2.5 MetaBalls

 - It is possible to work with MetaBalls in edit mode now
 - Added basic UI to the button window (feel free to change it :-))
 - Header menus should work
 - Undo & redo should work
 - Removed global variable editelems and lastelem (moved it to the MetaBall struct)
 - All tools from old editmball.c was converted to the operators
 - Added lastelem to the RNA
 - Experimental: mb->editelems is only pointer at mb->elems or NULL (depends on Mode). ListBase of MetaElems is not duplicated in edit mode.

Tested with scons at Linux and mac OS X

TODO:
 - Recalc data after Undo or Redo
 - Solve issue with basic MetaBall and Python UI script (only base MetaBall object influence Wiresize and Threshold)
 - Fix orientation of manipulator in "Normal mode" 

5 files changed, 858 insertions, 0 deletions

diff --git a/source/blender/editors/metaball/Makefile b/source/blender/editors/metaball/Makefile
new file mode 100644
index 00000000000..d971ec9b412
--- /dev/null
+++ b/source/blender/editors/metaball/Makefile
@@ -0,0 +1,56 @@
+#
+# $Id$
+#
+# ***** 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) 2007 Blender Foundation
+# All rights reserved.
+#
+# The Original Code is: all of this file.
+#
+# Contributor(s): none yet.
+#
+# ***** END GPL LICENSE BLOCK *****
+#
+# Makes module object directory and bounces make to subdirectories.
+
+LIBNAME = ed_metaball
+DIR = $(OCGDIR)/blender/$(LIBNAME)
+
+include nan_compile.mk
+
+CFLAGS += $(LEVEL_1_C_WARNINGS)
+
+CPPFLAGS += -I$(NAN_GLEW)/include
+CPPFLAGS += -I$(OPENGL_HEADERS)
+
+CPPFLAGS += -I$(NAN_GUARDEDALLOC)/include
+CPPFLAGS += -I$(NAN_ELBEEM)/include
+
+CPPFLAGS += -I../../windowmanager
+CPPFLAGS += -I../../blenkernel
+CPPFLAGS += -I../../blenloader
+CPPFLAGS += -I../../blenlib
+CPPFLAGS += -I../../makesdna
+CPPFLAGS += -I../../makesrna
+CPPFLAGS += -I../../imbuf
+CPPFLAGS += -I../../gpu
+CPPFLAGS += -I../../render/extern/include
+
+# own include 
+
+CPPFLAGS += -I../include 
diff --git a/source/blender/editors/metaball/SConscript b/source/blender/editors/metaball/SConscript
new file mode 100644
index 00000000000..4b1b4090631
--- /dev/null
+++ b/source/blender/editors/metaball/SConscript
@@ -0,0 +1,11 @@
+#!/usr/bin/python
+Import ('env')
+
+sources = env.Glob('*.c')
+
+incs = '../include ../../blenlib ../../blenkernel ../../makesdna ../../imbuf'
+incs += ' ../../windowmanager #/intern/guardedalloc #/extern/glew/include'
+incs += ' #/intern/guardedalloc ../../gpu'
+incs += ' ../../makesrna ../../render/extern/include  #/intern/elbeem/extern'
+
+env.BlenderLib ( 'bf_editors_metaball', sources, Split(incs), [], libtype=['core'], priority=[45] )
diff --git a/source/blender/editors/metaball/editmball.c b/source/blender/editors/metaball/editmball.c
new file mode 100644
index 00000000000..7b9175f8ae0
--- /dev/null
+++ b/source/blender/editors/metaball/editmball.c
@@ -0,0 +1,676 @@
+/**
+ * $Id$
+ *
+ * ***** 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) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ 
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include <math.h>
+#include <string.h>
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "MEM_guardedalloc.h"
+
+#include "BLI_blenlib.h"
+#include "BLI_arithb.h"
+#include "BLI_rand.h"
+
+#include "DNA_meta_types.h"
+#include "DNA_object_types.h"
+#include "DNA_scene_types.h"
+#include "DNA_view3d_types.h"
+#include "DNA_windowmanager_types.h"
+
+#include "RNA_define.h"
+#include "RNA_access.h"
