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Rewrite the mitsuba-blender addon - #156

Merged

wjakob merged 231 commits into

mitsuba-renderer:masterfrom

Arthur926564:io-experiments

Sep 6, 2026

Merged

Rewrite the mitsuba-blender addon#156
wjakob merged 231 commits into
mitsuba-renderer:masterfrom
Arthur926564:io-experiments

Commits on Sep 6, 2026
- Make the addon load with the installed Mitsuba 3.9 wheel
  wjakob
  committed
  9b5e92d
- Add pytest-in-Blender test harness with smoke tests
  wjakob
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  ab0a606
- Fix mean extraction in the z-test comparison fixture
  wjakob
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  376f9ba
- Repair the final render path so F12 works again
  wjakob
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  b9136c3
- Plumb the export target directory through the exporter
  wjakob
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  9d39abe
- Fix importer crashes on emitters and mask BSDFs
  wjakob
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  443183b
- Rename the addon package to mitsuba_blender
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  99998b4
- Make test harness addon cleanup idempotent
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  4d08d8c
- Convert the addon into a Blender extension
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  41f1e7f
- Delete the module reload boilerplate
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  bd6139c
- Add a packaging test for the extension build
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  4a7d6e9
- Replace the generated plugin properties with hand-written groups
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  0e2254f
- Confine Blender version checks to a new compat module
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  93f4d30
- Add a double-toggle registration test
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  ca9026c
- Export meshes through mi.Mesh instead of the DNA bridge
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  b57c128
- Instance repeated meshes via session_uid deduplication
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  6e08e07
- Import shapes through mi.Mesh instead of vendored loaders
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- Add a golden render test with a committed EXR reference
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  e326f97
- Add constant folding for material node subgraphs
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  880c9f7
- Route material export through a converter registry
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  a2ebb6f
- Route material import through a converter registry
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  ba6ef6f
- Add a Principled BSDF export converter
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  8c143b8
- Add a principled BSDF import converter
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  9d5fc06
- Add export converters for the basic Cycles BSDF nodes
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  04c2c1c
- Add import converters for Mitsuba's basic BSDF plugins
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  f9126b7
- Add export converters for shader combinator nodes
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  7dd9b93
- Add import converters for Mitsuba BSDF combinators
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  e515218
- Add texture and vector-input converters for material export
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  7a04216
- Add importers for Mitsuba textures and normal/bump wrappers
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  dfea344
- Correct pixel handling for in-memory and unsaved images
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  9fce054
- Add round-trip tests for textured materials
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  33d8d0e
- Add a light exporter in the convert layer
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  3e6008f
- Add a light importer in the convert layer
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  6b42827
- Add a world exporter in the convert layer
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  8233f68
- Add a world importer in the convert layer
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  4a50de1
- Switch scene export to the convert-layer light and world modules
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  d0fdae3
- Switch scene import to the convert-layer light and world modules
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  7368b1b
- Route all material export through the converter registry
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  b49aa17
- Route all material import through the converter registry
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  6f1d3cd
- Fold the diffuse converter into basic.py
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  ae42695
- Wire BSDF Normal inputs through convert_normal_input
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  b114fc6
- Save and restore overridden texture converters in tests
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  456ce09
- Add a reflective principled XML roundtrip test
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  a75d46c
- Import pure area emitter shapes as Blender lights
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  656f147
- Export cameras through the convert layer
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  95b2b12
- Import sensors through the convert layer
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  71bf5c5
- Never abort the import on unsupported content
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  46e0b35
- Make render-settings import opt-in
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  652e479
- Delete the legacy test harness and dead exporter code
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  a760d2b
- Run Mitsuba renders on a worker thread with progress and cancel
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  7c6fa08
- Declare render passes with matching channel identifiers
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  10480e2
- Surface export warnings after rendering and exporting
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  1bbd7ac
- Support running the tests against a local Mitsuba build
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  5822363
- Rewrite the CI test workflow around the new harness
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  c9f86ad
- Bundle Mitsuba wheels into the release extension builds
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  3ef4053
- Rewrite the README for the extension era
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  4bcd6ca
- Skip meshes without faces during export
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  ff037a7
- Export faces of empty material slots with the default BSDF
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  0f12835
- Delete dead helpers left over from the restructure
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  e72aeee
- Parse the scene XML before touching the Blender scene
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  af9a13c
- Skip reference properties when probing conductor reflectance
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  7f61653
- Survive meshes whose invalid faces are deleted by validate()
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  4ad6782
- Extend the never-crash contract to shape and sensor converters
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  ad73783
- Import the children of merge nodes produced by Merge Shapes
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  f8b667d
- Compose sphere center/radius with to_world on import
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  94de70d
- Skip scene-level samplers, films and rfilters in the root pass
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  63dbae6
- Keep earlier imports when importing into a new scene
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  9abc8a5
- Read emitter radiance directly instead of via get_emissive_texture
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  f911c99
- Share one radiance-splitting helper across lights, world and materials
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  76014ad
- Delete dead parameters from the import entry path
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  195d384
- Table-drive the disk, rectangle and cube importers
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  655db4f
- Guard socket tracing and folding against link cycles
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  7ccb0f9
- Export shared emissive meshes as plain shapes, not a shapegroup
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  670d8e9
- Guard scene.cycles reads against a disabled Cycles addon
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  a8a8590
- Sanitize part names built from material names
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  ec1a2ce
- Route world envmap export through the texture converter
  wjakob
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  3ded387
- Clamp out-of-range material indices instead of dropping faces
  wjakob
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  366473b
- Sanitize Color Attribute names in mesh_attribute references
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  74c8d98
- Run mode_set in the export operator, not in scene_to_dict
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  6375576
- Simplify ExportContext.spectrum to the cases that exist
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  d277e37
- Replace ExportedMaterialsCache with a plain dict
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  79825f8
- Trim vestigial ExportContext state
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  30cdf6e
- Use a resources entry instead of resolver juggling in dict_to_scene
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  e10dc29
- Drop the bpy import left unused by the mode_set move
  wjakob
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  66c5429
- Bundle wheels for Python 3.13 alongside 3.11
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  b70dc30
- Keep parse_file from leaking <path> directories into the resolver
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  1a9d32f
- Route use_nodes through compat.py
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  462e832
- Read <path> directories from the parser state when available
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  ae34a82
- Isolate the test harness from the user's Blender profile
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  240b33c
- Render correctly under monochrome and polarized variants
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  180cede
- Install-test the wheel-bundled release zips
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  5ba7e04
- Let a broken daily Blender fail the weekly cron run
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  4982a60
- Stop running the test matrix twice on master pushes
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  15dea81
- Weld exported meshes with Mesh.from_corners when available
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  4aac7f3
- Generate UV coordinates for imported analytic shapes
  
