user: Explain U in complete detail according to the official Blender documentation.

assistant: encilOpacityModifier.html#bpy.types.GreasePencilOpacityModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilOutlineModifier attribute)](bpy.types.GreasePencilOutlineModifier.html#bpy.types.GreasePencilOutlineModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilShrinkwrapModifier attribute)](bpy.types.GreasePencilShrinkwrapModifier.html#bpy.types.GreasePencilShrinkwrapModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilSimplifyModifier attribute)](bpy.types.GreasePencilSimplifyModifier.html#bpy.types.GreasePencilSimplifyModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilSmoothModifier attribute)](bpy.types.GreasePencilSmoothModifier.html#bpy.types.GreasePencilSmoothModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilSubdivModifier attribute)](bpy.types.GreasePencilSubdivModifier.html#bpy.types.GreasePencilSubdivModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilTextureModifier attribute)](bpy.types.GreasePencilTextureModifier.html#bpy.types.GreasePencilTextureModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilThickModifierData attribute)](bpy.types.GreasePencilThickModifierData.html#bpy.types.GreasePencilThickModifierData.use_layer_pass_filter)   - [(bpy.types.GreasePencilTimeModifier attribute)](bpy.types.GreasePencilTimeModifier.html#bpy.types.GreasePencilTimeModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilTintModifier attribute)](bpy.types.GreasePencilTintModifier.html#bpy.types.GreasePencilTintModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilWeightAngleModifier attribute)](bpy.types.GreasePencilWeightAngleModifier.html#bpy.types.GreasePencilWeightAngleModifier.use_layer_pass_filter)   - [(bpy.types.GreasePencilWeightProximityModifier attribute)](bpy.types.GreasePencilWeightProximityModifier.html#bpy.types.GreasePencilWeightProximityModifier.use_layer_pass_filter) - [use_legacy_behavior (bpy.types.LimitRotationConstraint attribute)](bpy.types.LimitRotationConstraint.html#bpy.types.LimitRotationConstraint.use_legacy_behavior) - [use_legacy_noise (bpy.types.FModifierNoise attribute)](bpy.types.FModifierNoise.html#bpy.types.FModifierNoise.use_legacy_noise) - [use_legacy_normal (bpy.types.GeometryNodeDistributePointsOnFaces attribute)](bpy.types.GeometryNodeDistributePointsOnFaces.html#bpy.types.GeometryNodeDistributePointsOnFaces.use_legacy_normal) - [use_length_interpolate (bpy.types.BrushCurvesSculptSettings attribute)](bpy.types.BrushCurvesSculptSettings.html#bpy.types.BrushCurvesSculptSettings.use_length_interpolate) - [use_length_max (bpy.types.FreestyleLineStyle attribute)](bpy.types.FreestyleLineStyle.html#bpy.types.FreestyleLineStyle.use_length_max) - [use_length_min (bpy.types.FreestyleLineStyle attribute)](bpy.types.FreestyleLineStyle.html#bpy.types.FreestyleLineStyle.use_length_min) - [use_library_path (bpy.types.PointCache attribute)](bpy.types.PointCache.html#bpy.types.PointCache.use_library_path)   - [(bpy.types.PointCacheItem attribute)](bpy.types.PointCacheItem.html#bpy.types.PointCacheItem.use_library_path) - [use_light_contour (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_light_contour) - [use_lights (bpy.types.GreasePencilLayer attribute)](bpy.types.GreasePencilLayer.html#bpy.types.GreasePencilLayer.use_lights) - [use_limit_ang_x (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_limit_ang_x) - [use_limit_ang_y (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_limit_ang_y) - [use_limit_ang_z (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_limit_ang_z) - [use_limit_lin_x (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_limit_lin_x) - [use_limit_lin_y (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_limit_lin_y) - [use_limit_lin_z (bpy.types.RigidBodyConstraint attribute)](bpy.types.RigidBodyConstraint.html#bpy.types.RigidBodyConstraint.use_limit_lin_z) - [use_limit_surface (bpy.types.SubsurfModifier