Is it better/prefered to combine nodelets programmatically or in a launch file?

asked 2011-05-04 15:38:09 -0500

Asomerville
2743 ●74 ●99 ●133 http://www.resquared.com/

updated 2011-05-05 07:27:33 -0500

Is there an advantage to combining nodelets programmatically? I noticed that stereo_image_proc does this and was surprised.

I'm attempting to chain image processing using nodelets to avoid the serialization overhead, and want to combine with stereo_image_proc, but was confused as to whether there was any reason I shouldn't just load up all of the constituent nodelets in a launch file.

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answered 2011-05-05 07:22:59 -0500

tfoote

58457 ●128 ●550 ●526 http://www.ros.org/

updated 2011-05-05 07:24:13 -0500

@kwc is right, there's no advantage, infact if you do it in code you have to rewrite all of the remapping logic done by roslaunch, thus it's actually noteably not recommended.

The image processing work was done to work around ros ticket 3470 It's been fixed on trunk and should be out in the next release, allowing the image pipeline work to be simplified.

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Does this imply that building the stereo_image_proc stack is not possible from a launch file in diamondback?

Asomerville ( 2011-05-05 12:35:53 -0500 )edit

stereo_image_proc only does this for backwards compatibility. The stereo_image_proc node predates nodelets, so I couldn't just replace it with a launch file. Certainly in Electric it's possible to write a simple launch file that replicates the stereo_image_proc node.

Patrick Mihelich ( 2011-09-21 16:57:48 -0500 )edit

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answered 2011-05-05 04:14:00 -0500

kwc
12244 ●54 ●90 ●132 http://kwc.org/

There's no advantage that I'm aware of in terms of performance. Combining via launch files is definitely part of the power and flexibility that nodelets provide.

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Is it better/prefered to combine nodelets programmatically or in a launch file?

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