Select vertices according to vertex color ?

Support Modeling
#1

Is there a way to be able to select vertices based on a give vertex color assigned to them?
What I need, basically, is to paint vertex colors over a terrain; select vertices, that painted in a particular color, and then split the terrain mesh.
Does Blender have such ability or maybe there is a script available?
Thanks.

#2

anyone, pls? or do I need to post into Blender news?

#3

I m looking for the same kind of script… :frowning:

#4

seen something like this using particules somewhere !

go to python forum and ask there for a script 2.5
or for particule painting for terrain versus height color !

but don’t remember where !

happy 2.5

#5

hey motorsep! I just did a script that select all face with black vertex color.

select_black_faces.blend (172 KB)

Test it ,maybe it can help :slight_smile:

open the file
select the mesh
enter edit mode
and press alt-p in the text area…

#6

this looks it is for 2.49 do you have it for 2.5 ?

thanks happy 2.5

#7

@RickyBlender

No i still work with 2.49…

#8

suggestion
open a thread in python and ask some help to port in 2.5

there will probably people ready to help with this!

good luck happy 2.5

#9

Thanks Benny_Flex, will try that!

#10 
import bpy
from mathutils import Color

threshold = .1
obj = bpy.context.object

bpy.ops.object.mode_set(mode="OBJECT")

colors = obj.data.vertex_colors.active.data
selected_polygons = list(filter(lambda p: p.select, obj.data.polygons))

if len(selected_polygons):
    p = selected_polygons[0]
    r = g = b = 0
    for i in p.loop_indices:
        c = colors[i].color
        r += c[0]
        g += c[1]
        b += c[2]
    r /= p.loop_total
    g /= p.loop_total
    b /= p.loop_total
    target = Color((r, g, b))

    for p in obj.data.polygons:
        r = g = b = 0
        for i in p.loop_indices:
            c = colors[i].color
            r += c[0]
            g += c[1]
            b += c[2]
        r /= p.loop_total
        g /= p.loop_total
        b /= p.loop_total
        source = Color((r, g, b))

        print(target, source)

        if (abs(source.r - target.r) < threshold and
            abs(source.g - target.g) < threshold and
            abs(source.b - target.b) < threshold):

            p.select = True

bpy.ops.object.editmode_toggle()
6 Likes
Is this UV texture to mask sculpting techniqe possible in Blender?
#11

Hi for this problem, I have made an addon which you can buy. This addon makes it pretty easy withing shift + G menu.

1 Like
#13

Smilex55, does the most recent version 1.1 work in 2.93, if not do you plan on upgrading?

#14

Thanks for this–Totally worth €1!