How to select vertices with a specific colour, and fit curve through a subset of these vertices?

Grasshopper
1

Hi all,
I’m currently trying to write a grasshopper definition that takes a mesh (3d scan imported as an obj file with color) and converts coloured lines on the mesh to curves.

scan%20with%20texture
scan%20with%20texture1159×781 117 KB

I’m able to get only the vertices with a certain color. But in a next step i want to fit a curve through a subset of these vertices.

scan%20with%20texture%202
scan%20with%20texture%2021480×675 226 KB

In rhino this works fine with the CurveThroughPt command.

scan%20with%20texture%204
scan%20with%20texture%2041052×649 373 KB

But when i try to achieve the same in grasshopper I end up with a curve like the one in the image below.

scan%20with%20texture%205
scan%20with%20texture%2051291×774 256 KB

I guess the problem is that the points in my list are not in the right order.
I’ve been searching the forum but i cannot find a good way to solve this.
color based line.gh (2.6 MB)

Thanks,
Tom

2

In this case, Sequential Closest Points from neoarchaic could be useful.


Canvas%20at%2017%3B53%3B16
Canvas at 17;53;16.jpg1523×586 174 KB

color based line_re.gh (2.6 MB)

3

That’s exactly what i was looking for
Thanks!