NodeTree(ID)

Poll Function

The NodeTree.poll function determines if a node tree is visible in the given context (similar to how Panel.poll and Menu.poll define visibility). If it returns False, the node tree type will not be selectable in the node editor.

A typical condition for shader nodes would be to check the active render engine of the scene and only show nodes of the renderer they are designed for.

import bpy


class CyclesNodeTree(bpy.types.NodeTree):
    """ This operator is only visible when Cycles is the selected render engine"""
    bl_label = "Cycles Node Tree"

    @classmethod
    def poll(cls, context):
        return context.scene.render.engine == 'CYCLES'

bpy.utils.register_class(CyclesNodeTree)

base classes — bpy_struct, ID

subclasses — ShaderNodeTree, CompositorNodeTree, TextureNodeTree

class bpy.types.NodeTree(ID)

Node tree consisting of linked nodes used for shading, textures and compositing

active_input

Index of the active input

Type :int in [0, inf], default 0

active_output

Index of the active output

Type :int in [0, inf], default 0

animation_data

Animation data for this datablock

Type :AnimData, (readonly)

bl_description

Type :string, default “”, (never None)

bl_icon

The node tree icon

Type :enum in [‘NONE’, ‘QUESTION’, ‘ERROR’, ‘CANCEL’, ‘TRIA_RIGHT’, ‘TRIA_DOWN’, ‘TRIA_LEFT’, ‘TRIA_UP’, ‘ARROW_LEFTRIGHT’, ‘PLUS’, ‘DISCLOSURE_TRI_DOWN’, ‘DISCLOSURE_TRI_RIGHT’, ‘RADIOBUT_OFF’, ‘RADIOBUT_ON’, ‘MENU_PANEL’, ‘BLENDER’, ‘GRIP’, ‘DOT’, ‘X’, ‘GO_LEFT’, ‘PLUG’, ‘UI’, ‘NODE’, ‘NODE_SEL’, ‘FULLSCREEN’, ‘SPLITSCREEN’, ‘RIGHTARROW_THIN’, ‘BORDERMOVE’, ‘VIEWZOOM’, ‘ZOOMIN’, ‘ZOOMOUT’, ‘PANEL_CLOSE’, ‘COPY_ID’, ‘EYEDROPPER’, ‘LINK_AREA’, ‘AUTO’, ‘CHECKBOX_DEHLT’, ‘CHECKBOX_HLT’, ‘UNLOCKED’, ‘LOCKED’, ‘UNPINNED’, ‘PINNED’, ‘SCREEN_BACK’, ‘RIGHTARROW’, ‘DOWNARROW_HLT’, ‘DOTSUP’, ‘DOTSDOWN’, ‘LINK’, ‘INLINK’, ‘PLUGIN’, ‘HELP’, ‘GHOST_ENABLED’, ‘COLOR’, ‘LINKED’, ‘UNLINKED’, ‘HAND’, ‘ZOOM_ALL’, ‘ZOOM_SELECTED’, ‘ZOOM_PREVIOUS’, ‘ZOOM_IN’, ‘ZOOM_OUT’, ‘RENDER_REGION’, ‘BORDER_RECT’, ‘BORDER_LASSO’, ‘FREEZE’, ‘STYLUS_PRESSURE’, ‘GHOST_DISABLED’, ‘NEW’, ‘FILE_