First frame geometry popping

[Nicholas Yue]

Hi,

  I am loading an animated alembic cache created on Maya 2018.5 into Cinema4D R21

  We have two caches that have geometry components popping on the first frame (just the first frame)

  We are aware that Maya defaults to start frame 1, C4D defaults to start frame 0, but I believe alembic timing logic is to take the sample from the nearest frame so in C4D, it would take the data from frame 1

  It only happens on some caches from Maya, not all, in fact they are the minority and we have tried re-caching.

  Just wondering if there was a known problem along those areas in the past in Alembic core code ?

Cheers
--

Nicholas Yue
Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5
Custom Dev - C++ porting, OSX, Linux, Windows
http://au.linkedin.com/in/nicholasyue
https://vimeo.com/channels/naiadtools

[Lucas Miller]

What is the TimeSampling when it works vs when it doesn't?

The TimeSampling from abcls -f FILENAME should be a good enough hint.

Lucas

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[Nicholas Yue]

file with geometry no popping

======================
Time Samplings:
0 Uniform Sampling. Start time: 0 Time per cycle: 24
Max Num Samples: 1
1 Uniform Sampling. Start time: 1 Time per cycle: 1
Max Num Samples: 55

file with geometry popping

====================
Time Samplings:
0 Uniform Sampling. Start time: 0 Time per cycle: 24
Max Num Samples: 1
1 Uniform Sampling. Start time: 1 Time per cycle: 1
Max Num Samples: 96

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[Nicholas Yue]

Another data point.

AbcEcho for Alembic 1.7.12 (built Dec 12 2019 16:36:50)
  file written by: Cinema4D
  using Alembic : Alembic 1.7.11 (built May 23 2019 18:19:19)
  written on : Fri Nov  6 16:37:31 2020
  user description : Saved from Cinema4D file: Untitled 1



AbcEcho for Alembic 1.7.12 (built Dec 12 2019 16:36:50)
  file written by: Maya 2018 AbcExport v1.0
  using Alembic : Alembic 1.7.5 (built Feb  7 2018 15:59:45)
  written on : Thu Oct 22 22:32:44 2020
  user description : Exported from: /tmp/tmpcofAq6/DOG01_E104_S0560_ANM.v006.ma