hello I have a model that I have animated in motion builder, I would like to import it into houdini to use to drive particle system. please help me, OBJ will no be animated.

If you can export the animated geometry as a Wavefront OBJ file sequence, you can then use a File SOP to load them into Houdini.

In Houdini 8.1, you can use Collada Import [sidefx.com] so if you can export to a Collada file format through Motion Builder, that will work too.

Cheers!
steven

i try to export an OBJ but it is just the model. I do not know how to make it animated

as stevenong mentioned, you have to export every frame of the animation as .obj file. ( name.$F4.obj)

load the sequence into houdini: file sop-> name.$F4.obj

There are MEL scripts around (odforce.net?) that will dump out a series of animating frames from Maya to obj files (one for each frame).

-Craig

Does Collada import properly handle all the joint to bone translations and skinning and motion curves and maintain everything?

Or is it baking things?

-Craig

I think it imports keyframes.