TICK’, ‘QUIT’, ‘URL’, ‘RECOVER_LAST’, ‘FULLSCREEN_ENTER’, ‘FULLSCREEN_EXIT’, ‘BLANK1’, ‘LAMP’, ‘MATERIAL’, ‘TEXTURE’, ‘ANIM’, ‘WORLD’, ‘SCENE’, ‘EDIT’, ‘GAME’, ‘RADIO’, ‘SCRIPT’, ‘PARTICLES’, ‘PHYSICS’, ‘SPEAKER’, ‘TEXTURE_SHADED’, ‘VIEW3D’, ‘IPO’, ‘OOPS’, ‘BUTS’, ‘FILESEL’, ‘IMAGE_COL’, ‘INFO’, ‘SEQUENCE’, ‘TEXT’, ‘IMASEL’, ‘SOUND’, ‘ACTION’, ‘NLA’, ‘SCRIPTWIN’, ‘TIME’, ‘NODETREE’, ‘LOGIC’, ‘CONSOLE’, ‘PREFERENCES’, ‘CLIP’, ‘ASSET_MANAGER’, ‘OBJECT_DATAMODE’, ‘EDITMODE_HLT’, ‘FACESEL_HLT’, ‘VPAINT_HLT’, ‘TPAINT_HLT’, ‘WPAINT_HLT’, ‘SCULPTMODE_HLT’, ‘POSE_HLT’, ‘PARTICLEMODE’, ‘LIGHTPAINT’, ‘SCENE_DATA’, ‘RENDERLAYERS’, ‘WORLD_DATA’, ‘OBJECT_DATA’, ‘MESH_DATA’, ‘CURVE_DATA’, ‘META_DATA’, ‘LATTICE_DATA’, ‘LAMP_DATA’, ‘MATERIAL_DATA’, ‘TEXTURE_DATA’, ‘ANIM_DATA’, ‘CAMERA_DATA’, ‘PARTICLE_DATA’, ‘LIBRARY_DATA_DIRECT’, ‘GROUP’, ‘ARMATURE_DATA’, ‘POSE_DATA’, ‘BONE_DATA’, ‘CONSTRAINT’, ‘SHAPEKEY_DATA’, ‘CONSTRAINT_BONE’, ‘CAMERA_STEREO’, ‘PACKAGE’, ‘UGLYPACKAGE’, ‘BRUSH_DATA’, ‘IMAGE_DATA’, ‘FILE’, ‘FCURVE’, ‘FONT_DATA’, ‘RENDER_RESULT’, ‘SURFACE_DATA’, ‘EMPTY_DATA’, ‘SETTINGS’, ‘RENDER_ANIMATION’, ‘RENDER_STILL’, ‘BOIDS’, ‘STRANDS’, ‘LIBRARY_DATA_INDIRECT’, ‘GREASEPENCIL’, ‘GROUP_BONE’, ‘GROUP_VERTEX’, ‘GROUP_VCOL’, ‘GROUP_UVS’, ‘RNA’, ‘RNA_ADD’, ‘OUTLINER_OB_EMPTY’, ‘OUTLINER_OB_MESH’, ‘OUTLINER_OB_CURVE’, ‘OUTLINER_OB_LATTICE’, ‘OUTLINER_OB_META’, ‘OUTLINER_OB_LAMP’, ‘OUTLINER_OB_CAMERA’, ‘OUTLINER_OB_ARMATURE’, ‘OUTLINER_OB_FONT’, ‘OUTLINER_OB_SURFACE’, ‘OUTLINER_OB_SPEAKER’, ‘RESTRICT_VIEW_OFF’, ‘RESTRICT_VIEW_ON’, ‘RESTRICT_SELECT_OFF’, ‘RESTRICT_SELECT_ON’, ‘RESTRICT_RENDER_OFF’, ‘RESTRICT_RENDER_ON’, ‘OUTLINER_DATA_EMPTY’, ‘OUTLINER_DATA_MESH’, ‘OUTLINER_DATA_CURVE’, ‘OUTLINER_DATA_LATTICE’, ‘OUTLINER_DATA_META’, ‘OUTLINER_DATA_LAMP’, ‘OUTLINER_DATA_CAMERA’, ‘OUTLINER_DATA_ARMATURE’, ‘OUTLINER_DATA_FONT’, ‘OUTLINER_DATA_SURFACE’, ‘OUTLINER_DATA_SPEAKER’, ‘OUTLINER_DATA_POSE’, ‘MESH_PLANE’, ‘MESH_CUBE’, ‘MESH_CIRCLE’, ‘MESH_UVSPHERE’, ‘MESH_ICOSPHERE’, ‘MESH_GRID’, ‘MESH_MONKEY’, ‘MESH_CYLINDER’, ‘MESH_TORUS’, ‘MESH_CONE’, ‘LAMP_POINT’, ‘LAMP_SUN’, ‘LAMP_SPOT’, ‘LAMP_HEMI’, ‘LAMP_AREA’