+
+#include "BKE_utildefines.h"
+#include "BKE_depsgraph.h"
+#include "BKE_object.h"
+#include "BKE_context.h"
+
+#include "ED_screen.h"
+#include "ED_view3d.h"
+#include "ED_transform.h"
+#include "ED_util.h"
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+/* This function is used to free all MetaElems from MetaBall */
+void free_editMball(Object *obedit)
+{
+}
+
+/* This function is called, when MetaBall Object is
+ * switched from object mode to edit mode */
+void make_editMball(Object *obedit)
+{
+	MetaBall *mb = (MetaBall*)obedit->data;
+	MetaElem *ml;/*, *newml;*/
+
+	ml= mb->elems.first;
+	
+	while(ml) {
+		if(ml->flag & SELECT) mb->lastelem = ml;
+		ml= ml->next;
+	}
+
+	mb->editelems = &mb->elems;
+}
+
+/* This function is called, when MetaBall Object switched from
+ * edit mode to object mode. List od MetaElements is copied
+ * from object->data->edit_elems to to object->data->elems. */
+void load_editMball(Object *obedit)
+{
+	MetaBall *mb = (MetaBall*)obedit->data;
+	
+	mb->editelems= NULL;
+	mb->lastelem= NULL;
+}
+
+/* Add metaelem primitive to metaball object (which is in edit mode) */
+MetaElem *add_metaball_primitive(bContext *C, int type, int newname)
+{
+	Scene *scene= CTX_data_scene(C);
+	View3D *v3d= CTX_wm_view3d(C);
+	RegionView3D *rv3d = CTX_wm_region_view3d(C);
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mball = (MetaBall*)obedit->data;
+	MetaElem *ml;
+	float *curs, mat[3][3], cent[3], imat[3][3], cmat[3][3];
+
+	/* Deselect all existing metaelems */
+	ml= mball->editelems->first;
+	while(ml) {
+		ml->flag &= ~SELECT;
+		ml= ml->next;
+	}
+
+	Mat3CpyMat4(mat, obedit->obmat);
+
+	if(v3d) {
+		curs= give_cursor(scene, v3d);
+		VECCOPY(cent, curs);
+	}
+	else
+		cent[0]= cent[1]= cent[2]= 0.0f;
+	
+	cent[0]-= obedit->obmat[3][0];
+	cent[1]-= obedit->obmat[3][1];
+	cent[2]-= obedit->obmat[3][2];
+
+	if (rv3d) {
+		Mat3CpyMat4(imat, rv3d->viewmat);
+		Mat3MulVecfl(imat, cent);
+		Mat3MulMat3(cmat, imat, mat);
+		Mat3Inv(imat,cmat);
+		Mat3MulVecfl(imat, cent);
+	}
+
+	ml= MEM_callocN(sizeof(MetaElem), "metaelem");
+
+	ml->x= cent[0];
+	ml->y= cent[1];
+	ml->z= cent[2];
+	ml->quat[0]= 1.0;
+	ml->quat[1]= 0.0;
+	ml->quat[2]= 0.0;
+	ml->quat[3]= 0.0;
+	ml->rad= 2.0;
+	ml->s= 2.0;
+	ml->flag= SELECT | MB_SCALE_RAD;
+
+	switch(type) {
+	case MB_BALL:
+		ml->type = MB_BALL;
+		ml->expx= ml->expy= ml->expz= 1.0;
+		break;
+	case MB_TUBE:
+		ml->type = MB_TUBE;
+		ml->expx= ml->expy= ml->expz= 1.0;
+		break;
+	case MB_PLANE:
+		ml->type = MB_PLANE;
+		ml->expx= ml->expy= ml->expz= 1.0;
+		break;
+	case MB_ELIPSOID:
+		ml->type = MB_ELIPSOID;
+		ml->expx= 1.2f;
+		ml->expy= 0.8f;
+		ml->expz= 1.0;
+		break;
+	case MB_CUBE:
+		ml->type = MB_CUBE;
+		ml->expx= ml->expy= ml->expz= 1.0;
+		break;
+	default:
+		break;
+	}
+	
+	mball->lastelem= ml;
+	
+	return ml;
+}
+
+/***************************** Select/Deselect operator *****************************/
+
+/* Select or deselect all MetaElements */
+static int select_deselect_all_metaelems_exec(bContext *C, wmOperator *op)
+{
+	//Scene *scene= CTX_data_scene(C);
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb = (MetaBall*)obedit->data;
+	MetaElem *ml;
+	int any_sel= 0;
+	
+	/* Is any metaelem selected? */
+	ml= mb->editelems->first;
+	if(ml) {
+		while(ml) {
+			if(ml->flag & SELECT) break;
+			ml= ml->next;
+		}
+		if(ml) any_sel= 1;
+
+		ml= mb->editelems->first;
+		while(ml) {
+			if(any_sel) ml->flag &= ~SELECT;
