		rct.xmin= PR_XMIN+2+tex->cropxmin*(PR_XMAX-PR_XMIN-4);
+		rct.xmax= PR_XMIN+2+tex->cropxmax*(PR_XMAX-PR_XMIN-4);
+		rct.ymin= PR_YMIN+2+tex->cropymin*(PR_YMAX-PR_YMIN-4);
+		rct.ymax= PR_YMIN+2+tex->cropymax*(PR_YMAX-PR_YMIN-4);
+
+		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
+
+		glColor3ub(0, 0, 0);
+		glRecti(rct.xmin+1,  rct.ymin-1,  rct.xmax+1,  rct.ymax-1); 
+
+		glColor3ub(255, 255, 255);
+		glRecti(rct.xmin,  rct.ymin,  rct.xmax,  rct.ymax);
+
+		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);			
+	}
+	
+}
+
+/* temporal abuse; if id_code is -1 it only does texture.... solve! */
+void BIF_preview_changed(short id_code)
+{
+#if 0	
+	ScrArea *sa;
+	
+	for(sa= G.curscreen->areabase.first; sa; sa= sa->next) {
+		if(sa->spacetype==SPACE_BUTS) {
+			SpaceButs *sbuts= sa->spacedata.first;
+			if(sbuts->mainb==CONTEXT_SHADING) {
+				int tab= sbuts->tab[CONTEXT_SHADING];
+				if(tab==TAB_SHADING_MAT && (id_code==ID_MA || id_code==ID_TE)) {
+					if (sbuts->ri) sbuts->ri->curtile= 0;
+					addafterqueue(sa->win, RENDERPREVIEW, 1);
+				}
+				else if(tab==TAB_SHADING_TEX && (id_code==ID_TE || id_code==-1)) {
+					if (sbuts->ri) sbuts->ri->curtile= 0;
+					addafterqueue(sa->win, RENDERPREVIEW, 1);
+				}
+				else if(tab==TAB_SHADING_LAMP && (id_code==ID_LA || id_code==ID_TE)) {
+					if (sbuts->ri) sbuts->ri->curtile= 0;
+					addafterqueue(sa->win, RENDERPREVIEW, 1);
+				}
+				else if(tab==TAB_SHADING_WORLD && (id_code==ID_WO || id_code==ID_TE)) {
+					if (sbuts->ri) sbuts->ri->curtile= 0;
+					addafterqueue(sa->win, RENDERPREVIEW, 1);
+				}
+			}
+			else if (sbuts->ri) 
+				sbuts->ri->curtile= 0;	/* ensure changes always result in re-render when context is restored */
+		}
+		else if(sa->spacetype==SPACE_NODE) {
+			SpaceNode *snode= sa->spacedata.first;
+			if(snode->treetype==NTREE_SHADER && (id_code==ID_MA || id_code==ID_TE)) {
+				snode_tag_dirty(snode);
+			}
+		}
+		else if(sa->spacetype==SPACE_VIEW3D) {
+			View3D *vd= sa->spacedata.first;
+			/* if is has a renderinfo, we consider that reason for signalling */
+			if (vd->ri) {
+				vd->ri->curtile= 0;
+				addafterqueue(sa->win, RENDERPREVIEW, 1);
+			}
+		}
+	}
+
+	if(ELEM4(id_code, ID_MA, ID_TE, ID_LA, ID_WO)) {
+		Object *ob;
+		Material *ma;
+
+		if(id_code == ID_WO) {
+			for(ma=G.main->mat.first; ma; ma=ma->id.next) {
+				if(ma->gpumaterial.first) {
+					GPU_material_free(ma);
+				}
+			}
+		}
+		else if(id_code == ID_LA) {
+			for(ob=G.main->object.first; ob; ob=ob->id.next) {
+				if(ob->gpulamp.first) {
+					GPU_lamp_free(ob);
+				}
+			}
+		} else if(OBACT) {
+			Object *ob = OBACT;
+
+			ma= give_current_material(ob, ob->actcol);
+			if(ma && ma->gpumaterial.first) {
+				GPU_material_free(ma);
+			}
+		}
+	}
+#endif
+}
+
+/* *************************** Preview for buttons *********************** */
+
+static Main *pr_main= NULL;
+
+void BIF_preview_init_dbase(void)
+{
+	BlendFileData *bfd;
+	extern int datatoc_preview_blend_size;
+	extern char datatoc_preview_blend[];
+	
+	G.fileflags |= G_FILE_NO_UI;
+	bfd= BLO_read_from_memory(datatoc_preview_blend, datatoc_preview_blend_size, NULL);
+	if (bfd) {
+		pr_main= bfd->main;
+		
+		MEM_freeN(bfd);
+	}
+	G.fileflags &= ~G_FILE_NO_UI;