, ‘META_EMPTY’, ‘META_PLANE’, ‘META_CUBE’, ‘META_BALL’, ‘META_ELLIPSOID’, ‘META_CAPSULE’, ‘SURFACE_NCURVE’, ‘SURFACE_NCIRCLE’, ‘SURFACE_NSURFACE’, ‘SURFACE_NCYLINDER’, ‘SURFACE_NSPHERE’, ‘SURFACE_NTORUS’, ‘CURVE_BEZCURVE’, ‘CURVE_BEZCIRCLE’, ‘CURVE_NCURVE’, ‘CURVE_NCIRCLE’, ‘CURVE_PATH’, ‘COLOR_RED’, ‘COLOR_GREEN’, ‘COLOR_BLUE’, ‘FORCE_FORCE’, ‘FORCE_WIND’, ‘FORCE_VORTEX’, ‘FORCE_MAGNETIC’, ‘FORCE_HARMONIC’, ‘FORCE_CHARGE’, ‘FORCE_LENNARDJONES’, ‘FORCE_TEXTURE’, ‘FORCE_CURVE’, ‘FORCE_BOID’, ‘FORCE_TURBULENCE’, ‘FORCE_DRAG’, ‘FORCE_SMOKEFLOW’, ‘MODIFIER’, ‘MOD_WAVE’, ‘MOD_BUILD’, ‘MOD_DECIM’, ‘MOD_MIRROR’, ‘MOD_SOFT’, ‘MOD_SUBSURF’, ‘HOOK’, ‘MOD_PHYSICS’, ‘MOD_PARTICLES’, ‘MOD_BOOLEAN’, ‘MOD_EDGESPLIT’, ‘MOD_ARRAY’, ‘MOD_UVPROJECT’, ‘MOD_DISPLACE’, ‘MOD_CURVE’, ‘MOD_LATTICE’, ‘CONSTRAINT_DATA’, ‘MOD_ARMATURE’, ‘MOD_SHRINKWRAP’, ‘MOD_CAST’, ‘MOD_MESHDEFORM’, ‘MOD_BEVEL’, ‘MOD_SMOOTH’, ‘MOD_SIMPLEDEFORM’, ‘MOD_MASK’, ‘MOD_CLOTH’, ‘MOD_EXPLODE’, ‘MOD_FLUIDSIM’, ‘MOD_MULTIRES’, ‘MOD_SMOKE’, ‘MOD_SOLIDIFY’, ‘MOD_SCREW’, ‘MOD_VERTEX_WEIGHT’, ‘MOD_DYNAMICPAINT’, ‘MOD_REMESH’, ‘MOD_OCEAN’, ‘MOD_WARP’, ‘MOD_SKIN’, ‘MOD_TRIANGULATE’, ‘REC’, ‘PLAY’, ‘FF’, ‘REW’, ‘PAUSE’, ‘PREV_KEYFRAME’, ‘NEXT_KEYFRAME’, ‘PLAY_AUDIO’, ‘PLAY_REVERSE’, ‘PREVIEW_RANGE’, ‘PMARKER_ACT’, ‘PMARKER_SEL’, ‘PMARKER’, ‘MARKER_HLT’, ‘MARKER’, ‘SPACE2’, ‘SPACE3’, ‘KEYINGSET’, ‘KEY_DEHLT’, ‘KEY_HLT’, ‘MUTE_IPO_OFF’, ‘MUTE_IPO_ON’, ‘VISIBLE_IPO_OFF’, ‘VISIBLE_IPO_ON’, ‘DRIVER’, ‘SOLO_OFF’, ‘SOLO_ON’, ‘FRAME_PREV’, ‘FRAME_NEXT’, ‘VERTEXSEL’, ‘EDGESEL’, ‘FACESEL’, ‘ROTATE’, ‘CURSOR’, ‘ROTATECOLLECTION’, ‘ROTATECENTER’, ‘ROTACTIVE’, ‘ALIGN’, ‘SMOOTHCURVE’, ‘SPHERECURVE’, ‘ROOTCURVE’, ‘SHARPCURVE’, ‘LINCURVE’, ‘NOCURVE’, ‘RNDCURVE’, ‘PROP_OFF’, ‘PROP_ON’, ‘PROP_CON’, ‘SCULPT_DYNTOPO’, ‘PARTICLE_POINT’, ‘PARTICLE_TIP’, ‘PARTICLE_PATH’, ‘MAN_TRANS’, ‘MAN_ROT’, ‘MAN_SCALE’, ‘MANIPUL’, ‘SNAP_OFF’, ‘SNAP_ON’, ‘SNAP_NORMAL’, ‘SNAP_INCREMENT’, ‘SNAP_VERTEX’, ‘SNAP_EDGE’, ‘SNAP_FACE’, ‘SNAP_VOLUME’, ‘STICKY_UVS_LOC’, ‘STICKY_UVS_DISABLE’, ‘STICKY_UVS_VERT’, ‘CLIPUV_DEHLT’, ‘CLIPUV_HLT’, ‘SNAP_PEEL_OBJECT’, ‘GRID’, ‘PASTEDOWN’, ‘COPYDOWN’, ‘