CloudCompare forum

I have this part of a big model. On the mesh there is a textures. So, I need to elaborate a flat drawing for a restorer. Is it possible with cloud compare?
Yes, I know that it is a model with two direction of distortion and so will be distorted, but is there other solution?
Thank you

Hi,

Sadly it's not possible to do this kind of 'spherical' retro-projection with CloudCompare directly.

With CC you could:

• sample a lot of points on the textured mesh to get a dense point cloud (with colors)
• fit a sphere to determine the center and radius of the dome
• export the cloud as an ASCII file

Then knowing the sphere radius and center, it would be relatively easy to apply the retro-projection on each point of the ASCII file (with any scripting tool such as python, etc.). But of course that's not that easy ;)

And eventually you could load the projected cloud back to CC to generate a visual.

Hi
I'm waking up this post because I think that my question is the same than Geolux. (even if I hope a different answer).

Photographer in a museum of archeology I would like to obtain the unroll picture of the decor on this greek vase.

For the moment I tried 2 method :

- Tools > Projection > Unroll

- Tools > Segmentation > Extract section/Unfold

I know that the problem come from the horizontal and vertical curves like geolux dome.

But could it be possible to have the unroll version totally flat ? Or I can't hope for a better result than the unfold one ?

Thanks in advance for you answer.

If you want a flat unrolled cloud, you "simply" have to set all Y coordinates to 0.

To do this, you have two options:
- save the cloud as ASCII or PLY and then ignore the 'Y' component at loading time (thanks to the specific dialogs of these 2 formats)
- or create a constant scalar field with only zeros (with 'Edit > Scalar fields > Add constant SF') and then set this scalar field as Y coordinate (with 'Edit > Scalar fields > Set SF as coordinate' - and choose the 'Y' coordinate as destination)