+}
+
+void BIF_preview_free_dbase(void)
+{
+	if(pr_main)
+		free_main(pr_main);
+}
+
+static Object *find_object(ListBase *lb, const char *name)
+{
+	Object *ob;
+	for(ob= lb->first; ob; ob= ob->id.next)
+		if(strcmp(ob->id.name+2, name)==0)
+			break;
+	return ob;
+}
+
+/* call this with an ID pointer to initialize preview scene */
+/* call this with ID NULL to restore assigned ID pointers in preview scene */
+static Scene *preview_prepare_scene(Scene *scene, RenderInfo *ri, int id_type, ID *id, int pr_method)
+{
+	Scene *sce;
+	Base *base;
+	
+	if(pr_main==NULL) return NULL;
+	
+	sce= pr_main->scene.first;
+	if(sce) {
+		/* this flag tells render to not execute depsgraph or ipos etc */
+		sce->r.scemode |= R_PREVIEWBUTS;
+		/* set world always back, is used now */
+		sce->world= pr_main->world.first;
+		/* now: exposure copy */
+		if(scene->world) {
+			sce->world->exp= scene->world->exp;
+			sce->world->range= scene->world->range;
+		}
+		
+		sce->r.cfra= scene->r.cfra;
+		
+		if(id_type==ID_MA) {
+			Material *mat= (Material *)id;
+			
+			if(id) {
+				init_render_material(mat, 0, NULL);		/* call that retrieves mode_l */
+				end_render_material(mat);
+				
+				/* turn on raytracing if needed */
+				if(mat->mode_l & (MA_RAYTRANSP|MA_RAYMIRROR))
+					sce->r.mode |= R_RAYTRACE;
+				if(mat->sss_flag & MA_DIFF_SSS)
+					sce->r.mode |= R_SSS;
+				
+				/* turn off fake shadows if needed */
+				/* this only works in a specific case where the preview.blend contains
+				 * an object starting with 'c' which has a material linked to it (not the obdata)
+				 * and that material has a fake shadow texture in the active texture slot */
+				for(base= sce->base.first; base; base= base->next) {
+					if(base->object->id.name[2]=='c') {
+						Material *shadmat= give_current_material(base->object, base->object->actcol);
+						if(shadmat) {
+							if (mat->mode & MA_SHADBUF) shadmat->septex = 0;
+							else shadmat->septex |= 1;
+						}
+					}
+				}
+
+				
+				if(pr_method==PR_ICON_RENDER) {
+					if (mat->mode & MA_HALO) {
+						sce->lay= 1<<MA_FLAT;
+					} 
+					else {
+						sce->lay= 1<<MA_SPHERE_A;
+					}
+				}
+				else {
+					sce->lay= 1<<mat->pr_type;
+					if(mat->nodetree)
+						ntreeInitPreview(mat->nodetree, ri->pr_rectx, ri->pr_recty);
+				}
+			}
+			else {
+				sce->r.mode &= ~(R_OSA|R_RAYTRACE|R_SSS);
+			}
+			
+			for(base= sce->base.first; base; base= base->next) {
+				if(base->object->id.name[2]=='p') {
+					if(ELEM4(base->object->type, OB_MESH, OB_CURVE, OB_SURF, OB_MBALL))
+						assign_material(base->object, mat, base->object->actcol);
+				}
+			}
+		}
+		else if(id_type==ID_TE) {
+			Tex *tex= (Tex *)id;
+			
+			sce->lay= 1<<MA_TEXTURE;
+			
+			for(base= sce->base.first; base; base= base->next) {
+				if(base->object->id.name[2]=='t') {
+					Material *mat= give_current_material(base->object, base->object->actcol);
+					if(mat && mat->mtex[0]) {
+						mat->mtex[0]->tex= tex;
+						/* show alpha in this case */
+						if(tex==NULL || (tex->flag & TEX_PRV_ALPHA)) {
+							mat->mtex[0]->mapto |= MAP_ALPHA;
+							mat->alpha= 0.0f;
+						}
+						else {
+							mat->mtex[0]->mapto &= ~MAP_ALPHA;
+							mat->alpha= 1.0f;
+						}
+					}
