diff --git a/release/scripts/modules/view3d_utils.py b/release/scripts/modules/view3d_utils.py
index a4e05e7e1c0..15f5aaa20b7 100644
--- a/release/scripts/modules/view3d_utils.py
+++ b/release/scripts/modules/view3d_utils.py
@@ -65,7 +65,7 @@ def region_2d_to_location_3d(region, rv3d, coord, depth_location):
     from mathutils.geometry import intersect_point_line
     origin_start = rv3d.view_matrix.inverted()[3].to_3d()
     origin_end = origin_start + region_2d_to_vector_3d(region, rv3d, coord)
-    return intersect_point_line(depth_vector, origin_start, origin_end)[0]
+    return intersect_point_line(depth_location, origin_start, origin_end)[0]
 
 
 def location_3d_to_region_2d(region, rv3d, coord):
diff --git a/source/blender/editors/space_view3d/view3d_edit.c b/source/blender/editors/space_view3d/view3d_edit.c
index 30bfc355480..fb0a33674f7 100644
--- a/source/blender/editors/space_view3d/view3d_edit.c
+++ b/source/blender/editors/space_view3d/view3d_edit.c
@@ -396,7 +396,7 @@ static void viewops_data_create(bContext *C, wmOperator *op, wmEvent *event)
 	}
 
 	/* for dolly */
-	window_to_3d_vector(vod->ar, vod->mousevec, (vod->oldx - vod->ar->winrct.xmin)-(vod->ar->winx)/2, (vod->oldy - vod->ar->winrct.ymin)-(vod->ar->winy)/2);
+	window_to_3d_vector(vod->ar, vod->mousevec, vod->oldx - vod->ar->winrct.xmin, vod->oldy - vod->ar->winrct.ymin);
 
 	/* lookup, we dont pass on v3d to prevent confusement */
 	vod->grid= v3d->grid;
@@ -1349,7 +1349,7 @@ void VIEW3D_OT_zoom(wmOperatorType *ot)
 static void view_dolly_mouseloc(ARegion *ar, float orig_ofs[3], float dvec[3], float dfac)
 {
 	RegionView3D *rv3d= ar->regiondata;
-	madd_v3_v3v3fl(rv3d->ofs, orig_ofs, dvec, 1.0 - dfac);
+	madd_v3_v3v3fl(rv3d->ofs, orig_ofs, dvec, -(1.0 - dfac));
 }
 
 static void viewdolly_apply(ViewOpsData *vod, int x, int y, const short zoom_invert)
@@ -1444,7 +1444,8 @@ static int viewdolly_exec(bContext *C, wmOperator *op)
 	else {
 		sa= CTX_wm_area(C);
 		ar= CTX_wm_region(C);
-		normalize_v3_v3(mousevec, ((RegionView3D *)ar->regiondata)->viewinv[2]);
+		negate_v3_v3(mousevec, ((RegionView3D *)ar->regiondata)->viewinv[2]);
+		normalize_v3(mousevec);
 	}
 
 	/* v3d= sa->spacedata.first; */ /* UNUSED */
@@ -1498,7 +1499,8 @@ static int viewdolly_invoke(bContext *C, wmOperator *op, wmEvent *event)
 
 		/* overwrite the mouse vector with the view direction (zoom into the center) */
 		if((U.uiflag & USER_ZOOM_TO_MOUSEPOS) == 0) {
-			normalize_v3_v3(vod->mousevec, vod->rv3d->viewinv[2]);
+			negate_v3_v3(vod->mousevec, vod->rv3d->viewinv[2]);
+			normalize_v3(vod->mousevec);
 		}
 
 		if (event->type == MOUSEZOOM) {
diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index b46c7236170..f8a5a5ad78a 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -687,15 +687,15 @@ void window_to_3d_vector(ARegion *ar, float out[3], short mx, short my)
 	float dx, dy;
 	float viewvec[3];
 
-	dx= 2.0f*mx/ar->winx;
-	dy= 2.0f*my/ar->winy;
+	dx= (2.0f * mx / ar->winx) - 1.0f;
+	dy= (2.0f * my / ar->winy) - 1.0f;
 
 	/* normalize here so vecs are proportional to eachother */
 	normalize_v3_v3(viewvec, rv3d->viewinv[2]);
 
-	out[0]= viewvec[0] - (rv3d->persinv[0][0]*dx + rv3d->persinv[1][0]*dy);
-	out[1]= viewvec[1] - (rv3d->persinv[0][1]*dx + rv3d->persinv[1][1]*dy);
-	out[2]= viewvec[2] - (rv3d->persinv[0][2]*dx + rv3d->persinv[1][2]*dy);
+	out[0]= (rv3d->persinv[0][0]*dx + rv3d->persinv[1][0]*dy) - viewvec[0];
+	out[1]= (rv3d->persinv[0][1]*dx + rv3d->persinv[1][1]*dy) - viewvec[1];
+	out[2]= (rv3d->persinv[0][2]*dx + rv3d->persinv[1][2]*dy) - viewvec[2];
 
 	normalize_v3(out);
 }