Add Eraser Tool

1.5.0
- feat: Eraser Brush Tool (Need to be enable in the preferences)

OP_eraser_brush.py

@@ -0,0 +1,467 @@
+import bpy
+from bpy.types import Operator
+import bgl
+from gpu_extras.presets import draw_circle_2d
+from time import time
+from mathutils import Vector, Matrix, Euler
+from mathutils.kdtree import KDTree
+from mathutils.geometry import intersect_line_plane, intersect_line_sphere_2d, intersect_line_line
+from bpy_extras.view3d_utils import region_2d_to_location_3d, region_2d_to_vector_3d, \
+location_3d_to_region_2d, region_2d_to_origin_3d, region_2d_to_location_3d
+from time import time
+
+
+def get_gp_mat(gp, name, set_active=False):
+    mat = bpy.data.materials.get(name)
+    if not mat:
+        mat = bpy.data.materials.new(name)
+        bpy.data.materials.create_gpencil_data(mat)
+        
+    if mat not in gp.data.materials[:]:
+        gp.data.materials.append(mat)
+    mat_index = gp.data.materials[:].index(mat)
+    
+    if set_active:
+        gp.active_material_index = mat_index
+
+    return mat
+
+def get_gp_frame(gp_layer, frame=None):
+    if frame is None:
+        frame = bpy.context.scene.frame_current
+    gp_frame = next((f for f in gp_layer.frames if f.frame_number==frame), None)
+    if not gp_frame:
+        gp_frame = gp_layer.frames.new(frame)
+    
+    return gp_frame
+
+def get_gp_layer(gp, name=None):
+    if not name:
+        return gp.data.layers.active
+    
+    layer = gp.data.layers.get(name)
+    if not layer:
+        layer = gp.data.layers.new(name)
+        
+    gp.data.layers.active = layer
+
+    return layer
+
+def co_2d_to_3d(co, depth=0.1):
+    area = bpy.context.area
+    region = bpy.context.region
+    rv3d = area.spaces.active.region_3d
+    view_mat = rv3d.view_matrix.inverted()
+    org = view_mat.to_translation()
+    
+    depth_3d = view_mat @ Vector((0, 0, -depth))
+    #org = region_2d_to_origin_3d(region, rv3d, (region.width/2.0, region.height/2.0))
+        
+    return region_2d_to_location_3d(region, rv3d, co, depth_3d)
+
+
+    #vec = (region_2d_to_origin_3d(region, rv3d, co) - org).normalized()
+
+    return org + vec
+
+    return org + region_2d_to_vector_3d(region, rv3d , co)
+
+def get_cuts_data(strokes, mouse, radius):
+    gp = bpy.context.object
+    
+    area = bpy.context.area
+    region = bpy.context.region
+    rv3d = area.spaces.active.region_3d
+    view_mat = rv3d.view_matrix.inverted()
+    org = view_mat.to_translation()    
+    mat = gp.matrix_world
+    
+    cuts_data = []
+    for s in strokes:
+        is_polyline = 2<=len(s.points)<=5
+        
+        if not is_polyline and not s.select:
+            continue
+        
+        for i, p in enumerate(s.points):
+            
+            if not p.select and not is_polyline:
+                continue
+                # Test if the next or previous is unselected
+                
+            edges = []
+            
+            if i > 0:
+                prev_p = s.points[i-1]
+                if not prev_p.select and not is_polyline:
+                    edges.append((i-1, i))
+            
+            if i < len(s.points)-1:
+                next_p = s.points[i+1]
+                if not next_p.select or is_polyline:
+                    edges.append((i, i+1))
+                        
+            for p1_index, p2_index in edges:
+                p1 = s.points[p1_index]
+                p2 = s.points[p2_index]
+                
+                length_3d = (p2.co-p1.co).length
+                
+                p1_3d = mat @ p1.co
+                p2_3d = mat @ p2.co
+                
+                p1_2d = location_3d_to_region_2d(region, rv3d, p1_3d)
+                p2_2d = location_3d_to_region_2d(region, rv3d, p2_3d)
+                
+                if p1_2d is None or p2_2d is None:
+                    continue
+                
+                length_2d = (p2_2d-p1_2d).length
+                
+                if length_2d <= 4:
+                    continue
+                
+                intersects = intersect_line_sphere_2d(p1_2d, p2_2d, mouse, radius+2)
+                intersects = [i for i in intersects if i is not None]
+                if not intersects:
+                    continue
+                
