View Full Version : Random Particle/ Line Thickness Python script

03-05-2017, 06:47 PM
In the 'Lightwavers are Everywhere' facebook group Mark Warner asked for a specific way to randomly change the Particle/ Line Thickness value for all selected objects. Values should have a specific range defined by the user.

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It is specific to his motion needs but you never know who else could find this useful later on.


Mark Warner says:1x 2point poly chain with a bit of displacement. Radial Arrayed in Layout. Select all chains and run Ludwig's script. Texture using the Instance Info/Fixed Random into a gradient (fortunately they don't have to be instances!). Took about 5 mins where it would otherwise have taken much MUCH longer.

Python File to use, edit or destroy. UI thanx to the cheat sheet @ justaddmilk.org and BAM it works.

#! /usr/bin/env python
# -*- Mode: Python -*-
# -*- coding: ascii -*-

Random value Particle/Line Thickness
- Select one or more objects
- Click the 'RndThick' Button
- change min and max values to your liking
- to cancel out press the 'Escape' button
- to process script, press continue

__author__ = "LAG"
__date__ = "5 march 2017"
__copyright__ = ""
__version__ = ""
__maintainer__ = ""
__email__ = ""
__status__ = ""
__lwver__ = "2015.3"

# ------------------------------------------------------------------------------
# Import Modules
# ------------------------------------------------------------------------------
import lwsdk
import random

class random_thickness(lwsdk.IGeneric):
# Default min and max values to populate initial inputs when ui opens
thicknessMin = 1
thicknessMax = 1
#initialize plugin
def __init__(self, context):
super(random_thickness, self).__init__()
# Start process ----------------------------------
def process(self, ca):
ui = lwsdk.LWPanels()
panel = ui.create("Random Thickness")
#min value
self.float_min_edit = panel.float_ctl("Min Float")
self.float_min_edit.set_event(self.float_min_callb ack)
#max value
self.float_max_edit = panel.float_ctl("Max Float")
self.float_max_edit.set_event(self.float_max_callb ack)
# what to do when user cancels/ close ui panel
if panel.open(lwsdk.PANF_BLOCKING | lwsdk.PANF_RESIZE) == 0:
return lwsdk.AFUNC_OK
# apply randomization to all selected objects
# close ui panel
return lwsdk.AFUNC_OK
# when user inputs value store this value in thickenssMin
def float_min_callback(self, id, data):
self.thicknessMin = self.float_min_edit.get_float()
# when user inputs value store this value in thickenssMin
def float_max_callback(self, id, data):
self.thicknessMax = self.float_max_edit.get_float()
# function to store current user selection and object ID
def user_selection(self):
UserSelection = lwsdk.LWInterfaceInfo().selected_items()
UserSelectionID = []
for item in UserSelection:
# loop through each selected object and apply the random thickness code
for i in range(0, len(UserSelection)):
lwsdk.command("SelectItem " + str(UserSelectionID[i]))
# reselect all objects
for i in range(0, len(UserSelection)):
if i == 0:
lwsdk.command("SelectItem " + UserSelectionID[i])
lwsdk.command("AddToSelection " + UserSelectionID[i])
# randomize between user input values min and max
def changeThickness(self):
newValue = random.uniform(self.thicknessMin, self.thicknessMax)
lwsdk.command("LineThickness " + str(newValue))
# I have no idea what this is for
# LWInstanceFuncs -------------------------------------
def inst_descln(self):
"You should never see this! If you do, run!"

ServerTagInfo = [
( "RndmThick", lwsdk.SRVTAG_USERNAME | lwsdk.LANGID_USENGLISH ),
( "RndmThick", lwsdk.SRVTAG_BUTTONNAME | lwsdk.LANGID_USENGLISH ),
( "Utilities/Python", lwsdk.SRVTAG_MENU | lwsdk.LANGID_USENGLISH )

ServerRecord = {lwsdk.GenericFactory("Random_Thicnkess", random_thickness): ServerTagInfo}

03-06-2017, 03:22 AM
Nnnnnice!   :king:

03-06-2017, 11:51 AM
Thanks Erikals, nice feeling when I run an experimental code and it actually runs. :)