PASTEFLIPUP’, ‘PASTEFLIPDOWN’, ‘SNAP_SURFACE’, ‘AUTOMERGE_ON’, ‘AUTOMERGE_OFF’, ‘RETOPO’, ‘UV_VERTEXSEL’, ‘UV_EDGESEL’, ‘UV_FACESEL’, ‘UV_ISLANDSEL’, ‘UV_SYNC_SELECT’, ‘BBOX’, ‘WIRE’, ‘SOLID’, ‘SMOOTH’, ‘POTATO’, ‘ORTHO’, ‘LOCKVIEW_OFF’, ‘LOCKVIEW_ON’, ‘AXIS_SIDE’, ‘AXIS_FRONT’, ‘AXIS_TOP’, ‘NDOF_DOM’, ‘NDOF_TURN’, ‘NDOF_FLY’, ‘NDOF_TRANS’, ‘LAYER_USED’, ‘LAYER_ACTIVE’, ‘SORTALPHA’, ‘SORTBYEXT’, ‘SORTTIME’, ‘SORTSIZE’, ‘LONGDISPLAY’, ‘SHORTDISPLAY’, ‘GHOST’, ‘IMGDISPLAY’, ‘SAVE_AS’, ‘SAVE_COPY’, ‘BOOKMARKS’, ‘FONTPREVIEW’, ‘FILTER’, ‘NEWFOLDER’, ‘OPEN_RECENT’, ‘FILE_PARENT’, ‘FILE_REFRESH’, ‘FILE_FOLDER’, ‘FILE_BLANK’, ‘FILE_BLEND’, ‘FILE_IMAGE’, ‘FILE_MOVIE’, ‘FILE_SCRIPT’, ‘FILE_SOUND’, ‘FILE_FONT’, ‘FILE_TEXT’, ‘RECOVER_AUTO’, ‘SAVE_PREFS’, ‘LINK_BLEND’, ‘APPEND_BLEND’, ‘IMPORT’, ‘EXPORT’, ‘EXTERNAL_DATA’, ‘LOAD_FACTORY’, ‘LOOP_BACK’, ‘LOOP_FORWARDS’, ‘BACK’, ‘FORWARD’, ‘FILE_BACKUP’, ‘DISK_DRIVE’, ‘MATPLANE’, ‘MATSPHERE’, ‘MATCUBE’, ‘MONKEY’, ‘HAIR’, ‘ALIASED’, ‘ANTIALIASED’, ‘MAT_SPHERE_SKY’, ‘WORDWRAP_OFF’, ‘WORDWRAP_ON’, ‘SYNTAX_OFF’, ‘SYNTAX_ON’, ‘LINENUMBERS_OFF’, ‘LINENUMBERS_ON’, ‘SCRIPTPLUGINS’, ‘SEQ_SEQUENCER’, ‘SEQ_PREVIEW’, ‘SEQ_LUMA_WAVEFORM’, ‘SEQ_CHROMA_SCOPE’, ‘SEQ_HISTOGRAM’, ‘SEQ_SPLITVIEW’, ‘IMAGE_RGB’, ‘IMAGE_RGB_ALPHA’, ‘IMAGE_ALPHA’, ‘IMAGE_ZDEPTH’, ‘IMAGEFILE’, ‘BRUSH_ADD’, ‘BRUSH_BLOB’, ‘BRUSH_BLUR’, ‘BRUSH_CLAY’, ‘BRUSH_CLAY_STRIPS’, ‘BRUSH_CLONE’, ‘BRUSH_CREASE’, ‘BRUSH_DARKEN’, ‘BRUSH_FILL’, ‘BRUSH_FLATTEN’, ‘BRUSH_GRAB’, ‘BRUSH_INFLATE’, ‘BRUSH_LAYER’, ‘BRUSH_LIGHTEN’, ‘BRUSH_MASK’, ‘BRUSH_MIX’, ‘BRUSH_MULTIPLY’, ‘BRUSH_NUDGE’, ‘BRUSH_PINCH’, ‘BRUSH_SCRAPE’, ‘BRUSH_SCULPT_DRAW’, ‘BRUSH_SMEAR’, ‘BRUSH_SMOOTH’, ‘BRUSH_SNAKE_HOOK’, ‘BRUSH_SOFTEN’, ‘BRUSH_SUBTRACT’, ‘BRUSH_TEXDRAW’, ‘BRUSH_THUMB’, ‘BRUSH_ROTATE’, ‘BRUSH_VERTEXDRAW’, ‘MATCAP_01’, ‘MATCAP_02’, ‘MATCAP_03’, ‘MATCAP_04’, ‘MATCAP_05’, ‘MATCAP_06’, ‘MATCAP_07’, ‘MATCAP_08’, ‘MATCAP_09’, ‘MATCAP_10’, ‘MATCAP_11’, ‘MATCAP_12’, ‘MATCAP_13’, ‘MATCAP_14’, ‘MATCAP_15’, ‘MATCAP_16’, ‘MATCAP_17’, ‘MATCAP_18’, ‘MATCAP_19’, ‘MATCAP_20’, ‘MATCAP_21’, ‘MATCAP_22’, ‘MATCAP_23’, ‘MATCAP_24’], default ‘NODETREE’

