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Cleanup and README update for first public release
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‎.gitignore‎

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testing/**
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!testing/*
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*.pyc

‎README.md‎

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# Blender Datasmith addon
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# Blender Datasmith Export
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This addon lets you export your blender scene to UE4 using the Datasmith
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format.
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Export your Blender scene to UE4 using the Datasmith format.
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You can see a brief overview of how it works here:
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It aims to export all the Datasmith format supports. For now it exports:
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* __Meshes__ with normals, vertex colors and UV coordinates.
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* __Hierarchy__ is exported keeping meshes references, transforms, parents and
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per-instance material overrides from blender.
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* __Textures and materials__ are exported using data from the shader graphs.
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Materials are closely approximated and a good amount of nodes are supported
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(math, mix, fresnel, vertex color and others)
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* __Cameras__ are exported trying to match Blender data, keeping focus
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distance, focal length, and aperture
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* __Lights__ are exported, keeping their type, power, color and size data.
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Check out an overview of a previous version here:
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https://youtu.be/bUUDqerdqAc
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The plugin is currently in preview status, you can try it by [getting the
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testing source build](https://github.com/0xafbf/blender-datasmith-export/archive/master.zip)
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and install from the blender addons preferences pane.
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## Sample:
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__Blender Eevee:__
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![Blender Eevee render](docs/blender.jpg)
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__UE4 using Datasmith:__
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![UE4 render](docs/unreal.jpg)
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This result relies on the **DatasmithBlenderContent**, which is a UE4 Plugin
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that improves material import compatibility. Consider supporting the project by
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purchasing it from the Epic Store or Gumroad (more info coming soon)
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This result is in a custom UE4 build, which fixes some issues of the UE4
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importer. If you are technical to compile the engine, you can check the fork
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[here][ue4 fork]. Hopefully we can get to integrate our fixes into the main
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branch.
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[ue4 fork]: https://github.com/0xafbf/UnrealEngine/tree/master
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Now [__Download the latest version__][download_link] and install from the
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Blender addons preferences pane.
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[download_link]: https://github.com/0xafbf/blender-datasmith-export/archive/master.zip
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If you want to support the project, also consider supporting via [Patreon],
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even if it is a little it adds up.
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[patreon]: https://www.patreon.com/0xafbf
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This is a work in progress, if you want to contribute to improve it, feel free
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to submit pull requests or support me on Patreon:
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https://www.patreon.com/0xafbf
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Please please, [join the project Discord][join_discord] and share your results!
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I want to see what you make and I am open to any feedback you have.
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This is an unofficial exporter. If you would like to get in touch, please [join the project Discord](https://discord.gg/h2GHqMq)
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[join_discord]: https://discord.gg/h2GHqMq
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‎__init__.py‎

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bl_info = {
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"name": "Unreal Datasmith format",
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"author": "Andrés Botero",
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"version": (0, 1, 0),
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"blender": (2, 80, 0),
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"version": (0, 1, 1),
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"blender": (2, 81, 0),
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"location": "File > Export > Datasmith (.udatasmith)",
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"description": "Export scene as Datasmith asset",
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"warning": "",

‎docs/blender.jpg‎

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‎docs/unreal.jpg‎

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‎export_datasmith.py‎

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n.push(Node("1", exp_1))
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return {"expression": exp_list.push(n)}
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def exp_mixrgb(node, exp_list):
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exp_1 = get_expression(node.inputs['Color1'], exp_list)
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exp_2 = get_expression(node.inputs['Color2'], exp_list)
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return exp_list.push(lerp)
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op_custom_functions = {
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"HUE_SAT": "/BlenderDatasmithAdditions/MaterialFunctions/AdjustHSV",
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"MAPPING_TEX2D": "/BlenderDatasmithAdditions/MaterialFunctions/MappingTexture2D",
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"MAPPING_POINT2D": "/BlenderDatasmithAdditions/MaterialFunctions/MappingPoint2D",
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"LAYER_WEIGHT": "/BlenderDatasmithAdditions/MaterialFunctions/LayerWeight",
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"CURVE_RGB": "/BlenderDatasmithAdditions/MaterialFunctions/RGBCurveLookup",
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"CURVE_RGB": "/DatasmithBlenderContent/MaterialFunctions/RGBCurveLookup",
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"FRESNEL": "/DatasmithBlenderContent/MaterialFunctions/BlenderFresnel",
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"HUE_SAT": "/DatasmithBlenderContent/MaterialFunctions/AdjustHSV",
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"LAYER_WEIGHT": "/DatasmithBlenderContent/MaterialFunctions/LayerWeight",
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"MAPPING_POINT2D": "/DatasmithBlenderContent/MaterialFunctions/MappingPoint2D",
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"MAPPING_TEX2D": "/DatasmithBlenderContent/MaterialFunctions/MappingTexture2D",
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"NORMAL_FROM_HEIGHT": "/Engine/Functions/Engine_MaterialFunctions03/Procedurals/NormalFromHeightmap",
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"FRESNEL": "/BlenderDatasmithAdditions/MaterialFunctions/BlenderFresnel",
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}
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# TODO: this depends on having the material functions in UE4
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def exp_hsv(node, exp_list):
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n = Node("FunctionCall", { "Function": op_custom_functions["HUE_SAT"]})