+                close_points = [(p1_2d-i).length < 1 or (p2_2d-i).length < 1 for i in intersects]
+                if any(close_points):
+                    #print('close_points', close_points)
+                    continue
+                    
+                
+                line_intersects = []
+                for i_2d in intersects:                            
+                    #factor = ((i_2d-p1_2d).length) / length_2d
+                    #factor_3d = factor_2d * length_3d
+                    #vec = region_2d_to_vector_3d(region, rv3d, i_2d)
+                    p3_3d = region_2d_to_location_3d(region, rv3d, i_2d, org)
+                    p4_3d = region_2d_to_origin_3d(region, rv3d, i_2d)
+                    
+                    #bpy.context.scene.cursor.location = p3_3d
+                    
+                    line_intersect = intersect_line_line(p1_3d, p2_3d, p3_3d, p4_3d)
+                    if not line_intersect:
+                        continue
+                        
+                    
+                    i1_3d, _ = line_intersect
+                    
+                    line_intersects += [i1_3d]
+                    
+                    #context.scene.cursor.location = i1_3d
+                
+                if line_intersects:
+                    line_intersects.sort(key=lambda x : (x-p1_3d).length)
+                    #cut_data[-1].sort(key=lambda x : (x-p1_3d).length)
+                    cut_data = [p1_index, p2_index, s, line_intersects]
+                    cuts_data.append(cut_data)
+        
+    return cuts_data
+
+class GPTB_OT_eraser(Operator):
+    """Draw a line with the mouse"""
+    bl_idname = "gp.eraser"
+    bl_label = "Eraser Brush"
+    bl_options = {'REGISTER', 'UNDO'}
+
+    def draw_callback_px(self):
+        bgl.glEnable(bgl.GL_BLEND)
+        draw_circle_2d(self.mouse, (0.75, 0.25, 0.35, 0.85), self.radius, 32)
+        bgl.glDisable(bgl.GL_BLEND)
+
+    def draw_holdout(self, context, event):
+        gp = context.object
+        mat_inv = gp.matrix_world.inverted()
+        mouse_3d = co_2d_to_3d(self.mouse)
+        radius_3d = co_2d_to_3d(self.mouse + Vector((self.radius, 0)))
+        search_radius = (radius_3d-mouse_3d).length
+        
+        #print('search_radius', search_radius)
+        #print('radius', self.radius)
+        
+        #bpy.context.scene.cursor.location = mouse_3d
+        
+        for gp_frame, hld_stroke in self.hld_strokes:
+            #print('Add Point')
+            
+            hld_stroke.points.add(count=1)
+            p =  hld_stroke.points[-1]
+            p.co = mat_inv @ mouse_3d
+            p.pressure = search_radius * 2000
+            
+            #context.scene.cursor.location = mouse_3d
+            
+    def get_radius(self, context, event):
+        pressure = event.pressure or 1
+        return context.scene.gptoolprops.eraser_radius * pressure
+            
+
+        
+        
+    def erase(self, context, event):
+        gp = context.object
+        mat_inv = gp.matrix_world.inverted()
+            
+        new_points = []
+        
+        #print(self.cuts_data)
+        
+        for f in self.gp_frames:
+            for s in [s for s in f.strokes if s.material_index==self.hld_index]:
+                f.strokes.remove(s)
+        
+        gp.data.materials.pop(index=self.hld_index)
+        bpy.data.materials.remove(self.hld_mat)  
+        
+        
+        bpy.ops.object.mode_set(mode='EDIT_GPENCIL')
+        context.scene.tool_settings.gpencil_selectmode_edit = 'POINT'
+        #context.scene.tool_settings.gpencil_selectmode_edit = 'POINT'
+
+        #bpy.ops.gpencil.select_circle(x=x, y=y, radius=radius, wait_for_input=False)
+        
+        #for cut_data in self.cuts_data:
+            
+        #    print(cut_data, len(cut_data))
+        t0 = time()
+        print()
+        
+        print('Number of cuts', len(self.mouse_path))
+        
+        for mouse in self.mouse_path:
+            t1 = time()
+            
+            print()
+            x, y = mouse
+            bpy.ops.gpencil.select_all(action='DESELECT')
+            bpy.ops.gpencil.select_circle(x=x, y=y, radius=self.radius, wait_for_input=False)
+            
+            strokes = [s for f in self.gp_frames for s in f.strokes]
