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

assistant: ifier.html#bpy.types.CastModifier.use_z)   - [(bpy.types.CopyLocationConstraint attribute)](bpy.types.CopyLocationConstraint.html#bpy.types.CopyLocationConstraint.use_z)   - [(bpy.types.CopyRotationConstraint attribute)](bpy.types.CopyRotationConstraint.html#bpy.types.CopyRotationConstraint.use_z)   - [(bpy.types.CopyScaleConstraint attribute)](bpy.types.CopyScaleConstraint.html#bpy.types.CopyScaleConstraint.use_z)   - [(bpy.types.LaplacianSmoothModifier attribute)](bpy.types.LaplacianSmoothModifier.html#bpy.types.LaplacianSmoothModifier.use_z)   - [(bpy.types.SmoothModifier attribute)](bpy.types.SmoothModifier.html#bpy.types.SmoothModifier.use_z) - [use_z_symmetry (bpy.types.SkinModifier attribute)](bpy.types.SkinModifier.html#bpy.types.SkinModifier.use_z_symmetry) - [use_zbuffer (bpy.types.CompositorNodeDefocus attribute)](bpy.types.CompositorNodeDefocus.html#bpy.types.CompositorNodeDefocus.use_zbuffer) - [use_zoom_to_fit (bpy.types.SpaceSequenceEditor attribute)](bpy.types.SpaceSequenceEditor.html#bpy.types.SpaceSequenceEditor.use_zoom_to_fit) - [use_zoom_to_mouse (bpy.types.PreferencesInput attribute)](bpy.types.PreferencesInput.html#bpy.types.PreferencesInput.use_zoom_to_mouse) - [user_clear() (bpy.types.ID method)](bpy.types.ID.html#bpy.types.ID.user_clear) - [user_map() (bpy.types.BlendData method)](bpy.types.BlendData.html#bpy.types.BlendData.user_map) - [user_of_id() (bpy.types.ID method)](bpy.types.ID.html#bpy.types.ID.user_of_id) - [user_remap() (bpy.types.ID method)](bpy.types.ID.html#bpy.types.ID.user_remap) - [user_resource() (in module bpy.utils)](bpy.utils.html#bpy.utils.user_resource) - [user_transforms_clear() (in module bpy.ops.pose)](bpy.ops.pose.html#bpy.ops.pose.user_transforms_clear) - [UserAssetLibrary (class in bpy.types)](bpy.types.UserAssetLibrary.html#bpy.types.UserAssetLibrary) - [UserExtensionRepo (class in bpy.types)](bpy.types.UserExtensionRepo.html#bpy.types.UserExtensionRepo) - [UserExtensionRepo.directory (in module bpy.types)](bpy.types.UserExtensionRepo.html#bpy.types.UserExtensionRepo.directory) - [UserExtensionRepoCollection (class in bpy.types)](bpy.types.UserExtensionRepoCollection.html#bpy.types.UserExtensionRepoCollection) - [userjit (bpy.types.ParticleSettings attribute)](bpy.types.ParticleSettings.html#bpy.types.ParticleSettings.userjit) - [userpref_allow_online() (in module bpy.ops.extensions)](bpy.ops.extensions.html#bpy.ops.extensions.userpref_allow_online) - [userpref_allow_online_popup() (in module bpy.ops.extensions)](bpy.ops.extensions.html#bpy.ops.extensions.userpref_allow_online_popup) - [userpref_show() (in module bpy.ops.screen)](bpy.ops.screen.html#bpy.ops.screen.userpref_show) - [userpref_show_for_update() (in module bpy.ops.extensions)](bpy.ops.extensions.html#bpy.ops.extensions.userpref_show_for_update) - [userpref_show_online() (in module bpy.ops.extensions)](bpy.ops.extensions.html#bpy.ops.extensions.userpref_show_online) - [userpref_tags_set() (in module bpy.ops.extensions)](bpy.ops.extensions.html#bpy.ops.extensions.userpref_tags_set) - [USERPREF_UL_asset_libraries (class in bpy.types)](bpy.types.USERPREF_UL_asset_libraries.html#bpy.types.USERPREF_UL_asset_libraries) - [USERPREF_UL_extension_repos (class in bpy.types)](bpy.types.USERPREF_UL_extension_repos.html#bpy.types.USERPREF_UL_extension_repos) - [users() (bpy.types.ActionSlot method)](bpy.types.ActionSlot.html#bpy.types.ActionSlot.users) - [UserSolidLight (class in