Alembic camera issue #49081

New Issue

Ejner Fergo · 2016-08-12T22:48:51+02:00

Ejner Fergo commented

2016-08-12 22:48:51 +02:00

System Information
Arch Linux 64bit

Blender Version
Broken: 2.77.3 04c7d9d

Short description of error
Loading an Alembic file containing animated camera focal length in external applications, the value is shifted one frame relative to Blender.

Exact steps for others to reproduce the error
In the provided .blend the focal length starts at 25mm and ends at 35mm over 20 frames. Sensor size is APS-C to double check that this property is exported, and/or the field of view is correct. Tested external applications:
Houdini Apprentice
Gaffer (http://imageengine.github.io/gaffer)

Here's an image explaining the issue:

If only 1 frame is exported from Blender, the correct focal length and FOV is loaded in the above external applications, but obviously without animation. Exporting all frames, and the one frame shift is there.

abc_cam_tst1.blend
abc_cam_tst1.abc

**System Information** Arch Linux 64bit **Blender Version** Broken: 2.77.3 04c7d9d **Short description of error** Loading an Alembic file containing animated camera focal length in external applications, the value is shifted one frame relative to Blender. **Exact steps for others to reproduce the error** In the provided .blend the focal length starts at 25mm and ends at 35mm over 20 frames. Sensor size is APS-C to double check that this property is exported, and/or the field of view is correct. Tested external applications: Houdini Apprentice Gaffer (http://imageengine.github.io/gaffer) Here's an image explaining the issue: ![abc_cam.png](https://archive.blender.org/developer/F336321/abc_cam.png) If only 1 frame is exported from Blender, the correct focal length and FOV is loaded in the above external applications, but obviously without animation. Exporting all frames, and the one frame shift is there. [abc_cam_tst1.blend](https://archive.blender.org/developer/F336323/abc_cam_tst1.blend) [abc_cam_tst1.abc](https://archive.blender.org/developer/F336324/abc_cam_tst1.abc)

Kévin Dietrich was assigned by Ejner Fergo

2016-08-12 22:48:51 +02:00

Ejner Fergo commented

2016-08-12 22:48:51 +02:00

Changed status to: 'Open'