+			else ml->flag |= SELECT;
+			ml= ml->next;
+		}
+		WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_SELECT, obedit);
+		//DAG_object_flush_update(scene, obedit, OB_RECALC_DATA);
+	}
+
+	return OPERATOR_FINISHED;
+}
+
+void MBALL_OT_select_deselect_all_metaelems(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Select/Deselect All";
+	ot->idname= "MBALL_OT_select_deselect_all_metaelems";
+
+	/* callback functions */
+	ot->exec= select_deselect_all_metaelems_exec;
+	ot->poll= ED_operator_editmball;
+
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;	
+}
+
+/***************************** Select inverse operator *****************************/
+
+/* Invert metaball selection */
+static int select_inverse_metaelems_exec(bContext *C, wmOperator *op)
+{
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb = (MetaBall*)obedit->data;
+	MetaElem *ml;
+	
+	ml= mb->editelems->first;
+	if(ml) {
+		while(ml) {
+			if(ml->flag & SELECT)
+				ml->flag &= ~SELECT;
+			else
+				ml->flag |= SELECT;
+			ml= ml->next;
+		}
+		WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_SELECT, obedit);
+	}
+	
+	return OPERATOR_FINISHED;
+}
+
+void MBALL_OT_select_inverse_metaelems(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Inverse";
+	ot->idname= "MBALL_OT_select_inverse_metaelems";
+
+	/* callback functions */
+	ot->exec= select_inverse_metaelems_exec;
+	ot->poll= ED_operator_editmball;
+
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;	
+}
+
+/***************************** Select random operator *****************************/
+
+/* Random metaball selection */
+static int select_random_metaelems_exec(bContext *C, wmOperator *op)
+{
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb = (MetaBall*)obedit->data;
+	MetaElem *ml;
+	float percent= RNA_float_get(op->ptr, "percent");
+	
+	if(percent == 0.0)
+		return OPERATOR_CANCELLED;
+	
+	ml= mb->editelems->first;
+	BLI_srand( BLI_rand() );	/* Random seed */
+	
+	/* Stupid version of random selection. Should be improved. */
+	while(ml) {
+		if(BLI_frand() < percent)
+			ml->flag |= SELECT;
+		else
+			ml->flag &= ~SELECT;
+		ml= ml->next;
+	}
+	
+	WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_SELECT, obedit);
+	
+	return OPERATOR_FINISHED;
+}
+
+
+void MBALL_OT_select_random_metaelems(struct wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Random...";
+	ot->idname= "MBALL_OT_select_random_metaelems";
+	
+	/* callback functions */
+	ot->exec= select_random_metaelems_exec;
+	ot->invoke= WM_operator_props_popup;
+	ot->poll= ED_operator_editmball;
+	
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
+	
+	/* properties */
+	RNA_def_float_percentage(ot->srna, "percent", 0.5f, 0.0f, 1.0f, "Percent", "Percentage of metaelems to select randomly.", 0.0001f, 1.0f);
+}
+
+/***************************** Duplicate operator *****************************/
+
+/* Duplicate selected MetaElements */
+static int duplicate_metaelems_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene= CTX_data_scene(C);
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb = (MetaBall*)obedit->data;
+	MetaElem *ml, *newml;
+	
+	ml= mb->editelems->last;
+	if(ml) {
+		while(ml) {
+			if(ml->flag & SELECT) {
+				newml= MEM_dupallocN(ml);
+				BLI_addtail(mb->editelems, newml);
+				mb->lastelem= newml;
+				ml->flag &= ~SELECT;
+			}
+			ml= ml->prev;
+		}
+		WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_DATA, obedit);
+		DAG_object_flush_update(scene, obedit, OB_RECALC_DATA);