bpy.types)](bpy.types.UserSolidLight.html#bpy.types.UserSolidLight) - [uv (bmesh.types.bmesh.types.BMLayerAccessLoop attribute)](bmesh.types.html#bmesh.types.bmesh.types.BMLayerAccessLoop.uv)   - [(bmesh.types.bmesh.types.BMLoopUV attribute)](bmesh.types.html#bmesh.types.bmesh.types.BMLoopUV.uv)   - [(bpy.types.MeshUVLoop attribute)](bpy.types.MeshUVLoop.html#bpy.types.MeshUVLoop.uv) - [uv_face_opacity (bpy.types.SpaceUVEditor attribute)](bpy.types.SpaceUVEditor.html#bpy.types.SpaceUVEditor.uv_face_opacity) - [uv_layer (bpy.types.DisplaceModifier attribute)](bpy.types.DisplaceModifier.html#bpy.types.DisplaceModifier.uv_layer)   - [(bpy.types.DynamicPaintSurface attribute)](bpy.types.DynamicPaintSurface.html#bpy.types.DynamicPaintSurface.uv_layer)   - [(bpy.types.FluidFlowSettings attribute)](bpy.types.FluidFlowSettings.html#bpy.types.FluidFlowSettings.uv_layer)   - [(bpy.types.ParticleSettingsTextureSlot attribute)](bpy.types.ParticleSettingsTextureSlot.html#bpy.types.ParticleSettingsTextureSlot.uv_layer)   - [(bpy.types.TexPaintSlot attribute)](bpy.types.TexPaintSlot.html#bpy.types.TexPaintSlot.uv_layer)   - [(bpy.types.UVProjectModifier attribute)](bpy.types.UVProjectModifier.html#bpy.types.UVProjectModifier.uv_layer)   - [(bpy.types.UVWarpModifier attribute)](bpy.types.UVWarpModifier.html#bpy.types.UVWarpModifier.uv_layer)   - [(bpy.types.WarpModifier attribute)](bpy.types.WarpModifier.html#bpy.types.WarpModifier.uv_layer)   - [(bpy.types.WaveModifier attribute)](bpy.types.WaveModifier.html#bpy.types.WaveModifier.uv_layer) - [uv_layer_clone (bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.uv_layer_clone) - [uv_layer_clone_index (bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.uv_layer_clone_index) - [uv_layer_stencil (bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.uv_layer_stencil) - [uv_layer_stencil_index (bpy.types.Mesh attribute)](bpy.types.Mesh.html#bpy.types.Mesh.uv_layer_stencil_index) - [uv_map (bpy.types.ShaderNodeNormalMap attribute)](bpy.types.ShaderNodeNormalMap.html#bpy.types.ShaderNodeNormalMap.uv_map)   - [(bpy.types.ShaderNodeTangent attribute)](bpy.types.ShaderNodeTangent.html#bpy.types.ShaderNodeTangent.uv_map)   - [(bpy.types.ShaderNodeUVMap attribute)](bpy.types.ShaderNodeUVMap.html#bpy.types.ShaderNodeUVMap.uv_map) - [uv_offset (bpy.types.GreasePencilTextureModifier attribute)](bpy.types.GreasePencilTextureModifier.html#bpy.types.GreasePencilTextureModifier.uv_offset) - [uv_on_emitter() (bpy.types.Particle method)](bpy.types.Particle.html#bpy.types.Particle.uv_on_emitter)   - [(bpy.types.ParticleSystem method)](bpy.types.ParticleSystem.html#bpy.types.ParticleSystem.uv_on_emitter) - [uv_opacity (bpy.types.SpaceUVEditor attribute)](bpy.types.SpaceUVEditor.html#bpy.types.SpaceUVEditor.uv_opacity) - [uv_random (bpy.types.BrushGpencilSettings attribute)](bpy.types.BrushGpencilSettings.html#bpy.types.BrushGpencilSettings.uv_random) - [uv_scale (bpy.types.GreasePencilTextureModifier attribute)](bpy.types.GreasePencilTextureModifier.html#bpy.types.GreasePencilTextureModifier.uv_scale) - [uv_sculpt_all_islands (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.uv_sculpt_all_islands) - [uv_sculpt_grab() (in module bpy.ops.sculpt)](bpy.ops.sculpt.html#bpy.ops.sculpt.uv_sculpt_grab) - [uv_sculpt_lock_borders (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.uv_sculpt_lock_borders) - [uv_sculpt_pinch() (in module bpy.ops.sculpt)](bpy.ops.sculpt.html#bpy.ops.sculpt.uv_sculpt_pinch) - [uv_sculpt_relax() (in module