+            print('select_circle', time()-t1)
+            
+            t2 = time()
+            cut_data = get_cuts_data(strokes, mouse, self.radius)
+            print('get_cuts_data', time()-t2)
+            
+            t3 = time()
+            for p1_index, p2_index, stroke, intersects in cut_data[::-1]:
+                bpy.ops.gpencil.select_all(action='DESELECT')
+                
+                #print('p1_index', p1_index)
+                #print('p2_index', p2_index)
+                
+                p1 = stroke.points[p1_index]
+                p2 = stroke.points[p2_index]
+                
+                p1.select = True
+                p2.select = True
+                
+                number_cuts = len(intersects)            
+                
+                bpy.ops.gpencil.stroke_subdivide(number_cuts=number_cuts, only_selected=True)
+                
+                
+                new_p1 = stroke.points[p1_index+1]
+                new_p1.co = mat_inv@intersects[0]
+                new_points += [(stroke, p1_index+1)]
+                
+                #print('number_cuts', number_cuts)
+                    
+                if number_cuts == 2:
+                    new_p2 = stroke.points[p1_index+2]
+                    new_p2.co = mat_inv@( (intersects[0] + intersects[1])/2 )
+                    #new_points += [new_p2]
+                
+                    new_p3 = stroke.points[p1_index+3]
+                    new_p3.co = mat_inv@intersects[1]
+                    new_points += [(stroke, p1_index+3)]  
+                        
+            print('subdivide', time() - t3)
+            
+            bpy.ops.gpencil.select_circle(x=x, y=y, radius=self.radius-2, wait_for_input=False)
+            
+            '''
+            selected_strokes = [s for f in self.gp_frames for s in f.strokes if s.select]
+            tip_points = [p for s in selected_strokes for i, p in enumerate(s.points) if p.select and (i==0 or i == len(s.points)-1)]
+            
+            bpy.ops.gpencil.select_less()
+            
+            for p in tip_points:
+                p.select = True
+            for stroke, index in new_points:
+                stroke.points[index].select = False
+                '''
+            
+            t4 = time()
+            selected_strokes = [s for f in self.gp_frames for s in f.strokes if s.select] 
+
+            if selected_strokes:
+                bpy.ops.gpencil.delete(type='POINTS')
+                
+            print('remove points', time()- t4)
+            
+            
+            print('Total one cut', time()-t1)
+            
+        print('Total all cuts', time()-t0)
+        #bpy.ops.gpencil.select_less()
+        #for stroke, index in new_points:
+        #    stroke.points[index].select = False
+        
+        #bpy.ops.object.mode_set(mode='OBJECT')
+        bpy.ops.object.mode_set(mode='PAINT_GPENCIL')   
+        #selected_strokes = [s for s in self.gp_frame.strokes if s.select]   
+        #bpy.ops.object.mode_set(mode='PAINT_GPENCIL')
+                
+    def modal(self, context, event):    
+        mouse = Vector((event.mouse_region_x, event.mouse_region_y))
+        
+        self.radius = self.get_radius(context, event)
+        context.area.tag_redraw()
+        
+        if event.type == 'LEFTMOUSE':
+            #self.mouse = mouse
+            self.mouse_path.append(self.mouse)
+            self.erase(context, event)
+            bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
+            return {'FINISHED'}
+        
+        if (mouse-self.mouse).length < min(self.radius, 2):
+            return {'RUNNING_MODAL'}    
+        
+        self.mouse = mouse
+        
+        if event.type in {'MOUSEMOVE', 'INBETWEEN_MOUSEMOVE'}:
+            self.draw_holdout(context, event)
+            self.mouse_path.append(self.mouse)
+            #self.update_cuts_data(context, event)
+            #self.erase(context, event)
+            return {'RUNNING_MODAL'} 
+
+        elif event.type in {'RIGHTMOUSE', 'ESC'}:
+            bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
+            return {'CANCELLED'}
+        
+        return {'RUNNING_MODAL'}
+
+    def invoke(self, context, event):
+        gp = context.object
+        matrix = gp.matrix_world
+        
