I am splitting an object into two. I am able to do it using the GUI. I go to edit mode, select the vertices I want, then press P and select partition by selection. Can anyone help me with the equivalent in script of pressing P and making the partition by selection. (Not able to find the command in the info window during the operation)



2 Answers 2


Its bpy.ops.mesh.separate(type='SELECTED').

  • $\begingroup$ Hi, thanks for the post. This site is not a regular forum, answers should be substantial, stand on their own, and thoroughly explain the solution and required steps. One liners and short tips rarely make for a good answer. If you can edit your post and provide some more details about the procedure and how it works, perhaps add a few images illustrating some steps and final result. See How to write a good answer?, otherwise it may be converted to a comment. $\endgroup$ Commented Mar 6, 2023 at 13:17

Here is a script I made to split by vertex color. It uses the bpy.ops.mesh.seperate() method as described in another answer. The bulk of it is figuring out what to seperate, but you asked for an example script, so here is one from my toolbox.


Script written by sdfgeoff, Jan 2016
Licensed under GPL, share what you make.'''

import bpy
import mathutils

def splitNextColor(obj, threshold=0.01):
    def getPolyColor(p):
        '''Returns the average colour of a face'''
        colors = obj.data.vertex_colors.active.data
        r = g = b = 0
        for i in p.loop_indices:
            c = colors[i].color
            r += c.r
            g += c.g
            b += c.b
        r /= p.loop_total
        g /= p.loop_total
        b /= p.loop_total
        return mathutils.Vector((r, g, b)) #So we can compare colors using the .length operator 

    #Pick the first polygon
    p = obj.data.polygons[0]
    target = getPolyColor(p)

    for p in obj.data.polygons:
        source = getPolyColor(p)

        #Select any polygons that are similar in colour
        if (source - target).length < threshold:
            p.select = True
            p.select = False

    #Seperate the selected faces

#Get the current object
obj = bpy.context.active_object

selectList = []
if obj.data.vertex_colors.active == None:
    print("Object does not have vertex colors")
    #Split of colours until there are no face left
    while(len(obj.data.polygons) > 0):

    #Delete the no-polygon object that:
    for ob in bpy.context.selected_objects:
        if ob != obj:
            ob.select = False
            ob.select = True


    for ob in selectList:
        ob.select = True

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