bpy.ops.sculpt)](bpy.ops.sculpt.html#bpy.ops.sculpt.uv_sculpt_relax) - [uv_select (bmesh.types.bmesh.types.BMFace attribute)](bmesh.types.html#bmesh.types.bmesh.types.BMFace.uv_select) - [uv_select_check() (in module bmesh.utils)](bmesh.utils.html#bmesh.utils.uv_select_check) - [uv_select_edge (bmesh.types.bmesh.types.BMLoop attribute)](bmesh.types.html#bmesh.types.bmesh.types.BMLoop.uv_select_edge) - [uv_select_edge_set() (bmesh.types.bmesh.types.BMLoop method)](bmesh.types.html#bmesh.types.bmesh.types.BMLoop.uv_select_edge_set) - [uv_select_flush() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_flush) - [uv_select_flush_mode() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_flush_mode) - [uv_select_flush_shared() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_flush_shared) - [uv_select_foreach_set() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_foreach_set) - [uv_select_foreach_set_from_mesh() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_foreach_set_from_mesh) - [uv_select_mode (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.uv_select_mode) - [uv_select_set() (bmesh.types.bmesh.types.BMFace method)](bmesh.types.html#bmesh.types.bmesh.types.BMFace.uv_select_set) - [uv_select_sync_from_mesh() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_sync_from_mesh) - [uv_select_sync_to_mesh() (bmesh.types.bmesh.types.BMesh method)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_sync_to_mesh) - [uv_select_sync_valid (bmesh.types.bmesh.types.BMesh attribute)](bmesh.types.html#bmesh.types.bmesh.types.BMesh.uv_select_sync_valid) - [uv_select_vert (bmesh.types.bmesh.types.BMLoop attribute)](bmesh.types.html#bmesh.types.bmesh.types.BMLoop.uv_select_vert) - [uv_select_vert_set() (bmesh.types.bmesh.types.BMLoop method)](bmesh.types.html#bmesh.types.bmesh.types.BMLoop.uv_select_vert_set) - [uv_shadow (bpy.types.ThemeImageEditor attribute)](bpy.types.ThemeImageEditor.html#bpy.types.ThemeImageEditor.uv_shadow) - [uv_smooth (bpy.types.MultiresModifier attribute)](bpy.types.MultiresModifier.html#bpy.types.MultiresModifier.uv_smooth)   - [(bpy.types.SubsurfModifier attribute)](bpy.types.SubsurfModifier.html#bpy.types.SubsurfModifier.uv_smooth) - [uv_sticky_select_mode (bpy.types.ToolSettings attribute)](bpy.types.ToolSettings.html#bpy.types.ToolSettings.uv_sticky_select_mode) - [uv_texture_add() (in module bpy.ops.mesh)](bpy.ops.mesh.html#bpy.ops.mesh.uv_texture_add) - [uv_texture_remove() (in module bpy.ops.mesh)](bpy.ops.mesh.html#bpy.ops.mesh.uv_texture_remove) - [uvedit_aspect() (bpy.types.Scene method)](bpy.types.Scene.html#bpy.types.Scene.uvedit_aspect) - [UVLoopLayers (class in bpy.types)](bpy.types.UVLoopLayers.html#bpy.types.UVLoopLayers) - [UVProjectModifier (class in bpy.types)](bpy.types.UVProjectModifier.html#bpy.types.UVProjectModifier) - [UVProjectModifier.projectors (in module bpy.types)](bpy.types.UVProjectModifier.html#bpy.types.UVProjectModifier.projectors) - [UVProjector (class in bpy.types)](bpy.types.UVProjector.html#bpy.types.UVProjector) - [uvs_reverse() (in module bpy.ops.mesh)](bpy.ops.mesh.html#bpy.ops.mesh.uvs_reverse) - [uvs_rotate() (in module bpy.ops.mesh)](bpy.ops.mesh.html#bpy.ops.mesh.uvs_rotate) - [UvSculpt (class in bpy.types)](bpy.types.UvSculpt.html#bpy.types.UvSculpt) - [UvSculpt.curve_distance_falloff (in module bpy.types)](bpy.types.UvSculpt.html#bpy.types.UvSculpt.curve_distance_falloff) - [UVWarpModifier (class in bpy.types)](bpy.types.UVWarpModifier.html#bpy.types.UVWarpModifier) |