+				}
+			}
+		}
+		else if(id_type==ID_LA) {
+			Lamp *la= (Lamp *)id;
+			
+			if(la && la->type==LA_SUN && (la->sun_effect_type & LA_SUN_EFFECT_SKY)) {
+				sce->lay= 1<<MA_ATMOS;
+				sce->world= scene->world;
+				sce->camera= (Object *)find_object(&pr_main->object, "CameraAtmo");
+			}
+			else {
+				sce->lay= 1<<MA_LAMP;
+				sce->world= NULL;
+				sce->camera= (Object *)find_object(&pr_main->object, "Camera");
+			}
+			sce->r.mode &= ~R_SHADOW;
+			
+			for(base= sce->base.first; base; base= base->next) {
+				if(base->object->id.name[2]=='p') {
+					if(base->object->type==OB_LAMP)
+						base->object->data= la;
+				}
+			}
+		}
+		else if(id_type==ID_WO) {
+			sce->lay= 1<<MA_SKY;
+			sce->world= (World *)id;
+		}
+		
+		return sce;
+	}
+	
+	return NULL;
+}
+
+static void previewrender_progress(RenderResult *rr, volatile rcti *renrect)
+{
+	SpaceButs *sbuts= NULL; // XXX
+	RenderLayer *rl;
+	RenderInfo *ri= sbuts->ri;
+	float ofsx, ofsy;
+	
+	if(renrect) return;
+	
+	rl= rr->layers.first;
+	
+	ofsx= ri->disprect.xmin + rr->tilerect.xmin;
+	ofsy= ri->disprect.ymin + rr->tilerect.ymin;
+	
+	glDrawBuffer(GL_FRONT);
+	glaDrawPixelsSafe_to32(ofsx, ofsy, rr->rectx, rr->recty, rr->rectx, rl->rectf);
+	bglFlush();
+	glDrawBuffer(GL_BACK);
+}
+
+
+/* called by interface_icons.c, or by BIF_previewrender_buts or by nodes... */
+void BIF_previewrender(Scene *scene, struct ID *id, struct RenderInfo *ri, struct ScrArea *area, int pr_method)
+{
+	Render *re;
+	RenderStats *rstats;
+	Scene *sce;
+	SpaceButs *sbuts= NULL;
+	int oldx= ri->pr_rectx, oldy= ri->pr_recty;
+	char name [32];
+	
+	if(ri->tottile && ri->curtile>=ri->tottile) return;
+	
+	/* check for return with a new event */
+	if(pr_method!=PR_ICON_RENDER && qtest()) {
+//		if(area)
+//			addafterqueue(area->win, RENDERPREVIEW, 1);
+		return;
+	}
+	
+	/* get the stuff from the builtin preview dbase */
+	sce= preview_prepare_scene(scene, ri, GS(id->name), id, pr_method);
+	if(sce==NULL) return;
+	
+	/* set drawing conditions OK */
+	if(area) {
+		sbuts= area->spacedata.first;	/* needed for flag */
+		
+		set_previewrect(area, ri); // uses UImat
+		
+		/* because preview render size can differs */
+		if(ri->rect && (oldx!=ri->pr_rectx || oldy!=ri->pr_recty)) {
+			MEM_freeN(ri->rect);
+			ri->rect= NULL;
+			ri->curtile= 0;
+		}
+	}
+	
+// XXX	sprintf(name, "ButsPreview %d", area?area->win:0);
+	re= RE_GetRender(name);
+	
+	/* full refreshed render from first tile */
+	if(re==NULL || ri->curtile==0) {
+		
+		re= RE_NewRender(name);
+		
+		/* handle cases */
+		if(pr_method==PR_DRAW_RENDER) {
+			RE_display_draw_cb(re, previewrender_progress);
+			RE_test_break_cb(re, qtest);
+			sce->r.scemode |= R_NODE_PREVIEW;
+			if(sbuts->flag & SB_PRV_OSA)
+				sce->r.mode |= R_OSA;
+			sce->r.scemode &= ~R_NO_IMAGE_LOAD;
+		}
+		else if(pr_method==PR_DO_RENDER) {
+			RE_test_break_cb(re, qtest);
+			sce->r.scemode |= R_NODE_PREVIEW;
+			sce->r.scemode &= ~R_NO_IMAGE_LOAD;
+		}
+		else {	/* PR_ICON_RENDER */
+			sce->r.scemode &= ~R_NODE_PREVIEW;
+			sce->r.scemode |= R_NO_IMAGE_LOAD;
+		}
+		
+		/* allocates render result */
+		RE_InitState(re, NULL, &sce->r, ri->pr_rectx, ri->pr_recty, NULL);
+		
+		/* enforce preview image clear */
