Boolean Modifier: add debug options

Only show & use when running in debug mode.

release/scripts/startup/bl_ui/properties_data_modifier.py

@@ -146,9 +146,10 @@ class DATA_PT_modifiers(ModifierButtonsPanel, Panel):
         layout.row().prop(md, "offset_type", expand=True)
 
     def BOOLEAN(self, layout, ob, md):
+        solver = md.solver
         if not bpy.app.build_options.mod_boolean:
-            layout.label("Built without Boolean modifier")
-            return
+            if solver == 'CARVE':
+                layout.label("Built without Carve solver")
 
         split = layout.split()
 
@@ -164,9 +165,13 @@ class DATA_PT_modifiers(ModifierButtonsPanel, Panel):
         split.column().label(text="Solver:")
         split.column().prop(md, "solver", text="")
 
-        if md.solver == 'BMESH':
+        if solver == 'BMESH':
             layout.prop(md, "double_threshold")
 
+            if bpy.app.debug:
+                layout.prop(md, "debug_options")
+
+
     def BUILD(self, layout, ob, md):
         split = layout.split()
 

source/blender/makesdna/DNA_modifier_types.h

@@ -654,7 +654,8 @@ typedef struct BooleanModifierData {
 	struct Object *object;
 	char operation;
 	char solver;
-	char pad[2];
+	char pad;
+	char bm_flag;
 	float double_threshold;
 } BooleanModifierData;
 
@@ -669,6 +670,13 @@ typedef enum {
 	eBooleanModifierSolver_BMesh = 1,
 } BooleanSolver;
 
+/* bm_flag (only used when G_DEBUG) */
+enum {
+	eBooleanModifierBMeshFlag_BMesh_Separate            = (1 << 0),
+	eBooleanModifierBMeshFlag_BMesh_NoDissolve          = (1 << 1),
+	eBooleanModifierBMeshFlag_BMesh_NoConnectRegions    = (1 << 2),
+};
+
 typedef struct MDefInfluence {
 	int vertex;
 	float weight;

source/blender/makesrna/intern/rna_modifier.c

@@ -1977,6 +1977,23 @@ static void rna_def_modifier_boolean(BlenderRNA *brna)
 	RNA_def_property_ui_range(prop, 0, 1, 0.0001, 6);
 	RNA_def_property_ui_text(prop, "Overlap Threshold",  "Threshold for checking overlapping geometry");
 	RNA_def_property_update(prop, 0, "rna_Modifier_update");
+
+	/* BMesh debugging options, only used when G_DEBUG is set */
+
+	/* BMesh intersection options */
+	static EnumPropertyItem debug_items[] = {
+		{eBooleanModifierBMeshFlag_BMesh_Separate, "SEPARATE", 0, "Separate", ""},
+		{eBooleanModifierBMeshFlag_BMesh_NoDissolve, "NO_DISSOLVE", 0, "NoDissolve", ""},
+		{eBooleanModifierBMeshFlag_BMesh_NoConnectRegions, "NO_CONNECT_REGIONS", 0, "NoConnectRegions", ""},
+		{0, NULL, 0, NULL, NULL}
+	};
+
+	prop = RNA_def_property(srna, "debug_options", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_items(prop, debug_items);
+	RNA_def_property_enum_sdna(prop, NULL, "bm_flag");
+	RNA_def_property_flag(prop, PROP_ENUM_FLAG);
+	RNA_def_property_ui_text(prop, "Debug", "Debugging options, only when started with '-d'");
+	RNA_def_property_update(prop, 0, "rna_Modifier_update");
 }
 
 static void rna_def_modifier_array(BlenderRNA *brna)

source/blender/modifiers/intern/MOD_boolean.c

@@ -59,6 +59,7 @@
 #include "BLI_alloca.h"
 #include "BLI_math_geom.h"
 #include "BKE_material.h"
+#include "BKE_global.h"  /* only to check G.debug */
 #include "MEM_guardedalloc.h"
 
 #include "bmesh.h"
@@ -322,11 +323,17 @@ static DerivedMesh *applyModifier_bmesh(
 				 * currently this is ok for 'BM_mesh_intersect' */
 				// BM_mesh_normals_update(bm);
 
-				/* change for testing */
 				bool use_separate = false;
 				bool use_dissolve = true;
 				bool use_island_connect = true;
 
+				/* change for testing */
+				if (G.debug & G_DEBUG) {
+					use_separate = (bmd->bm_flag & eBooleanModifierBMeshFlag_BMesh_Separate) != 0;
+					use_dissolve = (bmd->bm_flag & eBooleanModifierBMeshFlag_BMesh_NoDissolve) == 0;
+					use_island_connect = (bmd->bm_flag & eBooleanModifierBMeshFlag_BMesh_NoConnectRegions) == 0;
+				}
+
 				BM_mesh_intersect(
 				        bm,
 				        looptris, tottri,