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  9f4f946
- fix: the UV for the sphere shape were upside down
  
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  2169f82
- Support node groups in material export
  
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  2575fa7
- added tests for groups node
  
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  c712faf
- Migrate combinators.py to NodeRef
  
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  3676126
- Added a comment to notify the choice of having a translation from MULTI_GGX to ggx
  
  Arthur926564
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  6429980
- Vectorize sphere UV computation with numpy
  
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  1d5dfd4
- Fix group stack handling in world export, clarify mapping function name
  
  Arthur926564
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  ecfc457
- Add tests for Group nodes and Materials, also update the tests to use NodeRef
  
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  d83d08e
- Strip object scale from perspective camera transform on export
  
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  721ad72
- Add UV coordinates to imported disks and share the UV construction
  
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  230a936
- Export unsupported color inputs as an error color
  
  Arthur926564
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  054f648
- Added Mitsuba texture plugin for Math, Mix, ColorRamp, RGBCurve and Hue Saturation.
  
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  a28aff5
- fix the HUE converter node type name
  
  Arthur926564
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  8848ded
- Port the add-on to the rewritten Mitsuba ``Mesh``
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  1daf5c5
- fix, made the DIVIDE operation more robust to NaN values
  
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  cdd7644
- Adapt import paths to the new Mitsuba path API (patch from Wenzel)
  
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  329db75
- fix: exporting into a xml file exports in-memory bitmaps into images like any othere textures
  
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  13abb18
- add texture plugins invert and brightness_contrast
  
  Arthur926564
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  6977310
- fix made the texture plugins mode robust to division by zero
  
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  f40d68e
- add eval_1_grad into mix texture plugin
  
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  8a3900e
- refactor get_texture inside plugins tree
  
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  5b46c07
- remove unnecessary folders, the upcomming goal will be to not use any folders at all
  
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  af215c1
- export images to disk on the render path
  
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  02f9191
- Reuse exported textures across renders
  
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  5c8d878
- Build the same scene dict for rendering and XML export
  
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  217bdb4
- Approximate textured scalar sockets by samping
  
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  229fd05
- Add rgb_to_bow texture
  