+		if(GS(id->name)==ID_MA) {
+			Material *ma= (Material *)id;
+			ntreeClearPreview(ma->nodetree);
+		}
+	}
+	/* entire cycle for render engine */
+	RE_SetCamera(re, sce->camera);
+	RE_Database_FromScene(re, sce, 1);
+	RE_TileProcessor(re, ri->curtile, 0);	// actual render engine
+	RE_Database_Free(re);
+	
+	/* handle results */
+	if(pr_method==PR_ICON_RENDER) {
+		if(ri->rect==NULL)
+			ri->rect= MEM_mallocN(sizeof(int)*ri->pr_rectx*ri->pr_recty, "BIF_previewrender");
+		RE_ResultGet32(re, ri->rect);
+	}
+	else {
+		rstats= RE_GetStats(re);
+		
+		if(rstats->partsdone!=ri->curtile) {
+			if(ri->rect==NULL)
+				ri->rect= MEM_mallocN(sizeof(int)*ri->pr_rectx*ri->pr_recty, "BIF_previewrender");
+			RE_ResultGet32(re, ri->rect);
+		}
+		
+		if(rstats->totpart==rstats->partsdone && rstats->partsdone) {
+			// allqueues
+		}
+		else {
+//			if(pr_method==PR_DRAW_RENDER && qtest())
+//				addafterqueue(area->win, RENDERPREVIEW, 1);
+		}
+		
+		ri->curtile= rstats->partsdone;
+		ri->tottile= rstats->totpart;
+	}
+
+	/* unassign the pointers, reset vars */
+	preview_prepare_scene(scene, ri, GS(id->name), NULL, 0);
+	
+}
+
+
+/* afterqueue call */
+void BIF_previewrender_buts(Scene *scene, SpaceButs *sbuts)
+{
+//	ScrArea *sa= NULL; // XXX
+	ARegion *ar= NULL; // XXX
+	uiBlock *block;
+	struct ID* id = 0;
+//	struct ID* idfrom = 0;
+	struct ID* idshow = 0;
+	Object *ob;
+	
+	if (!sbuts->ri) return;
+	
+	
+//	block= uiFindOpenPanelBlockName(&sa->uiblocks, "Preview");
+	if(block==NULL) return;
+	
+	ob= ((scene->basact)? (scene->basact)->object: 0);
+	
+	/* we cant trust this global lockpoin.. for example with headerless window */
+//	buttons_active_id(&id, &idfrom);
+	sbuts->lockpoin= id;
+	
+	if(sbuts->mainb==CONTEXT_SHADING) {
+		int tab= sbuts->tab[CONTEXT_SHADING];
+		
+		if(tab==TAB_SHADING_MAT) 
+			idshow = sbuts->lockpoin;
+		else if(tab==TAB_SHADING_TEX) 
+			idshow = sbuts->lockpoin;
+		else if(tab==TAB_SHADING_LAMP) {
+			if(ob && ob->type==OB_LAMP) idshow= ob->data;
+		}
+		else if(tab==TAB_SHADING_WORLD)
+			idshow = sbuts->lockpoin;
+	}
+	else if(sbuts->mainb==CONTEXT_OBJECT) {
+		if(ob && ob->type==OB_LAMP) idshow = ob->data;
+	}
+	
+	if (idshow) {
+		BKE_icon_changed(BKE_icon_getid(idshow));
+//		uiPanelPush(block);
+//		BIF_previewrender(scene, idshow, sbuts->ri, sbuts->area, PR_DRAW_RENDER);
+//		uiPanelPop(block);
+		end_previewrect(ar);
+	}
+	else {
+		/* no active block to draw. But we do draw black if possible */
+		if(sbuts->ri->rect) {
+			memset(sbuts->ri->rect, 0, sizeof(int)*sbuts->ri->pr_rectx*sbuts->ri->pr_recty);
+			sbuts->ri->tottile= 10000;
+//			addqueue(sa->win, REDRAW, 1);
+		}
+		return;
+	}
+}
+
+
+/* is panel callback, supposed to be called with correct panel offset matrix */
+void BIF_previewdraw(ScrArea *sa, uiBlock *block)
+{
+	ARegion *ar= NULL; // XXX
+	SpaceButs *sbuts= sa->spacedata.first;
+	short id_code= 0;
+	
+	if(sbuts->lockpoin) {
+		ID *id= sbuts->lockpoin;
+		id_code= GS(id->name);
+	}
+	
+	if (!sbuts->ri) {
+		sbuts->ri= MEM_callocN(sizeof(RenderInfo), "butsrenderinfo");
+		sbuts->ri->tottile = 10000;
+	}
+	
+	if (sbuts->ri->rect==NULL) BIF_preview_changed(id_code);
+	else {
+		RenderInfo *ri= sbuts->ri;
+		int oldx= ri->pr_rectx, oldy= ri->pr_recty;
