hello everyone
i want to know how we can import geometries from maya 2011 to houdini
and what format we should use

hi
you can use fbx format houdini handle it very well
or you can use obj format

Alembic is also another good option, especially for caching animated geometry.

jeff
Alembic is also another good option, especially for caching animated geometry.

Alembic comes free with Maya 2013 or above. For lower version you need to buy it. Cool thing is that you can even exchange particles which does not come with maya's default alembic.

hey thank u guys thank u all for the information

If you need to export geometry animation cache like alembic format and you don't have Alembic Exporter Plug-in for maya 2011, You can export your model per frame with Obj format ( Object Sequence !) and import it in the Houdini

This is Soooooooooooo Easy and simple in maya with Scripts .
I wrote a simple Mel script for you in the attached content
Just select your model and run this Mel script in the script editor to export obj sequence in the C Drive from frame 1 to 24

I'd recommend Alembic in general, and perhaps PartIO for particles (or any point clouds). Hopefully there's precompiled partio plugins for Maya )

PartIO is great for particles (it supports lots of formats directly, so you can export particles as .bgeo file sequences and read them directly into Houdini – it's only for particles, but very convenient at that).

Alembic is great for everything else, and it's usage is very flexible in Houdini. For instance, it can (does) store complete object hierarchy info – but in Houdini you can choose if you want to import the hierarchy, or the entire thing as a single geometry, etc. (so you can work with a single object instead of a possibly complicated hierarchy. The Alembic SOP can import everything as a single geo, and has various options to “filter” the input to your liking.)

IMHO, Alembic is the best out there right now (and the sidefx guys work hard at integrating it – and they're doing a great job. It's practically a native Houdini geo type already.)

( shameless plug: the qLib library has an batch-importer utility node that practically builds the scene for you from a bunch of on-disk alembic files, see here: https://www.facebook.com/photo.php?fbid=587440824623039 [facebook.com] )