+	}
+
+	return OPERATOR_FINISHED;
+}
+
+static int duplicate_metaelems_invoke(bContext *C, wmOperator *op, wmEvent *event)
+{
+	int retv= duplicate_metaelems_exec(C, op);
+	
+	if (retv == OPERATOR_FINISHED) {
+		RNA_int_set(op->ptr, "mode", TFM_TRANSLATION);
+		WM_operator_name_call(C, "TFM_OT_transform", WM_OP_INVOKE_REGION_WIN, op->ptr);
+	}
+	
+	return retv;
+}
+
+
+void MBALL_OT_duplicate_metaelems(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Duplicate";
+	ot->idname= "MBALL_OT_duplicate_metaelems";
+
+	/* callback functions */
+	ot->exec= duplicate_metaelems_exec;
+	ot->invoke= duplicate_metaelems_invoke;
+	ot->poll= ED_operator_editmball;
+
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
+	
+	/* to give to transform */
+	RNA_def_int(ot->srna, "mode", TFM_TRANSLATION, 0, INT_MAX, "Mode", "", 0, INT_MAX);
+}
+
+/***************************** Delete operator *****************************/
+
+/* Delete all selected MetaElems (not MetaBall) */
+static int delete_metaelems_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene= CTX_data_scene(C);
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb= (MetaBall*)obedit->data;
+	MetaElem *ml, *next;
+	
+	ml= mb->editelems->first;
+	if(ml) {
+		while(ml) {
+			next= ml->next;
+			if(ml->flag & SELECT) {
+				if(mb->lastelem==ml) mb->lastelem= NULL;
+				BLI_remlink(mb->editelems, ml);
+				MEM_freeN(ml);
+			}
+			ml= next;
+		}
+		WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_DATA, obedit);
+		DAG_object_flush_update(scene, obedit, OB_RECALC_DATA);
+	}
+
+	return OPERATOR_FINISHED;
+}
+
+void MBALL_OT_delete_metaelems(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Delete";
+	ot->idname= "MBALL_OT_delete_metaelems";
+
+	/* callback functions */
+	ot->exec= delete_metaelems_exec;
+	ot->poll= ED_operator_editmball;
+
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;	
+}
+
+/***************************** Hide operator *****************************/
+
+/* Hide selected MetaElems */
+static int hide_metaelems_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene= CTX_data_scene(C);
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb= (MetaBall*)obedit->data;
+	MetaElem *ml;
+	int hide_unselected= RNA_boolean_get(op->ptr, "unselected");
+
+	ml= mb->editelems->first;
+
+	if(ml) {
+		/* Hide unselected metaelems */
+		if(hide_unselected) {
+			while(ml){
+				if(!(ml->flag & SELECT))
+					ml->flag |= MB_HIDE;
+				ml= ml->next;
+			}
+		/* Hide selected metaelems */	
+		} else {
+			while(ml){
+				if(ml->flag & SELECT)
+					ml->flag |= MB_HIDE;
+				ml= ml->next;
+			}
+		}
+		WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_DATA, obedit);
+		DAG_object_flush_update(scene, obedit, OB_RECALC_DATA);
+	}
+
+	return OPERATOR_FINISHED;
+}
+
+void MBALL_OT_hide_metaelems(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Hide";
+	ot->idname= "MBALL_OT_hide_metaelems";
+
+	/* callback functions */
+	ot->exec= hide_metaelems_exec;
+	ot->poll= ED_operator_editmball;
+
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
+	
+	/* props */
+	RNA_def_boolean(ot->srna, "unselected", 0, "Unselected", "Hide unselected rather than selected.");
+}
+
+/***************************** Unhide operator *****************************/
+
+/* Unhide all edited MetaElems */
+static int reveal_metaelems_exec(bContext *C, wmOperator *op)
+{
+	Scene *scene= CTX_data_scene(C);
+	Object *obedit= CTX_data_edit_object(C);