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  fc3c93d
- add converter for gamma and clamp Shader node, remove dead folders
  
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  dba3cbc
- Replace constant folding with texture plugins
  
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  b3ddbd9
- update gitignore
  
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  11daa77
- fix: the error color was updated for debugging purpose, I forgot to take it back to the correct color
  
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  e2cb7b9
- rename tests to match the current addon
  
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  a822be8
- update common.py as has_property has been removed from mitsuba (deprecated)
  
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  01b907f
- update comments
  
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  a422fbb
- Return zero for Object Info instead of failing
  
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  6b29107
- Add strict and relaxed export modes
  
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  6a84c73
- Name curve table by content hash
  
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  576aa33
- Refactor texture converters, update the tests to the new strict mode
  
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  af37410
- add docstrings and refactor the texture plugins
  
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  18e900a
- fix: remove the '\' file
  
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  9979b40
- fix: add import in math.py and corrected get_texture arguments in mix.py
  
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  2c55936
- fix: removed grease pencil from the ui, there is no Mitsuba representation and it is not used in the addon at all.
  
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  1ebed07
- add warning on export when the distribution doesn't have a direct translation into Mitsuba
  
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  bc62c74
- fix: ERROR color should not be used outside the ERROR bsdf
  
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  e9b88ed
- fix hue_saturation and matched it to blender's internal node
  
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  257bd99
- Refactor convert/
  
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  776d6b3
- fix: Glossy roughness to alpha conversion
  
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  562ff55
- fix glossy with texture input test
  
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  e6265f0
- add to_string to all plugins, refactor some docstrings
  
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  eba2e87
- Apply the axis conversion when rendering
  
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  ec91952
- update README
  
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  7b96cc8
- Support the Normal Map node's strength
  
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  a122330
- remove call to _constant_input in bump map converter
  
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  0f5268e
- Remove legacy constant vector exporter
  
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  47693f9
- Remove unused imports
  
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- Scale a textured emission color by the strength
  
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  78b3d50
- Fix: need to eval_1 strength inside eval_3 of normal_map
  
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  a6b8090
- Move the addon preferences out of __init__.py
  
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  9789a8a
- Add tests for axis conversion
  
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  1e4a9e2
- add is_spatially_varying method to all texture plugins
  
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  ced1d4a
- Evaluate constant subgraphs exactly for scalar and vector sockets
  
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  728d743
- Tidy the texture plugins and add dosctring for scalar/vector_from_socket
  
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  a258106
- update README
  
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  cacc994
- add texture noise to the exporter
  
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  bbe69e5
- Fix: in mapping nodes, some vector_type doesn't have a "location" input which result in errors during the export.
  
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  ca3bf6f
- Read the shading position directly when Noise has no Vector input
  
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  23512c3
- Stop using TEX_NOISE texture as the unsupported node in tests
  
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  7c11401
- register the TEX_NOISE plugin
  
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  236cd9c
- Update README
  
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  a4ac4f8
- Fix: allow ADD and MIX BSDF to take only one input
  
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  9a1c6d5
- add node LIGHT_PATH to the exporter
  
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  04f44da
- Start of fix to the light brightness problem
  
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  2097d51
- add test about the strength/scale of emitter in the exporter
  
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  e67fa2f
- Support Alpha of Image Texture nodes
  
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  5e80788
- Fix None check order in _wrap_normalmap
  
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  9e496b0
- Return constant fallback for Ambient Occlusion nodes
  
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  eef3668
- Resolve relative texture paths before mi.load_dict in scalar_from_socket
  
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  3f2d278
- Fix default background detection ignoring user-configured worlds
  
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  df30944
- Reject grayscale images in normal map nodes at export time
  
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  f6f0738
- Support pip-installable plugin discovery via entry points
  
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  17a5506
- Moved the fallback logic from texture to resolver for unsupported node
  
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  433a32a
- Update and refactor all traverse and parameters_changed functions inside texture plugins
  
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  06aeab8
- Resolve relative texture path before mi.load_dict in vector_from_socket
  
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  2653a2b
- Print full traceback on material conversion errors behind debug flag
  
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  37e12a6
- update test to the new support of alpha in normalmap
  
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  9981f8b
- Fix assorted bugs found during code review
  
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  2af099d
- Refactor return statements in import convert_mi_* functions
  
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  5ece4fa
- update docstrings
  
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  b59c89d
- Refactor TEX_IMAGE exporter
  
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  8fd74eb
- Use Mitsuba's new C++ math texture plugin (mitsuba3#1944)
  
