Fix for properly unlinking target object pointers when objects are deleted

from scenes.

source/blender/blenkernel/BKE_linestyle.h

@@ -39,6 +39,7 @@
 #define LS_MODIFIER_TYPE_THICKNESS  3
 
 struct Main;
+struct Object;
 
 FreestyleLineStyle *FRS_new_linestyle(char *name, struct Main *main);
 void FRS_free_linestyle(FreestyleLineStyle *linestyle);
@@ -58,4 +59,6 @@ void FRS_move_linestyle_thickness_modifier(FreestyleLineStyle *linestyle, LineSt
 void FRS_list_modifier_color_ramps(FreestyleLineStyle *linestyle, ListBase *listbase);
 char *FRS_path_from_ID_to_color_ramp(FreestyleLineStyle *linestyle, ColorBand *color_ramp);
 
+void FRS_unlink_linestyle_target_object(FreestyleLineStyle *linestyle, struct Object *ob);
+
 #endif

source/blender/blenkernel/intern/linestyle.c

@@ -368,3 +368,30 @@ char *FRS_path_from_ID_to_color_ramp(FreestyleLineStyle *linestyle, ColorBand *c
 found:
 	return BLI_sprintfN("color_modifiers[\"%s\"].color_ramp", m->name);
 }
+
+void FRS_unlink_linestyle_target_object(FreestyleLineStyle *linestyle, struct Object *ob)
+{
+	LineStyleModifier *m;
+
+	for (m = (LineStyleModifier *)linestyle->color_modifiers.first; m; m = m->next) {
+		if (m->type == LS_MODIFIER_DISTANCE_FROM_OBJECT) {
+			if (((LineStyleColorModifier_DistanceFromObject *)m)->target == ob) {
+				((LineStyleColorModifier_DistanceFromObject *)m)->target = NULL;
+			}
+		}
+	}
+	for (m = (LineStyleModifier *)linestyle->alpha_modifiers.first; m; m = m->next) {
+		if (m->type == LS_MODIFIER_DISTANCE_FROM_OBJECT) {
+			if (((LineStyleAlphaModifier_DistanceFromObject *)m)->target == ob) {
+				((LineStyleAlphaModifier_DistanceFromObject *)m)->target = NULL;
+			}
+		}
+	}
+	for (m = (LineStyleModifier *)linestyle->thickness_modifiers.first; m; m = m->next) {
+		if (m->type == LS_MODIFIER_DISTANCE_FROM_OBJECT) {
+			if (((LineStyleThicknessModifier_DistanceFromObject *)m)->target == ob) {
+				((LineStyleThicknessModifier_DistanceFromObject *)m)->target = NULL;
+			}
+		}
+	}
+}

source/blender/blenkernel/intern/object.c

@@ -102,6 +102,8 @@
 
 #include "GPU_material.h"
 
+#include "FRS_freestyle.h"
+
 /* Local function protos */
 static void solve_parenting (Scene *scene, Object *ob, Object *par, float obmat[][4], float slowmat[][4], int simul);
 
@@ -577,6 +579,14 @@ void unlink_object(Object *ob)
 					}
 				SEQ_END
 			}
+
+			{
+				SceneRenderLayer *srl;
+
+				for (srl= sce->r.layers.first; srl; srl= srl->next) {
+					FRS_unlink_target_object(&srl->freestyleConfig, ob);
+				}
+			}
 		}
 
 		sce= sce->id.next;

source/blender/freestyle/FRS_freestyle.h

@@ -39,6 +39,7 @@ extern "C" {
 	#include "DNA_scene_types.h"
 	
 	#include "BKE_context.h"
+	#include "BKE_object.h"
 	
 	extern Scene *freestyle_scene;
 	extern float freestyle_viewpoint[3];
@@ -71,6 +72,8 @@ extern "C" {
 	short FRS_get_active_lineset_index(FreestyleConfig *config);
 	void FRS_set_active_lineset_index(FreestyleConfig *config, short index);
 
+	void FRS_unlink_target_object(FreestyleConfig *config, struct Object *ob);
+
 #ifdef __cplusplus
 }
 #endif

source/blender/freestyle/intern/blender_interface/FRS_freestyle.cpp

@@ -519,6 +519,15 @@ extern "C" {
 		}
 	}
 
+	void FRS_unlink_target_object(FreestyleConfig *config, Object *ob)
+	{
+		FreestyleLineSet *lineset;
+
+		for(lineset=(FreestyleLineSet *)config->linesets.first; lineset; lineset=lineset->next) {
+			FRS_unlink_linestyle_target_object(lineset->linestyle, ob);
+		}
+	}
+
 #ifdef __cplusplus
 }
 #endif