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[Václav Šmilauer <eudoxos@xxxxxxxx>]

> +	PhysicalParameters* p_bottom = static_cast<PhysicalParameters*>((*bodies)[wall_bottom_id]->physicalParameters.get());
> +	PhysicalParameters* p_top   =	 static_cast<PhysicalParameters*>((*bodies)[wall_top_id]->physicalParameters.get());
> +	PhysicalParameters* p_left  = static_cast<PhysicalParameters*>((*bodies)[wall_left_id]->physicalParameters.get());
> +	PhysicalParameters* p_right = static_cast<PhysicalParameters*>((*bodies)[wall_right_id]->physicalParameters.get());
> +	PhysicalParameters* p_front = static_cast<PhysicalParameters*>((*bodies)[wall_front_id]->physicalParameters.get());
> +	PhysicalParameters* p_back  = static_cast<PhysicalParameters*>((*bodies)[wall_back_id]->physicalParameters.get());

I think you don't have to cast those, as physicalParameters are already
of type shared_ptr<PhysicalParameters>. 

 PhysicalParameters* p_bottom=(*bodies)[wall_bottom_id]->physicalParameters.get();

should just work IMHO.