Generated Point Cloud has no colors

Hi everyone, when generating a merged.ply file and open it with

import open3d as o3d
pcd = o3d.io.read_point_cloud('merged.ply')
print(pcd.colors)

it gives me

std::vector<Eigen::Vector3d> with 0 elements.
Use numpy.asarray() to access data.

Am I doing something wrong or does the point cloud come without colors?

[digvijayad]

According to here: http://gamma.cs.unc.edu/POWERPLANT/papers/ply.pdf and here: http://paulbourke.net/dataformats/ply/ The red, green, and blue are the standard ply headers, whereas diffuse_red, ambient_red, or specular red are user-defined elements.

Also worth noting is that the old ply, with ‘diffuse_’ prefix, when exported through MeshLab generates headers without ‘diffuse_’ prefix.

On Wed, 13 Jul 2022 at 19:34, Piero Toffanin @.***> wrote:

Worth noting that this is probably an issue with open3d and not with OpenSfM per-se, PLY doesn’t really have a “standard” and the current PLY outputs from OpenSfM are just fine (as shown by the ability of Meshlab to open them).

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[digvijayad]

@fabianschenk I have created the PR.