That is what I was looking for. You think I would have clicked that by now just out of curiosity. I did not see it in the manual but I was looking fast. I have a little trouble with shadows but if I use a plane and flip the normals it seems to work. A head mesh seems to cast on itself.

That will work.
I did this project before and it is difficult to see mistakes and many adjustments needs to be made to the mesh mask. I was hoping for something like the mask material in BI or the holdout in cycles.
Thanks Ill do that.

A object as a mask to mask another object.
Its a animation with video sequence background . Video of putting on the head a tracked object( headphones with with dots). I use a head model for the mask . I put the helmet model on the head model and the head model masks out the parts of the helmet ...

How do I mask off parts of my mesh showing the background?
I have been working on this all morning.Im doing a animated helmet like in the Stargate movie.
Is that enough info? It is a basic question.
Thanks

Thanks for the replays. That is great news.

Oh thanks . I have octane 1.2 . Maybe my student Blender plugin is a older version as I can not find a "export alembic".
Thanks.
One more thing with the Blender plugin. I can not add a image texture to the world settings. There is no link to open image. In the nodes I have a world output node but ...

I am assuming I can not import animations. Did I ask the question wrong?
I am unable to post in the Blender plugin section, that's because I have a student license?
You do not render from octane but a plugin?

I'm wanting to export animations from blender to the standalone. I'm using the integrated plugin downloaded form here otoy.
I thought I saw in Octane play pause and back buttons. I see now they are render buttons.
Thanks

I can not open a animation/ obj sequence in Octane?
I'm using blender. I can not find how to open a image texture in environment.
Thanks