+        self.mouse = Vector((event.mouse_region_x, event.mouse_region_y))
+        self.mouse_path = [self.mouse]
+        
+        area = context.area
+        region = context.region
+        w, h =  region.width, region.height
+        
+        rv3d = area.spaces.active.region_3d
+        view_mat = rv3d.view_matrix.inverted()
+        org = self.org = view_mat.to_translation()
+        
+        #org = region_2d_to_origin_3d(region, rv3d, (region.width/2.0, region.height/2.0))
+        
+        
+        #print('ORG', org)
+        #print('view_mat', view_mat)
+        
+        self.radius = self.get_radius(context, event)
+        self.cuts_data = []
+        
+        #org = self.view_mat @ Vector((0, 0, -10))
+        #self.plane_no = self.plane_co-self.org
+        
+        #bottom_left = region_2d_to_location_3d(region, rv3d , (0, 0), self.plane_co)
+        #bottom_right = region_2d_to_location_3d(region, rv3d , (0, w), self.plane_co)
+        
+        #bottom_left = intersect_line_plane(self.org, bottom_left, self.plane_co, self.plane_no)
+        #bottom_right = intersect_line_plane(self.org, bottom_right, self.plane_co, self.plane_no)
+        
+        #self.scale_fac = (bottom_right-bottom_left).length / w
+        
+        #print('scale_fac', self.scale_fac)
+        #depth_location = view_mat @ Vector((0, 0, -1))
+        #context.scene.cursor.location = depth_location
+        
+        #plane_2d = [(0, 0), (0, h), (w, h), (w, h)]
+        #plane_3d = [region_2d_to_location_3d(p)]
+        
+        
+        t0 = time()
+        gp_mats = gp.data.materials
+        gp_layers = [l for l in gp.data.layers if not l.lock or l.hide]
+        self.gp_frames = [l.active_frame for l in gp_layers]
+        '''
+        points_data = [(s, f, gp_mats[s.material_index]) for f in gp_frames for s in f.strokes]
+        points_data = [(s, f, m) for s, f, m in points_data if not m.grease_pencil.hide or m.grease_pencil.lock]
+        print('get_gp_points', time()-t0)
+        
+        t0 = time()
+        #points_data = [(s, f, m, p, get_screen_co(p.co, matrix)) for s, f, m in points_data for p in reversed(s.points)]
+        points_data = [(s, f, m, p, org + ((matrix @ p.co)-org).normalized()*1) for s, f, m in points_data for p in reversed(s.points)]
+        print('points_to_2d', time()-t0)
+        
+        #print(points_data)
+        self.points_data = [(s, f, m, p, co) for s, f, m, p, co in points_data if co is not None]   
+        
+        #for s, f, m, p, co in self.points_data:
+        #    p.co = co
+        
+        
+        t0 = time()
+        self.kd_tree = KDTree(len(self.points_data))
+        for i, point_data in enumerate(self.points_data):
+            s, f, m, p, co = point_data
+            self.kd_tree.insert(co, i)
+        
+        self.kd_tree.balance()
+        print('create kdtree', time()-t0)
+        '''
+        
+        # Create holdout mat
+        self.hld_mat = get_gp_mat(gp, name='Eraser Holdout Stroke')
+        self.hld_mat.grease_pencil.use_stroke_holdout = True
+        self.hld_mat.grease_pencil.show_stroke = True
+        self.hld_mat.grease_pencil.show_fill = False
+        self.hld_mat.grease_pencil.use_overlap_strokes = True
+
+        self.hld_index = gp_mats[:].index(self.hld_mat)
+        
+        self.hld_strokes = []
+        for f in self.gp_frames:
+            hld_stroke = f.strokes.new()
+            hld_stroke.start_cap_mode = 'ROUND'
+            hld_stroke.end_cap_mode = 'ROUND'
+            hld_stroke.material_index = self.hld_index
+            
+            #hld_stroke.line_width = self.radius
+            
+            self.hld_strokes.append((f, hld_stroke))
+                          
+        self.draw_holdout(context, event)
+        
+        
+        
+        context.area.tag_redraw()
+        self._handle = bpy.types.SpaceView3D.draw_handler_add(self.draw_callback_px, (), 'WINDOW', 'POST_PIXEL')
+
+        context.window_manager.modal_handler_add(self)
+                    
+        return {'RUNNING_MODAL'}
+
+### --- REGISTER ---
+
+classes=(
+GPTB_OT_eraser,
+)
+
+def register():
+    for cls in classes:
+        bpy.utils.register_class(cls)
+
+def unregister():
+    for cls in reversed(classes):
+        bpy.utils.unregister_class(cls)