+		
+		/* we now do scalable previews! */
+		set_previewrect(sa, ri);
+		if( ABS(oldx-ri->pr_rectx)<2 && ABS(oldy-ri->pr_recty)<2 ) {
+			/* restore old values for drawing! */
+			ri->pr_rectx= oldx;
+			ri->pr_recty= oldy;
+			glaDrawPixelsSafe(ri->disprect.xmin, ri->disprect.ymin, ri->pr_rectx, ri->pr_recty, ri->pr_rectx, GL_RGBA, GL_UNSIGNED_BYTE, ri->rect);
+		}
+		else {
+			MEM_freeN(ri->rect);
+			ri->rect= NULL;
+			sbuts->ri->curtile= 0;
+		}
+		end_previewrect(ar);
+	}
+	if(sbuts->ri->curtile==0) BIF_preview_changed(id_code);
+	
+}
+
+/* *************************** Preview for 3d window *********************** */
+static void view3d_previewrender_stats(RenderStats *rs)
+{
+//	if(rs->convertdone) 
+//		printf("rendered %d %.3f\n", rs->partsdone, rs->lastframetime);
+}
+
+static void view3d_previewrender_progress(RenderResult *rr, volatile rcti *renrect)
+{
+//	ScrArea *sa= NULL; // XXX
+//	View3D *v3d= NULL; // XXX
+	RenderLayer *rl;
+	int ofsx, ofsy;
+	
+	if(renrect) return;
+	
+	rl= rr->layers.first;
+	
+	/* this case is when we render envmaps... */
+//	if(rr->rectx > v3d->ri->pr_rectx || rr->recty > v3d->ri->pr_recty)
+//		return;
+	
+//	ofsx= v3d->ri->disprect.xmin + rr->tilerect.xmin;
+//	ofsy= v3d->ri->disprect.ymin + rr->tilerect.ymin;
+	
+	glDrawBuffer(GL_FRONT);
+//	glaDefine2DArea(&sa->winrct);
+	glaDrawPixelsSafe_to32(ofsx, ofsy, rr->rectx, rr->recty, rr->rectx, rl->rectf);
+	bglFlush();
+	glDrawBuffer(GL_BACK);
+
+}
+
+void BIF_view3d_previewrender_signal(ScrArea *sa, short signal)
+{
+#if 0
+	View3D *v3d= sa->spacedata.first;
+	
+	/* this can be called from other window... solve! */
+	if(sa->spacetype!=SPACE_VIEW3D)
+		return; // XXX
+	   
+	if(v3d && v3d->ri) {
+		RenderInfo *ri= v3d->ri;
+		ri->status &= ~signal;
+		ri->curtile= 0;
+		//printf("preview signal %d\n", signal);
+		if(ri->re && (signal & PR_DBASE))
+			RE_Database_Free(ri->re);
+
+//		addafterqueue(sa->win, RENDERPREVIEW, 1);
+	}
+#endif
+}
+
+void BIF_view3d_previewrender_free(View3D *v3d)
+{
+#if 0
+	if(v3d->ri) {
+		RenderInfo *ri= v3d->ri;
+		if(ri->re) {
+//			printf("free render\n");
+			RE_Database_Free(ri->re);
+			RE_FreeRender(ri->re);
+			ri->re= NULL;
+		}
+		if (v3d->ri->rect) MEM_freeN(v3d->ri->rect);
+		MEM_freeN(v3d->ri);
+		v3d->ri= NULL;
+	}
+#endif
+}
+
+/* returns 1 if OK, do not call while in panel space!  */
+static int view3d_previewrender_get_rects(ScrArea *sa, rctf *viewplane, RenderInfo *ri, float *clipsta, float *clipend, int *ortho, float *pixsize)
+{
+	View3D *v3d= NULL; // XXX
+	RegionView3D *rv3d= NULL; // XXX
+	int rectx, recty;
+//	uiBlock *block;
+	
+//	block= uiFindOpenPanelBlockName(&sa->uiblocks, "Preview");
+//	if(block==NULL) return 0;
+	
+	/* calculate preview rect size */
+//	BLI_init_rctf(viewplane, 15.0f, (block->maxx - block->minx)-15.0f, 15.0f, (block->maxy - block->miny)-15.0f);
+//	uiPanelPush(block);
+//	ui_graphics_to_window_rct(sa->win, viewplane, &ri->disprect);
+//	uiPanelPop(block);
+	
+	/* correction for gla draw */
+//	BLI_translate_rcti(&ri->disprect, -sa->winrct.xmin, -sa->winrct.ymin);
+	
+	*ortho= get_view3d_viewplane(v3d, rv3d, sa->winx, sa->winy, viewplane, clipsta, clipend, pixsize);
+
+	rectx= ri->disprect.xmax - ri->disprect.xmin;
