Index: source/blender/blenkernel/BKE_global.h
===================================================================
--- source/blender/blenkernel/BKE_global.h	(revision 16743)
+++ source/blender/blenkernel/BKE_global.h	(working copy)
@@ -142,6 +142,8 @@
 	/* Janco's playing ground */
 	struct bSoundListener* listener;
 
+	int inviewmove; /* indicator for viewmove mode */
+
 	/* Test thingy for Nzc */
 	int compat;      /* toggle compatibility mode for edge rendering */
 	int notonlysolid;/* T-> also edge-render transparent faces       */
Index: source/blender/makesdna/DNA_userdef_types.h
===================================================================
--- source/blender/makesdna/DNA_userdef_types.h	(revision 16743)
+++ source/blender/makesdna/DNA_userdef_types.h	(working copy)
@@ -246,6 +246,7 @@
 #define USER_RELPATHS			(1 << 20)
 #define USER_DRAGIMMEDIATE		(1 << 21)
 #define USER_DONT_DOSCRIPTLINKS	(1 << 22)
+#define USER_SHOW_ORBIT_CENTER	(1 << 23)
 
 /* viewzom */
 #define USER_ZOOM_CONT			0
Index: source/blender/src/drawview.c
===================================================================
--- source/blender/src/drawview.c	(revision 16743)
+++ source/blender/src/drawview.c	(working copy)
@@ -679,6 +679,35 @@
 	}
 }
 
+static void draworbitcenter()
+{
+	View3D *v3d = G.vd;
+	float size;
+	float iofs[3];
+	/* get center of the orbit */
+	VECCOPY(iofs, v3d->ofs);
+	VecMulf(iofs, -1.0f);
+	
+	/* size calculation from drawobject.c's center drawing function */
+	size= v3d->persmat[0][3]*iofs[0]+ v3d->persmat[1][3]*iofs[1]+ v3d->persmat[2][3]*iofs[2]+ v3d->persmat[3][3];
+	size*= v3d->pixsize*((float)U.obcenter_dia*0.5f);
+
+	/* Do the draw without depth test using one color, and then with depth test using another.
+	 * We can distinguish now between 'inside something' state and 'outside' state.
+	 */
+	if (v3d->zbuf) glDisable(GL_DEPTH_TEST);
+	glEnable(GL_BLEND);
+	BIF_ThemeColorShadeAlpha(TH_TRANSFORM, 0, -120);
+	drawcircball(GL_POLYGON, iofs, size, v3d->viewinv);
+	glDisable(GL_BLEND);
+	if (v3d->zbuf) glEnable(GL_DEPTH_TEST);
+	
+	BIF_ThemeColorShade(TH_ACTIVE, 0);
+	drawcircball(GL_POLYGON, iofs, size, v3d->viewinv);
+	BIF_ThemeColorShade(TH_WIRE, 0);
+	drawcircball(GL_LINE_LOOP, iofs, size, v3d->viewinv);
+}
+
 /* ********* custom clipping *********** */
 
 static void view3d_draw_clipping(View3D *v3d)
@@ -3228,6 +3257,7 @@
 	// needs to be done always, gridview is adjusted in drawgrid() now
 	v3d->gridview= v3d->grid;
 	
+
 	if(v3d->view==0 || v3d->persp!=0) {
 		drawfloor();
 		if(v3d->persp==2) {
@@ -3312,6 +3342,7 @@
 	if(G.scene->radio) RAD_drawall(v3d->drawtype>=OB_SOLID);
 	
 	/* Transp and X-ray afterdraw stuff */
+	if((U.flag & USER_SHOW_ORBIT_CENTER) && G.inviewmove) draworbitcenter();
 	view3d_draw_transp(v3d);
 	view3d_draw_xray(v3d, 1);	// clears zbuffer if it is used!
 
Index: source/blender/src/space.c
===================================================================
--- source/blender/src/space.c	(revision 16743)
+++ source/blender/src/space.c	(working copy)
@@ -3820,6 +3820,12 @@
 		uiDefBut(block, LABEL,0,"View rotation:",
 			(xpos+(2*edgsp)+mpref+(2*spref)+(2*midsp)),y3label,mpref,buth,
 			0, 0, 0, 0, 0, "");
+		
+		uiDefButBitI(block, TOG, USER_SHOW_ORBIT_CENTER, B_DRAWINFO, "Orbit Center",
+			(xpos+edgsp+mpref+(2*spref)+(3*midsp)+(mpref/2)),y3,(mpref/2),buth,
+			&(U.flag), 0, 0, 0, 0,
+			"Show center of the camera orbit during view rotation/translation/scale");
+
 		uiBlockBeginAlign(block);
 		uiBlockSetCol(block, TH_BUT_SETTING1);	/* mutually exclusive toggles, start color */
 		uiDefButBitI(block, TOG, USER_TRACKBALL, B_DRAWINFO, "Trackball",
Index: source/blender/src/view.c
===================================================================
--- source/blender/src/view.c	(revision 16743)
+++ source/blender/src/view.c	(working copy)
@@ -984,6 +984,7 @@
 	if (G.vd->persmat[2][1] < 0.0f)
 		reverse= -1.0f;
 
+	G.inviewmove = 1; /* indicate a viewmove loop state */
 	while(TRUE) {
 		getmouseco_sc(mval);
 		
@@ -1284,6 +1285,7 @@
 		/* this in the end, otherwise get_mbut does not work on a PC... */
 		if( !(get_mbut() & (L_MOUSE|M_MOUSE))) break;
 	}
+	G.inviewmove = 0; /* we're out of viewmove mode */
 
 	if(G.vd->depths) G.vd->depths->damaged= 1;
 	retopo_queue_updates(G.vd);