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If scaling is all you need, since the ply format is very simple, you could just write a script (e.g. in python) to rescale your cloud, by parsing in the ply and multiplying the coordinates by a factor.

Alternatively you could alter RGBDSLAM to do so. The ply file is written from src/graph_mgr_io.cpp line 430. You could just add the scalling factor in lines 460-462.

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