+	recty= ri->disprect.ymax - ri->disprect.ymin;
+	
+	if(rectx<4 || recty<4) return 0;
+	
+	if(ri->rect && (rectx!=ri->pr_rectx || recty!=ri->pr_recty)) {
+		MEM_freeN(ri->rect);
+		ri->rect= NULL;
+		ri->curtile= 0;
+		printf("changed size\n");
+	}
+	ri->pr_rectx= rectx;
+	ri->pr_recty= recty;
+	
+	return 1;
+}
+
+/* called before a panel gets moved/scaled, makes sure we can see through */
+void BIF_view3d_previewrender_clear(ScrArea *sa)
+{
+#if 0
+	View3D *v3d= sa->spacedata.first;
+
+	if(v3d->ri) {
+		RenderInfo *ri= v3d->ri;
+		ri->curtile= 0;
+		if(ri->rect)
+			MEM_freeN(ri->rect);
+		ri->rect= NULL;
+	}
+#endif
+}
+
+/* afterqueue call */
+void BIF_view3d_previewrender(Scene *scene, ScrArea *sa)
+{
+	bContext *C= NULL;
+	View3D *v3d= sa->spacedata.first;
+	RegionView3D *rv3d= NULL; // XXX
+	Render *re;
+	RenderInfo *ri;	/* preview struct! */
+	RenderStats *rstats;
+	RenderData rdata;
+	rctf viewplane;
+	float clipsta, clipend, pixsize;
+	int orth;
+	
+	/* first get the render info right */
+//	if (!v3d->ri) {
+//		ri= v3d->ri= MEM_callocN(sizeof(RenderInfo), "butsrenderinfo");
+//		ri->tottile= 10000;
+//	}
+//	ri= v3d->ri;
+	
+	if(0==view3d_previewrender_get_rects(sa, &viewplane, ri, &clipsta, &clipend, &orth, &pixsize))
+		return;
+	
+	/* render is finished, so return */
+	if(ri->tottile && ri->curtile>=ri->tottile) return;
+
+	/* or return with a new event */
+	if(qtest()) {
+//		addafterqueue(sa->win, RENDERPREVIEW, 1);
+		return;
+	}
+	//printf("Enter previewrender\n");
+	/* ok, are we rendering all over? */
+	if(ri->re==NULL) {
+		char name[32];
+		
+		ri->status= 0;
+		
+		sprintf(name, "View3dPreview %p", sa);
+		re= ri->re= RE_NewRender(name);
+		RE_display_draw_cb(re, view3d_previewrender_progress);
+		RE_stats_draw_cb(re, view3d_previewrender_stats);
+		RE_test_break_cb(re, qtest);
+		
+		/* no osa, blur, seq, layers, etc for preview render */
+		rdata= scene->r;
+		rdata.mode &= ~(R_OSA|R_MBLUR);
+		rdata.scemode &= ~(R_DOSEQ|R_DOCOMP|R_FREE_IMAGE);
+		rdata.layers.first= rdata.layers.last= NULL;
+		rdata.renderer= R_INTERN;
+		 
+		RE_InitState(re, NULL, &rdata, sa->winx, sa->winy, &ri->disprect);
+	
+		if(orth)
+			RE_SetOrtho(re, &viewplane, clipsta, clipend);
+		else
+			RE_SetWindow(re, &viewplane, clipsta, clipend);
+		RE_SetPixelSize(re, pixsize);
+		
+		/* until here are no escapes */
+		ri->status |= PR_DISPRECT;
+		ri->curtile= 0;
+		//printf("new render\n");
+	}
+
+	re= ri->re;
+	
+	PIL_sleep_ms(100);	/* wait 0.1 second if theres really no event... */
+	if(qtest()==0)	{
+		
+		/* check status */
+		if((ri->status & PR_DISPRECT)==0) {
+			RE_SetDispRect(ri->re, &ri->disprect);
+			if(orth)
+				RE_SetOrtho(ri->re, &viewplane, clipsta, clipend);
+			else
+				RE_SetWindow(ri->re, &viewplane, clipsta, clipend);
+			RE_SetPixelSize(re, pixsize);
+			ri->status |= PR_DISPRECT;
+			ri->curtile= 0;
+			//printf("disprect update\n");
+		}
+		if((ri->status & PR_DBASE)==0) {
+			unsigned int lay= scene->lay;
+			
+			RE_SetView(re, rv3d->viewmat);
+			
+			/* allow localview render for objects with lights in normal layers */
+			if(v3d->lay & 0xFF000000)
+				scene->lay |= v3d->lay;
+			else scene->lay= v3d->lay;
+			