attribute)](bpy.types.SubsurfModifier.html#bpy.types.SubsurfModifier.use_limit_surface) - [use_limit_x (bpy.types.LimitRotationConstraint attribute)](bpy.types.LimitRotationConstraint.html#bpy.types.LimitRotationConstraint.use_limit_x) - [use_limit_y (bpy.types.LimitRotationConstraint attribute)](bpy.types.LimitRotationConstraint.html#bpy.types.LimitRotationConstraint.use_limit_y) - [use_limit_z (bpy.types.LimitRotationConstraint attribute)](bpy.types.LimitRotationConstraint.html#bpy.types.LimitRotationConstraint.use_limit_z) - [use_line (bpy.types.BoidRuleFollowLeader attribute)](bpy.types.BoidRuleFollowLeader.html#bpy.types.BoidRuleFollowLeader.use_line)   - [(bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_line) - [use_linear_modifiers (bpy.types.Strip attribute)](bpy.types.Strip.html#bpy.types.Strip.use_linear_modifiers) - [use_lineart_intersection_priority (bpy.types.Collection attribute)](bpy.types.Collection.html#bpy.types.Collection.use_lineart_intersection_priority) - [use_live_edit (bpy.types.SpaceTextEditor attribute)](bpy.types.SpaceTextEditor.html#bpy.types.SpaceTextEditor.use_live_edit) - [use_live_unwrap (bpy.types.SpaceUVEditor attribute)](bpy.types.SpaceUVEditor.html#bpy.types.SpaceUVEditor.use_live_unwrap) - [use_load_ui (bpy.types.PreferencesFilePaths attribute)](bpy.types.PreferencesFilePaths.html#bpy.types.PreferencesFilePaths.use_load_ui) - [use_local_camera (bpy.types.SpaceView3D attribute)](bpy.types.SpaceView3D.html#bpy.types.SpaceView3D.use_local_camera) - [use_local_collections (bpy.types.SpaceView3D attribute)](bpy.types.SpaceView3D.html#bpy.types.SpaceView3D.use_local_collections) - [use_local_location (bpy.types.Bone attribute)](bpy.types.Bone.html#bpy.types.Bone.use_local_location)   - [(bpy.types.EditBone attribute)](bpy.types.EditBone.html#bpy.types.EditBone.use_local_location) - [use_location (bpy.types.KinematicConstraint attribute)](bpy.types.KinematicConstraint.html#bpy.types.KinematicConstraint.use_location) - [use_location_x (bpy.types.ChildOfConstraint attribute)](bpy.types.ChildOfConstraint.html#bpy.types.ChildOfConstraint.use_location_x) - [use_location_y (bpy.types.ChildOfConstraint attribute)](bpy.types.ChildOfConstraint.html#bpy.types.ChildOfConstraint.use_location_y) - [use_location_z (bpy.types.ChildOfConstraint attribute)](bpy.types.ChildOfConstraint.html#bpy.types.ChildOfConstraint.use_location_z) - [use_lock_interface (bpy.types.RenderSettings attribute)](bpy.types.RenderSettings.html#bpy.types.RenderSettings.use_lock_interface) - [use_lock_relative (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.use_lock_relative) - [use_locked_size (bpy.types.Brush attribute)](bpy.types.Brush.html#bpy.types.Brush.use_locked_size)   - [(bpy.types.UnifiedPaintSettings attribute)](bpy.types.UnifiedPaintSettings.html#bpy.types.UnifiedPaintSettings.use_locked_size) - [use_loop_data (bpy.types.DataTransferModifier attribute)](bpy.types.DataTransferModifier.html#bpy.types.DataTransferModifier.use_loop_data) - [use_loose (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_loose)   - [(bpy.types.MeshSkinVertex attribute)](bpy.types.MeshSkinVertex.html#bpy.types.MeshSkinVertex.use_loose) - [use_loose_as_contour (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_loose_as_contour) - [use_loose_edge_chain (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_loose_edge_chain) - [use_lores_mesh (bpy.types.BakeSettings attribute)](bpy.types.BakeSettings.html#bpy.types.BakeSettings.use_lores_mesh) - [use_lossless_output (bpy.types.FFmpegSettings attribute)](bpy.types.FFmpegSettings.html#bpy.types.FFmpegSettings.use_lossless_output) - [use_make_uniform (bpy.types.CopyScaleConstraint attribute)](bpy.types.CopyScaleConstraint.html#bpy.types.CopyScaleConstraint.use_make_uniform) - [use_manual_calibration (bpy.types.SpaceClipEditor attribute)](bpy.types.SpaceClipEditor.html#bpy.types.SpaceClipEditor.use_manual_calibration) - [use_map_alpha (bpy.types.LineStyleTextureSlot