TOOL_eraser_brush.py

@@ -0,0 +1,68 @@
+import bpy
+from bpy.types import WorkSpaceTool
+from gpu_extras.presets import draw_circle_2d
+from time import time
+from .utils import get_addon_prefs
+
+
+class GPTB_WT_eraser(WorkSpaceTool):
+    bl_space_type = 'VIEW_3D'
+    bl_context_mode = 'PAINT_GPENCIL'
+
+    # The prefix of the idname should be your add-on name.
+    bl_idname = "gp.eraser_tool"
+    bl_label = "Eraser"
+    bl_description = (
+        "This is a tooltip\n"
+        "with multiple lines"
+    )
+    bl_icon = "brush.paint_vertex.draw"
+    bl_widget = None
+    bl_keymap = (
+        ("gp.eraser", {"type": 'LEFTMOUSE', "value": 'PRESS'},
+         {"properties": []}),
+        ("wm.radial_control", {"type": 'F', "value": 'PRESS'},
+         {"properties": [("data_path_primary", 'scene.gptoolprops.eraser_radius')]}),
+    )
+    
+    bl_cursor = 'DOT'
+    
+    '''
+    def draw_cursor(context, tool, xy):
+        from gpu_extras.presets import draw_circle_2d
+
+        radius = context.scene.gptoolprops.eraser_radius
+        draw_circle_2d(xy, (0.75, 0.25, 0.35, 0.85), radius, 32)
+    '''
+        
+    def draw_settings(context, layout, tool):
+        layout.prop(context.scene.gptoolprops, "eraser_radius")
+
+### --- REGISTER ---
+
+## --- KEYMAP
+addon_keymaps = []
+def register_keymaps():
+    addon = bpy.context.window_manager.keyconfigs.addon
+
+    km = addon.keymaps.new(name="Grease Pencil Stroke Paint (Draw brush)", space_type="EMPTY", region_type='WINDOW')
+    kmi = km.keymap_items.new("gp.eraser", type='LEFTMOUSE', value="PRESS", ctrl=True)
+
+    prefs = get_addon_prefs()
+    kmi.active = prefs.use_precise_eraser
+    addon_keymaps.append((km, kmi))
+
+def unregister_keymaps():
+    for km, kmi in addon_keymaps:
+        km.keymap_items.remove(kmi)
+    addon_keymaps.clear()
+
+def register():
+    bpy.utils.register_tool(GPTB_WT_eraser, after={"builtin.cursor"})
+    #bpy.context.window_manager.keyconfigs.default.keymaps['Grease Pencil Stroke Paint (Draw brush)'].keymap_items[3].idname = 'gp.eraser'
+
+    register_keymaps()
+
+def unregister():
+    bpy.utils.unregister_tool(GPTB_WT_eraser)
+    unregister_keymaps()

