kdtreeparams with 3 dims mat problem

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Hi

I have a problem in dealing with 3dim mat data (i.e., rgb form)

When I try to use it in kdtreeindexparams, error occurs. I guess it is for the reason that its type is 3c (cv_32fc3).

Is there any solutions for dealing with 3d data in flann?

Please give me any advice. Thanks.