Skip to main content 홈 크리에이터 impertio-studio blender-bonsai-ifcopenshell-sverchok-claude-skill-package blender-core-versions
blender-core-versions Use when writing Blender Python code that must work across multiple versions (3.x/4.x/5.x), or when migrating scripts between Blender versions. Prevents breakage from renamed APIs, removed modules (bgl in 5.0), and changed function signatures. Provides the complete breaking changes matrix, deprecation timeline, and version-safe coding patterns. Keywords: Blender version, migration, deprecated, breaking change, bgl removal, bpy.app.version, version compatibility, 3.x, 4.x, 5.x, API changes, which Blender version, what changed in Blender 4.
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Zip 다운로드 다운로드 중... aec-agents-workflow-orchestrator Use when a task spans multiple AEC technologies (Blender, IfcOpenShell, Bonsai, Sverchok) and you need to decide which tool handles which step, or when orchestrating multi-step BIM pipelines such as IFC creation to visualization to authoring. Prevents the common mistake of mixing IfcStore.get_file() with ifcopenshell.open() in the same context, or calling Bonsai operators outside a Bonsai-loaded session. Provides decision trees for technology selection, workflow sequencing, and bridge patterns between tools. Keywords: cross-technology, workflow orchestration, BIM pipeline, technology selection, Blender IfcOpenShell Bonsai integration, multi-step AEC, bridge pattern, which tool should I use, combine Blender and IFC, multi-tool workflow, how to connect tools.
Use when implementing end-to-end BIM workflows that combine IfcOpenShell, Bonsai, and Blender -- such as IFC creation from scratch, model enrichment, validation pipelines, geometry extraction, or batch processing of building models. Prevents the common mistake of skipping unit and context setup before creating geometry, or directly modifying IFC attributes instead of using ifcopenshell.api.run(). Covers property set management across tools, spatial hierarchy patterns, and version compatibility for IFC2X3/IFC4/IFC4X3. Keywords: BIM workflow, IFC creation, model validation, property extraction, batch processing, spatial hierarchy, cross-technology, IfcOpenShell Bonsai Blender, pset management, how to create IFC model, step by step BIM, get properties from IFC.
blender-agents-code-validator Use when reviewing, validating, or auditing Blender Python code for correctness. Runs systematic checks for deprecated API usage, context errors, version compatibility issues, threading violations, data reference invalidation, incorrect operator calls, and addon structure compliance. Prevents shipping code with silent version-dependent failures. Keywords: code review, validation, audit, deprecated API, context error, version compatibility, threading, addon structure, code quality, Blender Python, my addon has errors, check my code, why does my script fail.
name blender-core-versions description Use when writing Blender Python code that must work across multiple versions (3.x/4.x/5.x), or when migrating scripts between Blender versions. Prevents breakage from renamed APIs, removed modules (bgl in 5.0), and changed function signatures. Provides the complete breaking changes matrix, deprecation timeline, and version-safe coding patterns. Keywords: Blender version, migration, deprecated, breaking change, bgl removal, bpy.app.version, version compatibility, 3.x, 4.x, 5.x, API changes, which Blender version, what changed in Blender 4.
license MIT compatibility Designed for Claude Code. Requires Blender 3.x/4.x/5.x with Python. metadata {"author":"OpenAEC-Foundation","version":"1.0"}
Blender Core Versions: Python API Version Matrix
1. Quick Reference
Version Detection
import bpy
major, minor, patch = bpy.app.version
if bpy.app.version >= (4 , 0
0
pass
else
pass
Python Version Matrix Blender Python VFX Platform 3.x 3.10 2023 4.0 3.10 2023 4.1 3.11 2024 4.2 LTS 3.11 2024 4.3 3.11 2024 4.4 3.11 2024 4.5 LTS 3.11 2024 5.0 3.11 2025 5.1 3.13 2026
Critical Breaking Changes Summary Change Removed In Migration Context override dicts on bpy.ops 4.0 context.temp_override()MeshEdge.bevel_weight / .crease4.0 mesh.attributes.get("bevel_weight_edge")obj.face_maps4.0 Integer face attributes bone.layers[i] / pose.bone_groups4.0 bone.collectionsNodeTree.inputs/outputs.new()4.0 NodeTree.interface.new_socket()Principled BSDF socket names 4.0 Renamed: Subsurface Weight, Specular IOR Level, etc. 3D_UNIFORM_COLOR shader name4.0 POLYLINE_UNIFORM_COLORPython OBJ/PLY importers 4.0 bpy.ops.wm.obj_import/exportMesh.use_auto_smooth4.1 Mesh.corner_normals + Smooth by Angle modifierLight probe CUBEMAP/PLANAR/GRID 4.1 SPHERE / PLANE / VOLUMEmat.cycles.displacement_method4.1 mat.displacement_methodblender_manifest.toml required4.2 Replace bl_info dict with TOML manifest EEVEE → BLENDER_EEVEE_NEXT 4.2 Check identifier string bpy.types.AttributeGroup4.3 AttributeGroupMesh, AttributeGroupPointCloud, etc.Grease Pencil API rewrite 4.3 Complete API rewrite; see migration guide EEVEE legacy properties 4.3 40+ properties removed Subclass __init__ must call super() 4.4 Forward *args, **kwargs to parent bpy.types.Sequence → bpy.types.Strip4.4 Rename all Sequence references Slotted Actions system 4.4 action.layers[0].strips[0].channelbag()bgl module5.0 gpu module (MANDATORY)scene['cycles'] dict access5.0 Attribute access on RNA properties scene.node_tree (compositor)5.0 scene.compositing_node_groupbrush.sculpt_tool5.0 brush.sculpt_brush_typeaction.fcurves legacy API5.0 Slotted Actions channelbag API VSE end_frame 5.0 length propertyVSE strip time property renames 5.1 frame_final_duration → duration, etc. (removal in 6.0)Python 3.13 5.1 Check stdlib changes
2. Essential Patterns
Version-Safe Conditionals ALWAYS use bpy.app.version tuple comparison. NEVER parse bpy.app.version_string.