+	MetaBall *mb= (MetaBall*)obedit->data;
+	MetaElem *ml;
+
+	ml= mb->editelems->first;
+
+	if(ml) {
+		while(ml) {
+			ml->flag &= ~MB_HIDE;
+			ml= ml->next;
+		}
+		WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_DATA, obedit);
+		DAG_object_flush_update(scene, obedit, OB_RECALC_DATA);
+	}
+	
+	return OPERATOR_FINISHED;
+}
+
+void MBALL_OT_reveal_metaelems(wmOperatorType *ot)
+{
+	/* identifiers */
+	ot->name= "Reveal";
+	ot->idname= "MBALL_OT_reveal_metaelems";
+	
+	/* callback functions */
+	ot->exec= reveal_metaelems_exec;
+	ot->poll= ED_operator_editmball;
+	
+	/* flags */
+	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;	
+}
+
+/* Select MetaElement with mouse click (user can select radius circle or
+ * stiffness circle) */
+void mouse_mball(bContext *C, short mval[2], int extend)
+{
+	static MetaElem *startelem=NULL;
+	Object *obedit= CTX_data_edit_object(C);
+	ViewContext vc;
+	MetaBall *mb = (MetaBall*)obedit->data;
+	MetaElem *ml, *act=NULL;
+	int a, hits;
+	unsigned int buffer[4*MAXPICKBUF];
+	rcti rect;
+
+	view3d_set_viewcontext(C, &vc);
+
+	rect.xmin= mval[0]-12;
+	rect.xmax= mval[0]+12;
+	rect.ymin= mval[1]-12;
+	rect.ymax= mval[1]+12;
+
+	hits= view3d_opengl_select(&vc, buffer, MAXPICKBUF, &rect);
+
+	/* does startelem exist? */
+	ml= mb->editelems->first;
+	while(ml) {
+		if(ml==startelem) break;
+		ml= ml->next;
+	}
+
+	if(ml==NULL) startelem= mb->editelems->first;
+	
+	if(hits>0) {
+		ml= startelem;
+		while(ml) {
+			for(a=0; a<hits; a++) {
+				/* index converted for gl stuff */
+				if(ml->selcol1==buffer[ 4 * a + 3 ]){
+					ml->flag |= MB_SCALE_RAD;
+					act= ml;
+				}
+				if(ml->selcol2==buffer[ 4 * a + 3 ]){
+					ml->flag &= ~MB_SCALE_RAD;
+					act= ml;
+				}
+			}
+			if(act) break;
+			ml= ml->next;
+			if(ml==NULL) ml= mb->editelems->first;
+			if(ml==startelem) break;
+		}
+		
+		/* When some metaelem was found, then it is neccessary to select or
+		 * deselet it. */
+		if(act) {
+			if(extend==0) {
+				/* Deselect all existing metaelems */
+				ml= mb->editelems->first;
+				while(ml) {
+					ml->flag &= ~SELECT;
+					ml= ml->next;
+				}
+				/* Select only metaelem clicked on */
+				act->flag |= SELECT;
+			}
+			else {
+				if(act->flag & SELECT)
+					act->flag &= ~SELECT;
+				else
+					act->flag |= SELECT;
+			}
+			mb->lastelem= act;
+			
+			WM_event_add_notifier(C, NC_OBJECT|ND_GEOM_SELECT, obedit);
+		}
+	}
+}
+
+
+/*  ************* undo for MetaBalls ************* */
+
+/* free all MetaElems from ListBase */
+static void freeMetaElemlist(ListBase *lb)
+{
+	MetaElem *ml, *next;
+
+	if(lb==NULL) return;
+
+	ml= lb->first;
+	while(ml){
+		next= ml->next;
+		BLI_remlink(lb, ml);
+		MEM_freeN(ml);
+		ml= next;
+	}
+
+	lb->first= lb->last= NULL;
+}
+
+
+static void undoMball_to_editMball(void *lbu, void *lbe)
+{
+	ListBase *lb= lbu;
+	ListBase *editelems= lbe;
+	MetaElem *ml, *newml;
+	
+	freeMetaElemlist(editelems);
+
+	/* copy 'undo' MetaElems to 'edit' MetaElems */
+	ml= lb->first;
+	while(ml){
+		newml= MEM_dupallocN(ml);
+		BLI_addtail(editelems, newml);
+		ml= ml->next;
+	}
+	
+}
+
+static void *editMball_to_undoMball(void *lbe)
+{
+	ListBase *editelems= lbe;
+	ListBase *lb;
+	MetaElem *ml, *newml;
+
+	/* allocate memory for undo ListBase */
+	lb= MEM_callocN(sizeof(ListBase), "listbase undo");
+	lb->first= lb->last= NULL;
+	
+	/* copy contents of current ListBase to the undo ListBase */
+	ml= editelems->first;
+	while(ml){
+		newml= MEM_dupallocN(ml);
