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A word of warning

  • I don't work a lot with Python
  • This is still crashing Blender once you connect any output link of the custom node
  • I am just experimenting to see what is possible

Install

  • Just clone this repo in your blender-2.92.0/2.92/scripts/addons/ folder

Debugging the last added node

Just go to the scripting tab and write:

node = bpy.app.driver_namespace["customnode"]

Then use autocomplete etc. like:

Console

Interesting files to learn from

Preview

Node Console

Useful snippets

geonodes = bpy.data.node_groups['Geometry Nodes']
groupinput = geonodes.nodes.get("Group Input")
groupoutput = geonodes.nodes.get("Group Output")

tr = geonodes.nodes.get("Transform")
# Remove default link
geonodes.links.remove(geonodes.links[0])

# If it exists:
customnode = geonodes.nodes['Custom Node']

Stack trace of crash

Stack trace:
blender.exe         :0x00007FF6AB8C1210  GeometryNodesEvaluator::get_unlinked_input_value
blender.exe         :0x00007FF6AB8C1040  GeometryNodesEvaluator::get_input_value
blender.exe         :0x00007FF6AB8BF370  GeometryNodesEvaluator::compute_output_and_forward
blender.exe         :0x00007FF6AB8BF8E0  GeometryNodesEvaluator::execute
blender.exe         :0x00007FF6AB8BEAF0  compute_geometry
blender.exe         :0x00007FF6AB8C1420  modifyGeometry
blender.exe         :0x00007FF6AB6D50B0  modifier_modify_mesh_and_geometry_set
blender.exe         :0x00007FF6AB6D3D30  mesh_calc_modifiers
blender.exe         :0x00007FF6AB6D3A30  mesh_build_data
blender.exe         :0x00007FF6AB6D60F0  makeDerivedMesh
blender.exe         :0x00007FF6AB6B55D0  BKE_object_handle_data_update
blender.exe         :0x00007FF6AB6B5300  BKE_object_eval_uber_data
blender.exe         :0x00007FF6AF37A8F0  std::_Func_impl_no_alloc<std::_Binder<std::_Unforced,void (__cdecl&)(Depsgraph * __ptr64,Main * __p
blender.exe         :0x00007FF6AF378CD0  blender::deg::`anonymous namespace'::evaluate_node
blender.exe         :0x00007FF6AF378C80  blender::deg::`anonymous namespace'::deg_task_run_func
tbb.dll             :0x00007FFB00BA51D0  tbb::interface7::internal::isolate_within_arena
blender.exe         :0x00007FF6AF3FDDD0  tbb::internal::function_task<Task>::execute
tbb.dll             :0x00007FFB00BB37A0  tbb::recursive_mutex::scoped_lock::internal_try_acquire
tbb.dll             :0x00007FFB00BB37A0  tbb::recursive_mutex::scoped_lock::internal_try_acquire
tbb.dll             :0x00007FFB00BA51D0  tbb::interface7::internal::isolate_within_arena
tbb.dll             :0x00007FFB00BAA490  tbb::task_scheduler_init::terminate
tbb.dll             :0x00007FFB00BB19C0  tbb::thread_bound_filter::try_process_item
tbb.dll             :0x00007FFB00BB19C0  tbb::thread_bound_filter::try_process_item
ucrtbase.dll        :0x00007FFB148B1B20  configthreadlocale
KERNEL32.DLL        :0x00007FFB14B17020  BaseThreadInitThunk
ntdll.dll           :0x00007FFB16ADD220  RtlUserThreadStart

Relevant C++ source: (Relevant Blender C++)[https://github.com/blender/blender/tree/master/source/blender/nodes]

Relevant C++ source: (Relevant Blender C++)[https://github.com/blender/blender/tree/master/source/blender/nodes]

Figure out what is different between my custom node and a working node

Difference