‎testing/README.md‎

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# Testing tools
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In this folder there is a python script that runs the export command, with some
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extra steps for testing, and a powershell script that runs the command on
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different test files. you can use these as sample scripts for your convenience.
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‎testing/export_all.ps1‎

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# build all files
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# & blender -b archiviz/archiviz.blend -P test_datasmith_export.py
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# & blender -b pabellon_barcelona/pavillon_barcelone_v1_2.blend -P test_datasmith_export.py
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# & blender -b classroom/classroom.blend -P test_datasmith_export.py
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& blender -b $PSScriptRoot/the_junk_shop/the_junk_shop.blend -P $PSScriptRoot/test_datasmith_export.py
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# & blender -b barbershop/barbershop_interior_cpu.blend -P test_datasmith_export.py
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# & blender -b bmw27GE\BMW27GE.blend -P test_datasmith_export.py

‎testing/test_datasmith_export.py‎

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#
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#
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# datasmith export test suite
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# run this file with the following command:
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# blender -b sample_file.blend -P test_datasmith_export.py
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import bpy.ops
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import bpy
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import os
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import logging
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import time
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import shutil
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logging_level = logging.INFO # WARNING, INFO, DEBUG
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# logging_level = logging.DEBUG # WARNING, INFO, DEBUG
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logging.basicConfig(
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level=logging_level,
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# format='%(asctime)s.%(msecs)03d %(name)-12s %(levelname)-8s %(message)s',
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format='%(asctime)s.%(msecs)03d %(levelname)-8s %(message)s',
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datefmt='%Y-%m-%d %H:%M:%S'
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)
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log = logging.getLogger()
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clean_path = os.path.normpath(bpy.data.filepath)
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base_dir, file_name = os.path.split(clean_path)
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name, ext = os.path.splitext(file_name)
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target_path = os.path.join(base_dir, name + ".udatasmith")
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log.info("basedir %s", base_dir)
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use_diff = True
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backup_path = None
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if use_diff and os.path.isfile(target_path):
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log.info("backing up previous test")
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last_modification_time = os.path.getmtime(target_path)
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time_str = time.strftime('%Y%m%d_%H%M%S', time.localtime(last_modification_time))
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backup_path = os.path.join(base_dir, "%s_%s.udatasmith" % (name, time_str))
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log.debug("last modification was:%s", backup_path)
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shutil.copy(target_path, backup_path)
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log.info("Starting automated export")
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custom_args = {}
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custom_args["experimental_tex_mode"] = True
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custom_args["apply_modifiers"] = True
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bpy.ops.export_scene.datasmith(filepath=target_path, **custom_args)
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log.info("Ended automated export")
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# right now this is not so useful as the export is non deterministic
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# i guess it is because the usage of dictionaries
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if backup_path:
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log.info("writing diff file")
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import difflib
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with open(backup_path) as ff:
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from_lines = ff.readlines()
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with open(target_path) as tf:
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to_lines = tf.readlines()
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diff = difflib.unified_diff(from_lines, to_lines, backup_path, target_path)
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new_modification_time = os.path.getmtime(target_path)
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new_time_str = time.strftime('%Y%m%d_%H%M%S', time.localtime(new_modification_time))
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diff_path = os.path.join(base_dir, "export_diff_%s.diff" % new_time_str)
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with open(diff_path, 'w') as diff_file:
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diff_file.writelines(diff)
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static_diff_path = os.path.join(base_dir, "export_diff.diff")
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shutil.copy(diff_path, static_diff_path)
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