Unroll texture issue

[Cramman]

Hi.

I'm new to cloudcompare and trying to use the unroll function. I have a photogrammetry model taken from Pix4d of a concrete shaft and I am trying to unroll in so it can be displayed flat.

I've used Ransac to create a cylinder but when I unroll I'm getting what looks like stretching of the pixels, as shown;

Screenshot 2025-04-22 084102.jpg (232.36 KiB) Viewed 116 times

What am I missing? I've tried with and without the cylinder.

For information, I needed to slightly align the model in z, do I need to do something with the global coordinate system so it's running perfectly down the center?

[daniel]

The issue with a mesh is that the triangles on the border or the unrolled entity will be stretched to meet both ends...

You'll get a nicer result if you sample a lot of points on the mesh first (with 'Edit > Mesh > Sample points'), and then unroll this dense cloud.

[Cramman]

Thanks. I'll have a go now.