+			RE_Database_FromScene(re, scene, 0);		// 0= dont use camera view
+			scene->lay= lay;
+			
+			rstats= RE_GetStats(re);
+			if(rstats->convertdone) 
+				ri->status |= PR_DBASE|PR_PROJECTED|PR_ROTATED;
+			ri->curtile= 0;
+			
+			/* database can have created render-resol data... */
+			if(rstats->convertdone) 
+				ED_anim_dag_flush_update(C); // <--- only current scene XXX
+			
+			//printf("dbase update\n");
+		}
+		if((ri->status & PR_PROJECTED)==0) {
+			if(ri->status & PR_DBASE) {
+				if(orth)
+					RE_SetOrtho(ri->re, &viewplane, clipsta, clipend);
+				else
+					RE_SetWindow(ri->re, &viewplane, clipsta, clipend);
+				RE_DataBase_ApplyWindow(re);
+				ri->status |= PR_PROJECTED;
+			}
+			ri->curtile= 0;
+			//printf("project update\n");
+		}
+	
+		/* OK, can we enter render code? */
+		if(ri->status==(PR_DISPRECT|PR_DBASE|PR_PROJECTED|PR_ROTATED)) {
+			//printf("curtile %d tottile %d\n", ri->curtile, ri->tottile);
+			RE_TileProcessor(ri->re, ri->curtile, 0);
+	
+			if(ri->rect==NULL)
+				ri->rect= MEM_mallocN(sizeof(int)*ri->pr_rectx*ri->pr_recty, "preview view3d rect");
+			
+			RE_ResultGet32(ri->re, ri->rect);
+		}
+		
+		rstats= RE_GetStats(ri->re);
+//		if(rstats->totpart==rstats->partsdone && rstats->partsdone)
+//			addqueue(sa->win, REDRAW, 1);
+//		else
+//			addafterqueue(sa->win, RENDERPREVIEW, 1);
+		
+		ri->curtile= rstats->partsdone;
+		ri->tottile= rstats->totpart;
+	}
+	else {
+//		addafterqueue(sa->win, RENDERPREVIEW, 1);
+	}
+	
+	//printf("\n");
+}
+
+/* in panel space! */
+static void view3d_previewdraw_rect(ScrArea *sa, uiBlock *block, RenderInfo *ri)
+{
+//	rctf dispf;
+	
+	if(ri->rect==NULL)
+		return;
+	
+//	BLI_init_rctf(&dispf, 15.0f, (block->maxx - block->minx)-15.0f, 15.0f, (block->maxy - block->miny)-15.0f);
+//	ui_graphics_to_window_rct(sa->win, &dispf, &ri->disprect);
+
+	/* correction for gla draw */
+//	BLI_translate_rcti(&ri->disprect, -sa->winrct.xmin, -sa->winrct.ymin);
+	
+	/* when panel scale changed, free rect */
+	if(ri->disprect.xmax-ri->disprect.xmin != ri->pr_rectx ||
+	   ri->disprect.ymax-ri->disprect.ymin != ri->pr_recty) {
+		MEM_freeN(ri->rect);
+		ri->rect= NULL;
+	}
+	else {
+//		glaDefine2DArea(&sa->winrct);
+		glaDrawPixelsSafe(ri->disprect.xmin, ri->disprect.ymin, ri->pr_rectx, ri->pr_recty, ri->pr_rectx, GL_RGBA, GL_UNSIGNED_BYTE, ri->rect);
+	}	
+}
+
+/* is panel callback, supposed to be called with correct panel offset matrix */
+void BIF_view3d_previewdraw(struct ScrArea *sa, struct uiBlock *block)
+{
+	RegionView3D *rv3d= NULL;
+
+//	if (v3d->ri==NULL || v3d->ri->rect==NULL) 
+//		addafterqueue(sa->win, RENDERPREVIEW, 1);
+//	else {
+		view3d_previewdraw_rect(sa, block, rv3d->ri);
+//		if(v3d->ri->curtile==0) 
+//			addafterqueue(sa->win, RENDERPREVIEW, 1);
+//	}
+}
+
diff --git a/source/blender/editors/preview/previewrender_intern.h b/source/blender/editors/preview/previewrender_intern.h
new file mode 100644
index 00000000000..7d42727914b
--- /dev/null
+++ b/source/blender/editors/preview/previewrender_intern.h
@@ -0,0 +1,69 @@
+/**
+ * $Id:
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version. 
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * The Original Code is Copyright (C) 2008 Blender Foundation.
+ * All rights reserved.
