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How to merge multi-depth_images?

I am working on a project were three Primesense sensors are being used. Since I am using Hydro I cannot use laser_assembler to merge the laser scans that I am generating. Is there a way to merge the depth images from my three sensors so that I can use depth image to laserscan to create a single laserscan. If not what is the best way of going about this? I am looking at making a merger that takes the laserscan data and merges it into one, but it is a very complex and slow process that I would like to avoid needing.

How to merge multi-depth_images?

I am working on a project were three Primesense sensors are being used. Since I am using Hydro I cannot use laser_assembler to merge the laser scans that I am generating. Is there a way to merge the depth images from my three sensors so that I can use depth image to laserscan to create a single laserscan. If not what is the best way of going about this? I am looking at making a merger that takes the laserscan data and merges it into one, but it is a very complex involves using multiple tf objects and slow process that several conversions between polar and Cartesian coordinate systems for each point. With multiple callbacks and the need to update at 90Hz it will likely need multiple threads or nodes and it will be extremely complex, I really would like to avoid needing.find a less complex solution.