After retopology, .obj file has many duplicate vertices

[cam3d]

[EDIT - I keep forgetting that forum threads spill out over multiple pages.Ignore me - heh]

[Victor Ramamoorthy]

Thanks Andrea. I have duplicate vertices in the original mesh too. I thought that it is because you have limited size dynamic vertex buffer and you keep updating it as you create triangles with correct normals. When you cannot find a specific vertex, you just include it for referencing the triangles. May be that I am wrong with assumption.

[Andrea Alessi]

Hi Victor,

I see the confusion. There are duplicated vertices, but it is not due to the retopology filtering. The retopology filter will not create duplicated vertices out of nowhere.

If you check your dataset, you'll see that the original mesh also has some duplicated vertices too.

This is normal - sometimes we have to duplicate vertices that otherwise would cause the mesh to be non-manifold.

If you run the "remove duplicated vertices" filter in meshlab you can enable the visualizaton of non manifold vertices.

[Victor Ramamoorthy]

Here is the link to share my files: https://drive.google.com/drive/folde...5B?usp=sharing

[Victor Ramamoorthy]

I am uploading the entire project with images tonight.

[Andrea Alessi]

When I looked into OBJ files saved after mesh is created, they all contain duplicate vertices. Here is the proof in the attached jpeg.

Hi Victor,

please share the dataset with us, unfortunately we can't really help from a screenshot only

[Victor Ramamoorthy]

When I looked into OBJ files saved after mesh is created, they all contain duplicate vertices. Here is the proof in the attached jpeg.

[Victor Ramamoorthy]

With small factor less than 2.0, each triangle is broken into 3 triangles with different normals on each triangle - so it works fine. The trouble is with large factors much greater than 2.0.

[Victor Ramamoorthy]

I like what you are doing with retopology. With a large factor value, the mesh is smoothed without needing a spline or bezier patch. However it seems to count the vertices erratically, sometime by 2 and sometimes by six.

[Victor Ramamoorthy]

I will have to upload to my google drive first and then send you a link.

[Victor Ramamoorthy]

Thanks Andrea. I will come back to you after I exhaust the pro trial license that I have. I am having problems with pro so I am back with lite where things seem to be working fairly steadily. Thanks for all the help.

[Andrea Alessi]

Can you please share the project .zep and photos ? Thanks

[Victor Ramamoorthy]

By superimposition, I am turning two meshes - one original and the other after retopology - so that I can see what is happening with vertices. Here is another view where retopology seems to fail even on a smooth surface.

[Andrea Alessi]

In order to make a contour, I need the vertices ordered.

3DF Zephyr Aerial allows you to extract contour lines. I can create a trial for that as well if you wish.