+ *
+ * 
+ * Contributor(s): Blender Foundation
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef PREVIEWRENDER_INTERN_H
+#define PREVIEWRENDER_INTERN_H
+
+/* internal exports only */
+
+
+typedef void (*VectorDrawFunc)(int x, int y, int w, int h, float alpha);
+
+/* stores rendered preview  - is also used for icons */
+typedef struct RenderInfo {
+	int pr_rectx;
+	int pr_recty;
+	short curtile, tottile, status;
+	rcti disprect;			/* storage for view3d preview rect */
+	unsigned int* rect;		
+	struct Render *re;		/* persistant render */
+} RenderInfo;
+
+/* ri->status */
+#define PR_DBASE			1
+#define PR_DISPRECT			2
+#define PR_PROJECTED		4
+#define PR_ROTATED			8
+
+/* Render the preview
+
+pr_method:
+- PR_DRAW_RENDER: preview is rendered and drawn, as indicated by called context (buttons panel)
+- PR_ICON_RENDER: the preview is not drawn and the function is not dynamic,
+	so no events are processed. Hopefully fast enough for at least 32x32 
+- PR_DO_RENDER: preview is rendered, not drawn, but events are processed for afterqueue,
+	in use for node editor now.
+	*/
+
+#define PR_DRAW_RENDER	0
+#define PR_ICON_RENDER	1
+#define PR_DO_RENDER	2
+
+
+#endif /* PREVIEWRENDER_INTERN_H */
+
diff --git a/source/blender/editors/space_outliner/space_outliner.c b/source/blender/editors/space_outliner/space_outliner.c
index 6311b698419..69f57d507b9 100644
--- a/source/blender/editors/space_outliner/space_outliner.c
+++ b/source/blender/editors/space_outliner/space_outliner.c
@@ -131,6 +131,10 @@ static void outliner_main_area_listener(ARegion *ar, wmNotifier *wmn)
 					ED_region_tag_redraw(ar);
 					break;
 			}
+		case NC_GROUP:
+			/* all actions now, todo: check outliner view mode? */
+			ED_region_tag_redraw(ar);
+			break;
 	}
 	
 }
diff --git a/source/blender/editors/space_view3d/space_view3d.c b/source/blender/editors/space_view3d/space_view3d.c
index 0bb891e11b4..d0a8e96f332 100644
--- a/source/blender/editors/space_view3d/space_view3d.c
+++ b/source/blender/editors/space_view3d/space_view3d.c
@@ -281,6 +281,10 @@ static void view3d_main_area_listener(ARegion *ar, wmNotifier *wmn)
 					ED_region_tag_redraw(ar);
 					break;
 			}
+		case NC_GROUP:
+			/* all group ops for now */
+			ED_region_tag_redraw(ar);
+			break;
 		case NC_MATERIAL:
 			switch(wmn->data) {
 				case ND_SHADING_DRAW:
diff --git a/source/blender/editors/space_view3d/view3d_intern.h b/source/blender/editors/space_view3d/view3d_intern.h
index fcdd2cd77f8..05f83d51af7 100644
--- a/source/blender/editors/space_view3d/view3d_intern.h
+++ b/source/blender/editors/space_view3d/view3d_intern.h
@@ -134,8 +134,6 @@ void view3d_project_short_noclip(struct ARegion *ar, float *vec, short *adr, flo
 void view3d_project_float(struct ARegion *a, float *vec, float *adr, float mat[4][4]);
 void view3d_get_object_project_mat(RegionView3D *v3d, struct Object *ob, float pmat[4][4], float vmat[4][4]);
 
-int get_view3d_viewplane(View3D *v3d, RegionView3D *rv3d, int winxi, int winyi, rctf *viewplane, float *clipsta, float *clipend, float *pixsize);
-
 void initlocalview(Scene *scene, struct ARegion *ar, View3D *v3d);
 void restore_localviewdata(View3D *vd);
 void endlocalview(Scene *scene, ScrArea *sa);
diff --git a/source/blender/windowmanager/WM_types.h b/source/blender/windowmanager/WM_types.h
index cfb56417d97..7ad61f1a3de 100644
--- a/source/blender/windowmanager/WM_types.h
+++ b/source/blender/windowmanager/WM_types.h
@@ -144,6 +144,7 @@ typedef struct wmNotifier {
 #define	NC_MATERIAL			(5<<24)
 #define	NC_TEXTURE			(6<<24)
 #define	NC_LAMP				(7<<24)
+#define	NC_GROUP			(8<<24)
 
 /* data type, 256 entries is enough, it can overlap */
 #define NOTE_DATA			0x00FF0000