bl_idname

Type :string, default “”, (never None)

bl_label

The node tree label

Type :string, default “”, (never None)

grease_pencil

Grease Pencil datablock

Type :GreasePencil

inputs

Node tree inputs

Type :NodeTreeInputs bpy_prop_collection of NodeSocketInterface, (readonly)

links

Type :NodeLinks bpy_prop_collection of NodeLink, (readonly)

nodes

Type :Nodes bpy_prop_collection of Node, (readonly)

outputs

Node tree outputs

Type :NodeTreeOutputs bpy_prop_collection of NodeSocketInterface, (readonly)

type

Node Tree type (deprecated, bl_idname is the actual node tree type identifier)

• SHADER Shader, Shader nodes.
• TEXTURE Texture, Texture nodes.
• COMPOSITING Compositing, Compositing nodes.

Type :enum in [‘SHADER’, ‘TEXTURE’, ‘COMPOSITING’], default ‘SHADER’, (readonly)

view_center

Type :float array of 2 items in [-inf, inf], default (0.0, 0.0), (readonly)

interface_update(context)

Updated node group interface

classmethod poll(context)

Check visibility in the editor

Return type:boolean

update()

Update on editor changes

classmethod get_from_context(context)

Get a node tree from the context

Return (result_1, result_2, result_3):  

result_1, Active node tree from context, NodeTree

result_2, ID data block that owns the node tree, ID

result_3, Original ID data block selected from the context, ID

Inherited Properties

bpy_struct.id_data ID.name ID.users ID.use_fake_user ID.tag

ID.is_updated ID.is_updated_data ID.is_library_indirect ID.library

Inherited Functions

bpy_struct.as_pointer bpy_struct.driver_add bpy_struct.driver_remove bpy_struct.get bpy_struct.is_property_hidden bpy_struct.is_property_set bpy_struct.items bpy_struct.keyframe_delete bpy_struct.keyframe_insert bpy_struct.keys

bpy_struct.path_from_id bpy_struct.path_resolve bpy_struct.property_unset bpy_struct.type_recast bpy_struct.values ID.copy ID.user_clear ID.animation_data_create ID.animation_data_clear ID.update_tag

References

BlendData.node_groups BlendDataNodeTrees.new BlendDataNodeTrees.remove CompositorNodeGroup.node_tree Lamp.node_tree Material.node_tree Node.poll Node.poll_instance NodeCustomGroup.node_tree NodeGroup.node_tree NodeInternal.poll NodeInternal.poll_instance NodeTree.get_from_context

NodeTreePath.node_tree Scene.node_tree ShaderNodeGroup.node_tree SpaceNodeEditor.edit_tree SpaceNodeEditor.node_tree SpaceNodeEditorPath.push SpaceNodeEditorPath.start Texture.node_tree TextureNodeGroup.node_tree UILayout.template_node_link UILayout.template_node_view World.node_tree