Added an "Exponent" slider to Color Boundary brush.

release/scripts/startup/bl_ui/properties_paint_common.py

@@ -571,7 +571,6 @@ def brush_settings(layout, context, brush, popover=False):
         if capabilities.has_vcol_boundary_smooth:
             layout.prop(brush, "vcol_boundary_factor", slider=True)
 
-        # topology_rake_factor
         if (
                 capabilities.has_topology_rake and
                 context.sculpt_object.use_dynamic_topology_sculpting
@@ -637,6 +636,10 @@ def brush_settings(layout, context, brush, popover=False):
 
         # Per sculpt tool options.
 
+        if sculpt_tool == "VCOL_BOUNDARY":
+            row = layout.row()
+            row.prop(brush, "vcol_boundary_exponent")
+
         if sculpt_tool == 'CLAY_STRIPS':
             row = layout.row()
             row.prop(brush, "tip_roundness")

source/blender/blenloader/intern/versioning_290.c

@@ -1128,6 +1128,16 @@ void blo_do_versions_290(FileData *fd, Library *UNUSED(lib), Main *bmain)
     }
   }
 
+  if (!MAIN_VERSION_ATLEAST(bmain, 293, 0)) {
+    for (Brush *br = bmain->brushes.first; br; br = br->id.next) {
+      if (br->sculpt_tool == SCULPT_TOOL_VCOL_BOUNDARY) {
+        if (br->vcol_boundary_exponent == 0.0f) {
+          br->vcol_boundary_exponent = 1.0f;
+        }
+      }
+    }
+  }
+
   /**
    * Versioning code until next subversion bump goes here.
    *

source/blender/editors/sculpt_paint/sculpt_smooth.c

@@ -729,6 +729,13 @@ static void do_smooth_vcol_boundary_brush_task_cb_ex(void *__restrict userdata,
 
   mul_v3_fl(avg, tot);
 
+  float exp = brush->vcol_boundary_exponent;
+  //detect bad value
+
+  if (exp == 0.0f) {
+    exp = 1.0f;
+  }
+
   //#define SHARPEN_VCOL_BOUNDARY
 
   BKE_pbvh_vertex_iter_begin(ss->pbvh, data->nodes[n], vd, PBVH_ITER_UNIQUE)
@@ -775,7 +782,9 @@ static void do_smooth_vcol_boundary_brush_task_cb_ex(void *__restrict userdata,
         sub_v4_v4v4(dv, col, avg);
         float w = (fabs(dv[0]) + fabs(dv[1]) + fabs(dv[2]) + fabs(dv[3])) / 4.0;
 
-        w *= w;
+        w = powf(w, exp);
+
+        //w *= w;
 
 #ifdef SHARPEN_VCOL_BOUNDARY
         float w2 = -1.0f;

source/blender/makesdna/DNA_brush_types.h

@@ -543,7 +543,7 @@ typedef struct Brush {
   /** Source for fill tool color gradient application. */
   char gradient_fill_mode;
 
-  char _pad0[5];
+  char _pad0[1];
 
   /** Projection shape (sphere, circle). */
   char falloff_shape;
@@ -577,6 +577,7 @@ typedef struct Brush {
 
   float topology_rake_factor;
   float vcol_boundary_factor;
+  float vcol_boundary_exponent;
 
   float crease_pinch_factor;
 

source/blender/makesrna/intern/rna_brush.c

@@ -2837,7 +2837,7 @@ static void rna_def_brush(BlenderRNA *brna)
                            "Best used on low-poly meshes as it has a performance impact");
   RNA_def_property_update(prop, 0, "rna_Brush_update");
 
-    prop = RNA_def_property(srna, "vcol_boundary_factor", PROP_FLOAT, PROP_FACTOR);
+  prop = RNA_def_property(srna, "vcol_boundary_factor", PROP_FLOAT, PROP_FACTOR);
   RNA_def_property_float_sdna(prop, NULL, "vcol_boundary_factor");
   RNA_def_property_float_default(prop, 0);
   RNA_def_property_range(prop, 0.0f, 1.0f);
@@ -2848,6 +2848,16 @@ static void rna_def_brush(BlenderRNA *brna)
                            "to generate sharper features. ");
   RNA_def_property_update(prop, 0, "rna_Brush_update");
 
+    prop = RNA_def_property(srna, "vcol_boundary_exponent", PROP_FLOAT, PROP_FACTOR);
+  RNA_def_property_float_sdna(prop, NULL, "vcol_boundary_exponent");
+  RNA_def_property_float_default(prop, 0);
+  RNA_def_property_range(prop, 0.0f, 6.0f);
+  RNA_def_property_ui_range(prop, 0.1f, 3.0f, 0.001, 3);
+  RNA_def_property_ui_text(prop,
+                           "Exponent",
+                           "Hardening exponent (smaller value smoother edges)");
+  RNA_def_property_update(prop, 0, "rna_Brush_update");
+
   prop = RNA_def_property(srna, "tilt_strength_factor", PROP_FLOAT, PROP_FACTOR);
   RNA_def_property_float_sdna(prop, NULL, "tilt_strength_factor");
   RNA_def_property_float_default(prop, 0);