get element3d models and materials

When i collect a project with element3d effects, i can not collect the element3d models and materials.

I want to know is there a way that can find the models and materials.

I save my `aep` project to `aepx` then i find the tag 

<aRbs><aRbp bdata=""/></aRbs>

but i can not get the value with the script api, may be i does not find it. So can i read the tag ?

Thanks for any help !