scripts-blender/addons/brushstroke_tools/ops.py

@@ -1,6 +1,7 @@
 import bpy
 import random
 from . import utils
+import mathutils
 
 class BSBST_OT_new_brushstrokes(bpy.types.Operator):
     """ Create new object according to method and type.
@@ -155,6 +156,27 @@ class BSBST_OT_new_brushstrokes(bpy.types.Operator):
         # transfer modifier info data from preset to brush strokes
         utils.deep_copy_mod_info(settings.preset_object, brushstrokes_object)
 
+        # estimate dimensions
+
+        if settings.estimate_dimensions:
+            bb_min = mathutils.Vector(surface_object.bound_box[0])
+            bb_max = mathutils.Vector(surface_object.bound_box[6])
+            bb_radius = mathutils.Vector([abs(co) for co in bb_max-bb_min]).length * 0.5
+
+            surf_est = 4 * 3.142 * bb_radius**2
+
+            mod = brushstrokes_object.modifiers['Brushstrokes']
+            if settings.brushstroke_method == 'SURFACE_FILL':
+                # set density
+                mod['Socket_7'] = utils.round_n(1000 / surf_est, 2)
+                # set length
+                mod['Socket_11'] = utils.round_n(bb_radius * 0.5, 2)
+                # set width
+                mod['Socket_13'] = utils.round_n(bb_radius * 0.05, 2)
+            elif settings.brushstroke_method == 'SURFACE_DRAW':
+                # set width
+                mod['Socket_5'] = utils.round_n(bb_radius * 0.05, 2)
+
         # refresh UI
         for mod in brushstrokes_object.modifiers:
             mod.node_group.interface_update(context)

scripts-blender/addons/brushstroke_tools/settings.py

@@ -231,6 +231,9 @@ class BSBST_Settings(bpy.types.PropertyGroup):
     edit_toggle: bpy.props.BoolProperty(default=True,
                                        name='Edit Active Brushstrokes',
                                        description="Jump into the corresponding edit mode when selecting/creating a brushstrokes layer")
+    estimate_dimensions: bpy.props.BoolProperty(default=True,
+                                       name='Estimate Dimensions',
+                                       description="Estimate the length, width and distribution density of the brush strokes based on the bounding box to provide a reasonable starting point regardless of scale")
 
 classes = [
     BSBST_socket_info,

scripts-blender/addons/brushstroke_tools/ui.py

@@ -187,6 +187,7 @@ class BSBST_PT_brushstroke_tools_panel(bpy.types.Panel):
             
             new_advanced_panel.prop(settings, 'assign_materials')
             new_advanced_panel.prop(settings, 'reuse_flow')
+            new_advanced_panel.prop(settings, 'estimate_dimensions')
             new_advanced_panel.prop(settings, 'style_context')
 
         # identify style context

scripts-blender/addons/brushstroke_tools/utils.py

@@ -1,6 +1,7 @@
 import os
 import bpy
 from bpy.app.handlers import persistent
+import math
 
 ng_list = [
     ".brushstroke_tools.processing",
@@ -281,6 +282,11 @@ def edit_active_brushstrokes(context):
         bpy.ops.wm.tool_set_by_id(name="brushstroke_tools.draw")
     return {'FINISHED'}
 
+def round_n(val, n):
+    """ Round value to n number of significant digits.
+    """
+    return round(val, n-int(math.floor(math.log10(abs(val))))-1)
+
 def register():
     bpy.app.handlers.depsgraph_update_post.append(refresh_preset)