- added ModifierTypeInfo.updateDepgraph function, responsible for building

appropriate relations in dep graph (modifiers respond to scene changes
   correctly now)
 - update modifier buttons to trigger depgraph rebuild if needed

source/blender/blenkernel/BKE_modifier.h

@@ -35,6 +35,8 @@
 
 struct DerivedMesh;
 struct ModifierData;
+struct DagForest;
+struct DagNode;
 struct Object;
 
 typedef enum {
@@ -79,6 +81,13 @@ typedef struct ModifierTypeInfo {
 		 */
 	int (*isDisabled)(struct ModifierData *md);
 
+		/* Add the appropriate relations to the DEP graph depending on the modifier
+		 * data. 
+		 *
+		 * This function is optional.
+		 */
+	void (*updateDepgraph)(struct ModifierData *md, struct DagForest *forest, struct Object *ob, struct DagNode *obNode);
+
 		/* Only for deform types, should apply the deformation
 		 * to the given vertex array. Object is guaranteed to be
 		 * non-NULL.

source/blender/blenkernel/intern/depsgraph.c

@@ -48,6 +48,7 @@
 #include "DNA_effect_types.h"
 #include "DNA_lattice_types.h"
 #include "DNA_mesh_types.h"
+#include "DNA_modifier_types.h"
 #include "DNA_object_types.h"
 #include "DNA_object_force.h"
 #include "DNA_oops_types.h"
@@ -59,6 +60,7 @@
 #include "BKE_action.h"
 #include "BKE_global.h"
 #include "BKE_mball.h"
+#include "BKE_modifier.h"
 #include "BKE_utildefines.h"
 
 #include "MEM_guardedalloc.h"
@@ -360,6 +362,15 @@ struct DagForest *build_dag(struct Scene *sce, short mask)
 				}
 			}
 		}
+		if (ob->modifiers.first) {
+			ModifierData *md;
+
+			for(md=ob->modifiers.first; md; md=md->next) {
+				ModifierTypeInfo *mti = modifierType_get_info(md->type);
+
+				if (mti->updateDepgraph) mti->updateDepgraph(md, dag, ob, node);
+			}
+		}
 		if (ob->parent) {
 			node2 = dag_get_node(dag,ob->parent);
 			

source/blender/blenkernel/intern/modifier.c

@@ -13,6 +13,7 @@
 #include "BKE_modifier.h"
 #include "BKE_lattice.h"
 #include "BKE_subsurf.h"
+#include "depsgraph_private.h"
 
 /***/
 
@@ -49,6 +50,17 @@ static int curveModifier_isDisabled(ModifierData *md)
 	return !cmd->object;
 }
 
+static void curveModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
+{
+	CurveModifierData *cmd = (CurveModifierData*) md;
+
+	if (cmd->object) {
+		DagNode *curNode = dag_get_node(forest, cmd->object);
+
+		dag_add_relation(forest, curNode, obNode, DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
+	}
+}
+
 static void curveModifier_deformVerts(ModifierData *md, Object *ob, float (*vertexCos)[3], int numVerts)
 {
 	CurveModifierData *cmd = (CurveModifierData*) md;
@@ -70,6 +82,17 @@ static int latticeModifier_isDisabled(ModifierData *md)
 	return !lmd->object;
 }
 
+static void latticeModifier_updateDepgraph(ModifierData *md, DagForest *forest, Object *ob, DagNode *obNode)
+{
+	LatticeModifierData *lmd = (LatticeModifierData*) md;
+
+	if (lmd->object) {
+		DagNode *latNode = dag_get_node(forest, lmd->object);
+
+		dag_add_relation(forest, latNode, obNode, DAG_RL_DATA_DATA|DAG_RL_OB_DATA);
+	}
+}
+
 static void latticeModifier_deformVerts(ModifierData *md, Object *ob, float (*vertexCos)[3], int numVerts)
 {
 	LatticeModifierData *lmd = (LatticeModifierData*) md;
@@ -149,6 +172,7 @@ ModifierTypeInfo *modifierType_get_info(ModifierType type)
 		mti->flags = eModifierTypeFlag_AcceptsCVs;
 		mti->allocData = curveModifier_allocData;
 		mti->isDisabled = curveModifier_isDisabled;
+		mti->updateDepgraph = curveModifier_updateDepgraph;
 		mti->deformVerts = curveModifier_deformVerts;
 
 		mti = &typeArr[eModifierType_Lattice];
@@ -158,6 +182,7 @@ ModifierTypeInfo *modifierType_get_info(ModifierType type)
 		mti->flags = eModifierTypeFlag_AcceptsCVs;
 		mti->allocData = latticeModifier_allocData;
 		mti->isDisabled = latticeModifier_isDisabled;
+		mti->updateDepgraph = latticeModifier_updateDepgraph;
 		mti->deformVerts = latticeModifier_deformVerts;
 
 		mti = &typeArr[eModifierType_Subsurf];

source/blender/src/buttons_object.c

@@ -1823,10 +1823,10 @@ static void object_panel_modifiers(Object *ob)
 				uiDefButS(block, MENU, B_MAKEDISP, subsurfmenu,		550,280,150,19, &(smd->subdivType), 0, 0, 0, 0, "Selects type of subdivision algorithm.");
 			} else if (md->type==eModifierType_Lattice) {
 				LatticeModifierData *lmd = (LatticeModifierData*) md;
-				uiDefIDPoinBut(block, modifier_testLatticeObj, B_MAKEDISP, "Ob:",		550, 320, 120,19, &lmd->object, "Lattice object to deform with");
+				uiDefIDPoinBut(block, modifier_testLatticeObj, B_CHANGEDEP, "Ob:",		550, 320, 120,19, &lmd->object, "Lattice object to deform with");
 			} else if (md->type==eModifierType_Curve) {
 				CurveModifierData *cmd = (CurveModifierData*) md;
-				uiDefIDPoinBut(block, modifier_testCurveObj, B_MAKEDISP, "Ob:",		550, 320, 120,19, &cmd->object, "Lattice object to deform with");
+				uiDefIDPoinBut(block, modifier_testCurveObj, B_CHANGEDEP, "Ob:",		550, 320, 120,19, &cmd->object, "Lattice object to deform with");
 			}
 			uiBlockEndAlign(block);
 		}