Export Import alembic camera with Python

[kiryha]

Hi, guys

I need to exchange camera animation between scenes and I guess that Alembic is a good option for this. I can import the alembic camera:
 

OBJ = hou.node('/obj/')
CAM = OBJ.createNode('alembicarchive', 'CAM')
CAM.parm('fileName').set('C:/temp/cam.abc')
CAM.parm('buildHierarchy').pressButton()

Now I need to figure out how can I export the camera from my scene...

I can export camera with Alembic ROP but maybe there is a more elegant solution?

sceneRoot = hou.node('/obj/')

# Get camera object
camera = hou.node('obj/{}'.format(cameraName))

# Get Camera parent nodes
listCameraNodes = '{}'.format(camera.name())
for i in camera.inputAncestors():
    listCameraNodes += ' {}'.format(i.name())


# Create ROP network
ROP = sceneRoot.createNode('ropnet')
ABC = ROP.createNode('alembic')
ABC.parm('trange').set(1)
ABC.parm('filename').set('C:/temp/camera_001.abc')
ABC.parm('objects').set(listCameraNodes)
ABC.parm('execute').pressButton()
ROP.destroy()

cameraExportImportABC_001.hiplc

Edited February 13, 2019 by kiryha

[alexnet]

To import a camera through alembic, a good solution is not to use the Build Hierarchy every time, but read the parameters directly from it using the module.

>>> import _alembic_hom_extensions as abc

http://www.sidefx.com/docs/houdini/hom/abc_extensions.html

From it you can pull out all the transformations and some data on the camera.

For export, it is better to have a HDA in which you could indicate the path to the camera where all its parameters would be read, after that the camera would be baked and then exported to Alembic.