+		BLI_addtail(lb, newml);
+		ml= ml->next;
+	}
+	
+	return lb;
+}
+
+/* free undo ListBase of MetaElems */
+static void free_undoMball(void *lbv)
+{
+	ListBase *lb= lbv;
+	
+	freeMetaElemlist(lb);
+	MEM_freeN(lb);
+}
+
+ListBase *metaball_get_editelems(Object *ob)
+{
+	if(ob && ob->type==OB_MBALL) {
+		struct MetaBall *mb= (struct MetaBall*)ob->data;
+		return mb->editelems;
+	}
+	return NULL;
+}
+
+
+static void *get_data(bContext *C)
+{
+	Object *obedit= CTX_data_edit_object(C);
+	return metaball_get_editelems(obedit);
+}
+
+/* this is undo system for MetaBalls */
+void undo_push_mball(bContext *C, char *name)
+{
+	undo_editmode_push(C, name, get_data, free_undoMball, undoMball_to_editMball, editMball_to_undoMball, NULL);
+}
+
diff --git a/source/blender/editors/metaball/mball_intern.h b/source/blender/editors/metaball/mball_intern.h
new file mode 100644
index 00000000000..8cf749733dd
--- /dev/null
+++ b/source/blender/editors/metaball/mball_intern.h
@@ -0,0 +1,47 @@
+/**
+ * $Id$
+ *
+ * ***** 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 ED_MBALL_INTERN_H
+#define ED_MBALL_INTERN_H
+
+#include "DNA_object_types.h"
+
+#include "DNA_windowmanager_types.h"
+
+void MBALL_OT_hide_metaelems(struct wmOperatorType *ot);
+void MBALL_OT_reveal_metaelems(struct wmOperatorType *ot);
+
+void MBALL_OT_delete_metaelems(struct wmOperatorType *ot);
+void MBALL_OT_duplicate_metaelems(struct wmOperatorType *ot);
+
+void MBALL_OT_select_deselect_all_metaelems(struct wmOperatorType *ot);
+void MBALL_OT_select_inverse_metaelems(struct wmOperatorType *ot);
+void MBALL_OT_select_random_metaelems(struct wmOperatorType *ot);
+
+#endif
+
diff --git a/source/blender/editors/metaball/mball_ops.c b/source/blender/editors/metaball/mball_ops.c
new file mode 100644
index 00000000000..38593af372f
--- /dev/null
+++ b/source/blender/editors/metaball/mball_ops.c
@@ -0,0 +1,68 @@
+/**
+ * $Id$
+ *
+ * ***** 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 *****
+ */
+
+#include "WM_api.h"
+#include "WM_types.h"
+
+#include "RNA_access.h"
+
+#include "DNA_listBase.h"
+#include "DNA_windowmanager_types.h"
+
+#include "mball_intern.h"
+
+void ED_operatortypes_metaball(void)
+{
+	WM_operatortype_append(MBALL_OT_delete_metaelems);
+	WM_operatortype_append(MBALL_OT_duplicate_metaelems);
+	
+	WM_operatortype_append(MBALL_OT_hide_metaelems);
+	WM_operatortype_append(MBALL_OT_reveal_metaelems);
+	
+	WM_operatortype_append(MBALL_OT_select_deselect_all_metaelems);
+	WM_operatortype_append(MBALL_OT_select_inverse_metaelems);
+	WM_operatortype_append(MBALL_OT_select_random_metaelems);
+}
+
+void ED_keymap_metaball(wmWindowManager *wm)
+{
+	ListBase *keymap= WM_keymap_listbase(wm, "Metaball", 0, 0);
+
+	WM_keymap_add_item(keymap, "OBJECT_OT_metaball_add", AKEY, KM_PRESS, KM_SHIFT, 0);
+	
+	WM_keymap_add_item(keymap, "MBALL_OT_reveal_metaelems", HKEY, KM_PRESS, KM_ALT, 0);
+	WM_keymap_add_item(keymap, "MBALL_OT_hide_metaelems", HKEY, KM_PRESS, 0, 0);
+	RNA_enum_set(WM_keymap_add_item(keymap, "MBALL_OT_hide_metaelems", HKEY, KM_PRESS, KM_SHIFT, 0)->ptr, "unselected", 1);
+	
+	WM_keymap_add_item(keymap, "MBALL_OT_delete_metaelems", XKEY, KM_PRESS, 0, 0);
+	WM_keymap_add_item(keymap, "MBALL_OT_duplicate_metaelems", DKEY, KM_PRESS, KM_SHIFT, 0);
+	
+	WM_keymap_add_item(keymap, "MBALL_OT_select_deselect_all_metaelems", AKEY, KM_PRESS, 0, 0);
+	WM_keymap_add_item(keymap, "MBALL_OT_select_inverse_metaelems", IKEY, KM_PRESS, KM_CTRL, 0);
+}
+