import bpy
if bpy.app.version >= (5 , 0 , 0 ):
comp_tree = scene.compositing_node_group
elif bpy.app.version >= (4 , 0 , 0 ):
comp_tree = scene.node_tree
else :
comp_tree = scene.node_tree
Feature Detection Pattern ALWAYS prefer hasattr() checks over version comparisons when testing for a specific API.
import bpy
if hasattr (bpy.types, "AttributeGroupMesh" ):
pass
else :
pass
mesh = bpy.context.active_object.data
if hasattr (mesh, "corner_normals" ):
normals = mesh.corner_normals
else :
mesh.use_auto_smooth = True
Context Override Pattern
override = {"object" : obj, "active_object" : obj}
bpy.ops.object .modifier_apply(override, modifier="Boolean" )
with bpy.context.temp_override(object =obj, active_object=obj):
bpy.ops.object .modifier_apply(modifier="Boolean" )
def apply_modifier (obj, modifier_name ):
if bpy.app.version >= (4 , 0 , 0 ):
with bpy.context.temp_override(object =obj, active_object=obj):
bpy.ops.object .modifier_apply(modifier=modifier_name)
else :
override = {"object" : obj, "active_object" : obj}
bpy.ops.object .modifier_apply(override, modifier=modifier_name)
Node Group Interface Pattern
node_group.inputs.new("NodeSocketFloat" , "Width" )
node_group.outputs.new("NodeSocketGeometry" , "Geometry" )
node_group.interface.new_socket(
name="Width" , in_out='INPUT' , socket_type='NodeSocketFloat'
)
node_group.interface.new_socket(
name="Geometry" , in_out='OUTPUT' , socket_type='NodeSocketGeometry'
)
EEVEE Identifier Pattern
import bpy
def get_eevee_identifier ():
if bpy.app.version >= (5 , 0 , 0 ):
return 'BLENDER_EEVEE'
elif bpy.app.version >= (4 , 2 , 0 ):
return 'BLENDER_EEVEE_NEXT'
else :
return 'BLENDER_EEVEE'
scene = bpy.context.scene
scene.render.engine = get_eevee_identifier()
Extension Manifest Pattern
bl_info = {
"name" : "My Addon" ,
"blender" : (4 , 0 , 0 ),
"category" : "Object" ,
"version" : (1 , 0 , 0 ),
"description" : "My addon description" ,
}
GPU Drawing Pattern (BGL → gpu Migration)
import bgl
bgl.glEnable(bgl.GL_BLEND)
bgl.glLineWidth(2 )
shader = gpu.shader.from_builtin('3D_UNIFORM_COLOR' )
import gpu
gpu.state.blend_set('ALPHA' )
gpu.state.line_width_set(2.0 )
shader = gpu.shader.from_builtin('POLYLINE_UNIFORM_COLOR' )
gpu.state.blend_set('NONE' )
gpu.state.line_width_set(1.0 )
Compositor Access Pattern
scene = bpy.context.scene
scene.use_nodes = True
comp_tree = scene.node_tree
scene = bpy.context.scene
comp_tree = bpy.data.node_groups.new("MyComp" , 'CompositorNodeTree' )
scene.compositing_node_group = comp_tree
Slotted Actions Pattern (4.4+)
action = bpy.data.actions.new("MyAction" )
fcurve = action.fcurves.new(data_path="location" , index=0 )
action = bpy.data.actions.new("MyAction" )
slot = action.slots.new()
layer = action.layers.new(name="Layer" )
strip = layer.strips.new(type ='KEYFRAME' )
channelbag = strip.channelbags.new(slot=slot)
fcurve = channelbag.fcurves.new(data_path="location" , index=0 )
3. Common Operations: Migration Checklists
3.x → 4.0 Migration Checklist
4.0 → 4.1 Migration Checklist
4.1 → 4.2 Migration Checklist
4.2 → 4.3 Migration Checklist
4.3 → 4.4 Migration Checklist
4.x → 5.0 Migration Checklist
5.0 → 5.1 Migration Checklist
4. Reference Links
Official Documentation 