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  7d80b94
- Use rgb() from the updated C++ math plugin
  
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  0940953
- Use luminance() from the updated C++ math plugin
  
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  94be7ae
- Use math expressions for RGB Separate Color, keep Python plugin for HSV/HSL
  
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  5c29781
- Remove invert python plugin and use C++ math texture plugin instead
  
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  d56a88d
- Relax the rgb_to_bw test tolerance to account for floating point differences
  
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  75a1d56
- Allow scaled textured emission color in principled BSDF
  
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  8eb0eec
- Fix: use the dict instead of the texture itself
  
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  7b5a509
- resolve FIXME in vect_math plugin by raising when missing op
  
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  6897b28
- fix: the strength of the emitter inside a principled BSDF was always thrown away
  
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  d43cb89
- Enable two-sided emission on area emitters
  
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  81c2bdb
- Export per-object camera visibility as emitter visible flag
  
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  6153f4d
- Don't attach material names to shapes unless a shape has multiple materials
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  33bbdf3
- Exporter handles object's camera visibility
  
  Arthur926564
  authored and
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  committed
  6b82aa1
- Update principled BSDF in order to match the visible and twosided flags
  
  Arthur926564
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  committed
  2c24c08
- Change order in checkerboard texture to match Blender
  
  Arthur926564
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  committed
  912a64f
- FIX: missing return statement and typo inside default_null_bsdf_id
  
  Arthur926564
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  committed
  2e8d790
- convert_parts objects with len(slots) == 0 or slot.material is None are converted to null bsdf
  
  Arthur926564
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  742b33a
- Create a fallback for NewGeometry node
  
  Arthur926564
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  10a69a6
- Resolve file path by basename when the full path doesn't exist
  
  Arthur926564
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  73cc3cf
- Add twosided to all area lights
  
  Arthur926564
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  8978deb
- Resolve relative filenames resursively before instantiating textures
  
  Arthur926564
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  committed
  5b5fa3b
- Search sibling datablocks when pixel data is missing
  
  Arthur926564
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  committed
  6898a68
- Update test in order to match that area emitters are two-sided
  
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  f5075fd
- update README
  
  Arthur926564
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  bce5927
- Fix zero-emission fallback to return black diffuse BSDF on area lights
  
  Arthur926564
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  a7c6cf6
- Skip invisible objects without emitters, use black diffuse for invisible emitters
  
  Arthur926564
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  committed
  2ab8e02
- Import shapes with a black placeholder BSDF as Blender lights
  
  Arthur926564
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  committed
  9be0641
- Update light-export test to match the new emitter diffuse BSDF
  
  Arthur926564
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  54ec452
- Fix: convert_add must returns shader dict instead of NodeRef in every cases
  
  Arthur926564
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  8399078
- Fix: place Red Blue Green into the R, G, B slots respectively inside convert_combine_color
  
  Arthur926564
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  083d9d0
- Fix: convert_mix misses stack=ref.stack on the factor float socket
  
  Arthur926564
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  3d4e92d
- Fix: in vect_math.py, use dr.minimum/dr.maximum instead dr.min/dr.max
  
  Arthur926564
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  cfbb7fe
- Move the definition of ConstantVector inside the register factory
  
  Arthur926564
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  3a9681c
- Fix: ConstantVector is not accessible from the file itself. Look it up through Mitsuba's plugin registry
  
  Arthur926564
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  9690355
- Fix: convert_map_range vector branch KeyErrors when Steps isn't present
  
  Arthur926564
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  e754805
- Remove dead code and unused imports
  
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  f002cba
- Fix: typos
  
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  de7ee4d
- Remove legacy math texture plugin
  
  Arthur926564
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  committed
  d24a3e8
- Fix typo inside io directory
  
  Arthur926564
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  25f9cb5
- Add default active set to true inside texture plugins
  
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  4db9591
- Switch order of checks in export_image for in blend file images
  
  Arthur926564
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  ac6dd18
- Add log when using siblings image in export_image
  
  Arthur926564
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  61191d6
- Fix: use absolute filename in vector_from_socket
  
  Arthur926564
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  5f28b61
- Use vector_from_socket instead of using the default value for principled spec_int value
  
  Arthur926564
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  committed
  eb3faa3
- Refactor BSDF handling inside light exporter
  
  Arthur926564
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  committed
  f067814
- Remove the shared empty-emitter-bsdf placeholder
  
  Arthur926564
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  ef90a64

Commits

Commits on Sep 6, 2026