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[lampelys <>]

Hi

I have a point cloud containing 408 797 points with unoriented normal
vectors in a file. This file is about 20 MB large.

I am basically using the same code as:
examples/Point_set_processing_3/normals_example.cpp, without normal
estimation.

When running, I get a error that indicates memory overflow. This happens at
the line 385 in mst_orient_normals.h: return riemannian_graph;

While I am debugging the create_riemannian_graph-method my memory usage for
my program is around 200 MB. When I hit 385 line however, this memory usage
dramatically starts to rise. It goes up to well over 1 GB before the error
is cast.

I've tried to split up my point cloud and to decrease the k nearest
neighbors to 5 with success, but the results was not acceptable.
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