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)
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

Inherited Functions

References

Table Of Contents

Previous topic

NodeSocketVirtual(NodeSocketStandard)

Next topic

NodeTreeInputs(bpy_struct)