__init__.py

@@ -14,8 +14,8 @@
 bl_info = {
 "name": "GP toolbox",
 "description": "Set of tools for Grease Pencil in animation production",
-"author": "Samuel Bernou",
+"author": "Samuel Bernou, Christophe Seux",
-"version": (1, 4, 3),
+"version": (1, 5, 0),
 "blender": (2, 91, 0),
 "location": "Sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",
@@ -48,6 +48,8 @@ from . import OP_copy_paste
 from . import OP_realign
 from . import OP_depth_move
 from . import OP_key_duplicate_send
+from . import OP_eraser_brush
+from . import TOOL_eraser_brush
 from . import handler_draw_cam
 from . import keymaps
 
@@ -97,9 +99,23 @@ def remap_on_save_update(self, context):
         if 'remap_relative' in [hand.__name__ for hand in bpy.app.handlers.save_pre]:
             bpy.app.handlers.save_pre.remove(remap_relative)
 
+
+
+def update_use_precise_eraser(self, context):
+    
+    km, kmi = TOOL_eraser_brush.addon_keymaps[0]
+
+    kmi.active = self.use_precise_eraser
+
+
 class GPTB_prefs(bpy.types.AddonPreferences):
     bl_idname = __name__
     
+    use_precise_eraser : BoolProperty(
+        name='Precise Eraser',
+        default=False,
+        update=update_use_precise_eraser
+    )
     ## tabs
     
     pref_tabs : EnumProperty(
@@ -335,7 +351,7 @@ class GPTB_prefs(bpy.types.AddonPreferences):
             
             # box.separator()## Keyframe jumper
             box = layout.box()
-            box.label(text='Keyframe Jump option:')
+            box.label(text='Keyframe Jump options:')
 
             box.prop(self, "kfj_use_shortcut", text='Bind shortcuts')
             if self.kfj_use_shortcut:
@@ -381,6 +397,9 @@ class GPTB_prefs(bpy.types.AddonPreferences):
             box.label(text='Random color options:')
             box.prop(self, 'separator')
             
+            box = layout.box()
+            box.label(text='Tools options:')
+            box.prop(self, 'use_precise_eraser')
             
         if self.pref_tabs == 'MAN_OPS':
             # layout.separator()## notes 
@@ -457,6 +476,8 @@ def register():
     OP_realign.register()
     OP_depth_move.register()
     OP_key_duplicate_send.register()
+    OP_eraser_brush.register()
+    TOOL_eraser_brush.register()
     handler_draw_cam.register()
     UI_tools.register()
     keymaps.register()
@@ -480,6 +501,8 @@ def unregister():
         bpy.utils.unregister_class(cls)
     UI_tools.unregister()
     handler_draw_cam.unregister()
+    OP_eraser_brush.unregister()
+    TOOL_eraser_brush.unregister()
     OP_key_duplicate_send.unregister()
     OP_depth_move.unregister()
     OP_realign.unregister()

properties.py

@@ -9,12 +9,16 @@ from bpy.props import (
 
 from .OP_cursor_snap_canvas import cursor_follow_update
 
+
 def change_edit_lines_opacity(self, context):
     for gp in bpy.data.grease_pencils:
         if not gp.is_annotation:
             gp.edit_line_color[3]=self.edit_lines_opacity
 
 class GP_PG_ToolsSettings(bpy.types.PropertyGroup) :
+    eraser_radius : IntProperty(
+        name="Tint hue offset", description="Radius of eraser brush", 
+        default=20, min=0, max=500, subtype='PIXEL')
 
     drawcam_passepartout : BoolProperty(
         name="Show cam passepartout",