Hair curves exported to alembic cannot be used as ue4.26 groom hair #83838
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Reference: blender/blender#83838
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System Information
Operating system:Windows 10(1909)
Graphics card:AMD R54600U
Blender Version
Broken: 2.91.0,2.90.x,2.8x.x
Short description of error
Hair curves exported to alembic cannot be used as ue4.26 groom hair [so simulation would take place in UE]
When simulation is turned on, the hair is in a mess and appears to have lost weight.Is possible to converted directly from particle Hair to Hair curves?
Seems like UE requires special properties to be defined and written in the alembic file for this to work properly, see https://docs.unrealengine.com/en-US/WorkingWithContent/Hair/AlembicForGrooms/index.html
Exact steps for others to reproduce the error
1,Create particle Hair
2,Convert particle Hair to Mesh
3,Convert Mesh to Curve
4,Select curve and export to alembic(100 scale and only frame 1,only selected)
Added subscriber: @Ag2S
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Needs User Info'
Not quite sure I understand correctly:
https://docs.blender.org/manual/en/dev/files/import_export/alembic.html#particle-systems
if you take this file with dynamic hair:
#83838.blend
you'll end up with said animated curves in alembic (by just exporting to alembic with default settings):
#83838.abc
What exactly is not working for you?
blender.mp4
maya-xgen.mp4
The above is the curves hair abc file exported by blender, and the following is the curves hair abc file exported by Maya xgen. The abc file exported by blender cannot be correctly simulated in UE4.
https://docs.unrealengine.com/en-US/WorkingWithContent/Hair/AlembicForGrooms/index.html
https://docs.unrealengine.com/en-US/WorkingWithContent/Hair/XgenGuidelines/index.html
https://github.com/EpicGames/BlenderTools/issues/136
Videos seem to be recognized as Audio?
Link to the issue on the UE tracker seems dead for me...
its hevc format
OK, plays locally here, at least my firefox doesnt like it though...
Link to UE issue tracker would still help
Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'
Added subscriber: @dr.sybren
Oh, afaics, the simulation takes place in UE [makes sense] and it needs special properties written to the alembic.
That might get classified as feature request or TODO, depends on @sybren.
Changed status from 'Needs Developer To Reproduce' to: 'Needs User Info'
Added subscriber: @wiwa
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Removed subscriber: @wiwa
Changed status from 'Needs User Info' to: 'Archived'
Please stick to formats/codecs that are widely supported in webbrowsers. WebM/VC9 and MP4/h.264 are the safe choices.
This is a feature request, and not a bug report, though. It is notoriously difficult to get curves in Alembic to work cross-DCC, as curve parameters are highly under-documented in Alembic.
As for the custom properties that need to be defined, it might be possible to write those by actually setting them as custom properties in Blender. These are exported to Alembic since Blender 2.91.
Added subscriber: @khyota