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Blender Vertex Face Brush [tested in 3.6]
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| # | |
| # Add a tool to vertex paint mode that paints by FACE | |
| # | |
| import bpy | |
| import bmesh | |
| from mathutils import Vector | |
| from bpy.types import WorkSpaceTool | |
| from bl_ui.space_toolsystem_common import ToolDef | |
| from bpy_extras import view3d_utils | |
| class CustomVertexPaintTool(WorkSpaceTool): | |
| bl_space_type = 'VIEW_3D' | |
| bl_context_mode = 'PAINT_VERTEX' | |
| bl_idname = "vertex_face_paint.tool" | |
| bl_label = "Vertex Face Paint Tool" | |
| bl_description = "A vertex painting tool that works on mesh faces" | |
| #bl_icon = "brush.paint_vertex.replace" | |
| #bl_icon = "brush.gpencil_draw.draw" | |
| bl_icon = "brush.sculpt.paint" | |
| bl_widget = None | |
| bl_keymap = ( | |
| ("vertex_face_paint.operator", {"type": 'LEFTMOUSE', "value": 'PRESS'}, None), | |
| ) | |
| def draw_settings(context, layout, tool): | |
| props = tool.operator_properties("vertex_face_paint.operator") | |
| # TODO Use the builtin vertex paint tool props | |
| layout.prop(props, "brush_color") | |
| layout.prop(props, "brush_alpha") | |
| layout.prop(props, "apply_alpha") | |
| class CustomVertexPaintOperator(bpy.types.Operator): | |
| bl_idname = "vertex_face_paint.operator" | |
| bl_label = "Vertex Face Paint Operator" | |
| bl_options = {'REGISTER', 'UNDO'} | |
| brush_color: bpy.props.FloatVectorProperty( | |
| name="Brush Color", | |
| subtype='COLOR', | |
| default=(1.0, 0.0, 0.0), | |
| min=0.0, | |
| max=1.0 | |
| ) | |
| brush_alpha: bpy.props.FloatProperty( | |
| name="Alpha", | |
| default=(1.0), | |
| min=0.0, | |
| max=1.0 | |
| ) | |
| apply_alpha: bpy.props.BoolProperty( | |
| name="Apply Alpha", | |
| default=False, | |
| ) | |
| _did_paint = False | |
| def modal(self, context, event): | |
| if event.type == 'MOUSEMOVE': | |
| self._did_paint = True | |
| self.paint(context, event) | |
| elif event.type == 'LEFTMOUSE': | |
| if event.value == 'RELEASE': | |
| if self._did_paint: | |
| self._did_paint = False | |
| else: | |
| # ensure paint on single click | |
| self.paint(context, event) | |
| return {'FINISHED'} | |
| elif event.type in {'RIGHTMOUSE', 'ESC'}: | |
| self._did_paint = False | |
| return {'CANCELLED'} | |
| return {'RUNNING_MODAL'} | |
| def invoke(self, context, event): | |
| # TODO: is this inline with default behaviour? | |
| if context.object.data.vertex_colors.active is None: | |
| self.report({'WARNING'}, "No vertex color attribute layer") | |
| return {'CANCELLED'} | |
| if context.object and context.object.type == 'MESH': | |
| context.window.cursor_set('PAINT_BRUSH') | |
| context.window_manager.modal_handler_add(self) | |
| return {'RUNNING_MODAL'} | |
| else: | |
| self.report({'WARNING'}, "No active mesh object") | |
| return {'CANCELLED'} | |
| def paint(self, context, event): | |
| obj = context.object | |
| vertex_color_layer = obj.data.vertex_colors.active | |
| # Get the ray from the viewport and mouse | |
| region = context.region | |
| rv3d = context.region_data | |
| coord = event.mouse_region_x, event.mouse_region_y | |
| view_vector = view3d_utils.region_2d_to_vector_3d(region, rv3d, coord) | |
| ray_origin = view3d_utils.region_2d_to_origin_3d(region, rv3d, coord) | |
| # Cast the ray | |
| hit, location, normal, face_index, object, matrix = context.scene.ray_cast(context.view_layer.depsgraph, ray_origin, view_vector) | |
| if hit: | |
| face = obj.data.polygons[face_index] | |
| for loop_index in face.loop_indices: | |
| alpha = self.brush_alpha | |
| if not self.apply_alpha: | |
| alpha = Vector(vertex_color_layer.data[loop_index].color).w | |
| new_color = Vector((self.brush_color.r, self.brush_color.g, self.brush_color.b, alpha)) | |
| vertex_color_layer.data[loop_index].color = new_color | |
| # Update mesh | |
| obj.data.update() | |
| def register(): | |
| bpy.utils.register_class(CustomVertexPaintOperator) | |
| bpy.utils.register_tool(CustomVertexPaintTool, separator=True, group=True) | |
| def unregister(): | |
| bpy.utils.unregister_class(CustomVertexPaintOperator) | |
| bpy.utils.unregister_tool(CustomVertexPaintTool) | |
| if __name__ == "__main__": | |
| register() |
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