attribute)](bpy.types.LineStyleTextureSlot.html#bpy.types.LineStyleTextureSlot.use_map_alpha) - [use_map_clump (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_clump) - [use_map_color_diffuse (bpy.types.LineStyleTextureSlot attribute)](bpy.types.LineStyleTextureSlot.html#bpy.types.LineStyleTextureSlot.use_map_color_diffuse) - [use_map_damp (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_damp) - [use_map_density (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_density) - [use_map_field (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_field) - [use_map_gravity (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_gravity) - [use_map_kink_amp (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_kink_amp) - [use_map_kink_freq (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_kink_freq) - [use_map_length (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_length) - [use_map_life (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_life) - [use_map_rough (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_rough) - [use_map_size (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_size) - [use_map_taper (bpy.types.Curve attribute)](bpy.types.Curve.html#bpy.types.Curve.use_map_taper) - [use_map_time (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_time) - [use_map_twist (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_twist) - [use_map_velocity (bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.use_map_velocity) - [use_margin (bpy.types.RigidBodyObject attribute)](bpy.types.RigidBodyObject.html#bpy.types.RigidBodyObject.use_margin) - [use_marker_sync (bpy.types.SpaceDopeSheetEditor attribute)](bpy.types.SpaceDopeSheetEditor.html#bpy.types.SpaceDopeSheetEditor.use_marker_sync)   - [(bpy.types.SpaceSequenceEditor attribute)](bpy.types.SpaceSequenceEditor.html#bpy.types.SpaceSequenceEditor.use_marker_sync) - [use_mask (bpy.types.MovieTrackingTrack attribute)](bpy.types.MovieTrackingTrack.html#bpy.types.MovieTrackingTrack.use_mask) - [use_masks (bpy.types.GreasePencilTreeNode attribute)](bpy.types.GreasePencilTreeNode.html#bpy.types.GreasePencilTreeNode.use_masks) - [use_match_case (bpy.types.SpaceTextEditor attribute)](bpy.types.SpaceTextEditor.html#bpy.types.SpaceTextEditor.use_match_case) - [use_material (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_material) - [use_material_boundaries (bpy.types.FreestyleSettings attribute)](bpy.types.FreestyleSettings.html#bpy.types.FreestyleSettings.use_material_boundaries) - [use_material_mask (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_material_mask)   - [(bpy.types.MaterialLineArt attribute)](bpy.types.MaterialLineArt.html#bpy.types.MaterialLineArt.use_material_mask) - [use_material_mask_bits (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_material_mask_bits)   - [(bpy.types.MaterialLineArt attribute)](bpy.types.MaterialLineArt.html#bpy.types.MaterialLineArt.use_material_mask_bits) - [use_material_mask_match (bpy.types.GreasePencilLineartModifier attribute)](bpy.types.GreasePencilLineartModifier.html#bpy.types.GreasePencilLineartModifier.use_material_mask_match) - [use_material_pass_filter (bpy.types.GreasePencilArrayModifier attribute)](bpy.types.GreasePencilArrayModifier.html#bpy.types.GreasePencilArrayModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilBuildModifier attribute)](bpy.types.GreasePencilBuildModifier.html#bpy.types.GreasePencilBuildModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilColorModifier attribute)](bpy.types.GreasePencilColorModifier.html#bpy.types.GreasePencilColorModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilDashModifierData attribute)](bpy.types.GreasePencilDashModifierData.html#bpy.types.GreasePencilDashModifierData.use_material_pass_filter)   - [(bpy.types.GreasePencilEnvelopeModifier attribute)](bpy.types.GreasePencilEnvelopeModifier.html#bpy.types.GreasePencilEnvelopeModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilHookModifier attribute)](bpy.types.GreasePencilHookModifier.html#bpy.types.GreasePencilHookModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilLatticeModifier attribute)](bpy.types.GreasePencilLatticeModifier.html#bpy.types.GreasePencilLatticeModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilLengthModifier attribute)](bpy.types.GreasePencilLengthModifier.html#bpy.types.GreasePencilLengthModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilMirrorModifier attribute)](bpy.types.GreasePencilMirrorModifier.html#bpy.types.GreasePencilMirrorModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilMultiplyModifier attribute)](bpy.types.GreasePencilMultiplyModifier.html#bpy.types.GreasePencilMultiplyModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilNoiseModifier attribute)](bpy.types.GreasePencilNoiseModifier.html#bpy.types.GreasePencilNoiseModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilOffsetModifier attribute)](bpy.types.GreasePencilOffsetModifier.html#bpy.types.GreasePencilOffsetModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilOpacityModifier attribute)](bpy.types.GreasePencilOpacityModifier.html#bpy.types.GreasePencilOpacityModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilOutlineModifier attribute)](bpy.types.GreasePencilOutlineModifier.html#bpy.types.GreasePencilOutlineModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilShrinkwrapModifier attribute)](bpy.types.GreasePencilShrinkwrapModifier.html#bpy.types.GreasePencilShrinkwrapModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilSimplifyModifier attribute)](bpy.types.GreasePencilSimplifyModifier.html#bpy.types.GreasePencilSimplifyModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilSmoothModifier attribute)](bpy.types.GreasePencilSmoothModifier.html#bpy.types.GreasePencilSmoothModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilSubdivModifier attribute)](bpy.types.GreasePencilSubdivModifier.html#bpy.types.GreasePencilSubdivModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilTextureModifier attribute)](bpy.types.GreasePencilTextureModifier.html#bpy.types.GreasePencilTextureModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilThickModifierData attribute)](bpy.types.GreasePencilThickModifierData.html#bpy.types.GreasePencilThickModifierData.use_material_pass_filter)   - [(bpy.types.GreasePencilTintModifier attribute)](bpy.types.GreasePencilTintModifier.html#bpy.types.GreasePencilTintModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilWeightAngleModifier attribute)](bpy.types.GreasePencilWeightAngleModifier.html#bpy.types.GreasePencilWeightAngleModifier.use_material_pass_filter)   - [(bpy.types.GreasePencilWeightProximityModifier attribute)](bpy.types.GreasePencilWeightProximityModifier.html#bpy.types.GreasePencilWeightProximityModifier.use_material_pass_filter) - [use_material_pin (bpy.types.BrushGpencilSettings attribute)](bpy.types.BrushGpencilSettings.html#bpy.types.BrushGpencilSettings.use_material_pin) - [use_max (bpy.types.TexMapping attribute)](bpy.types.TexMapping.html#bpy.types.TexMapping.use_max) - [use_max_b_frames (bpy.types.FFmpegSettings attribute)](bpy.types.FFmpegSettings.html#bpy.types.FFmpegSettings.use_max_b_frames) - [use_max_distance (bpy.types.DataTransferModifier attribute)](bpy.types.DataTransferModifier.html#bpy.types.DataTransferModifier.use_max_distance)   - [(bpy.types.FieldSettings attribute)](bpy.types.FieldSettings.html#bpy.types.FieldSettings.use_max_distance) - [use_max_x (bpy.types.FModifierLimits attribute)](bpy.types.FModifierLimits.html#bpy.types.FModifierLimits.use_max_x)   - [(bpy.types.LimitLocationConstraint attribute)](bpy.types.LimitLocationConstraint.html#bpy.types.LimitLocationConstraint.use_max_x)   - [(bpy.types.LimitScaleConstraint attribute)](bpy.types.LimitScaleConstraint.html#bpy.types.LimitScaleConstraint.use_max_x) - [use_max_y (bpy.types.FModifierLimits attribute)](bpy.types.FModifierLimits.html#bpy.types.FModif