Select mesh by colour

Hi I was trying to select mesh by colour , but there is still something i miss .

thank you !

ps: for the structural analysis i used the plugin millipede by sawapan.

Attachments:

test1.3dm, 31 KB
test1.gh, 15 KB

Replies to This Discussion

Permalink Reply by David Rutten on July 3, 2017 at 9:30am

What do you mean by "select"?

Permalink Reply by Davide Rando on July 3, 2017 at 10:22am

hi David ,

what i was trying to do is to group all the mesh's faces by their colour, and create a new mesh starting from this "division" , in order to have a mesh with all the faces that are red , blu,green...

Permalink Reply by David Rutten on July 3, 2017 at 1:44pm

Your vertices have colours, meaning each mesh quad actually has 4 different colours on each corner, plus all the blended ones in between. So there's no single 'face colour' you can filter for.

Also it seems like the colours vary gradually across the mesh, rather than being chosen from a discrete palette. This means that even if you were to average all the colours per face and filter based on that, you'd probably just end up with individual faces because no two are exactly alike.

Permalink Reply by Davide Rando on July 4, 2017 at 2:45am

hi David,

i got what you say, do you suggest any strategy in particular? is there anything i can try to solve the problem?

Permalink Reply by David Rutten on July 4, 2017 at 6:51am

The attached file measures the average colour of all faces, then computes the distance from this average colour to some target colour. If this distance is more than some tolerance, the face is removed from the mesh:

Attachments: