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ok, so I all instance are unpacked to full geo ? so How you can render a lots instance (a forest for exemple) without impact to the vram and GPU ?

You need to use the conventional Houdini instancing workflows, like the Instance OBJ node, or the "instance" point attribute pointing to the object to be instanced. Probably the "instance" attribute is more useful because you can set the instance object to be rendered on each point.

Thanks,
-Juanjo

Perfect, thanks.

is it faster to use ORBX for instanced object instead of alembic ? I have maybe more feature using ORBX from houdini ?

You can indeed instance a .orbx proxy object. Probably it could be faster because you are going to avoid all the object extraction time, but be aware that the .orbx file should have all the information related to materials and so on inside.

Thanks,
-Juanjo

excellent juan, thanks, I need to enjoy and learn deep now

is it possible to overrides material's ORBX instance channel ? for exemple make a color variations between the instances ? thanks

Although Octane doesn't support the user attributes in the instances yet (currently it supports vertex data for the meshes, curves and particles), the Houdini plugin has a trick to pack the Cd attribute inside an Id that later can be used to get the Cd color using an encoded texture map available in the plugin folder.

You have more details here:
viewtopic.php?f=101&t=73105&p=372155&hi ... cd#p372155

Thanks,
-Juanjo

Thanks for the link !

I have just tested on houdini obj Instance, in my instance I created Cd attribute on points scatter/grid, I assigned to instance the Texture/ppm image through a octane network shop. No color render. In your url you dont use a Instance example but a built-in octane sphere scattering. Any recommendation about the setup ?