Extend Borders

20 votes
Date Updated: 

[UPDATE!] See description below for more

This Tool is useful for extruding border edges of an editable poly. You can also add a tilting angle and choose to use corrected corners.

Additional Info: 

How to use / installation:

If you still have version 1.0 installed, make sure to delete the old files before installing the new one. You need to delete “RacoonScripts_Extend_Borders.mcr” and “extend_borders.mse” in your 3dsmax installation folder (files should be in /scripts/RacoonScripts and the /UI/Macroscripts or /usermacros or /Macroscripts folders, depending on max version.

The easiest way to install it is to run the .mcr via the “Scripting” menu + “Run Script” command. After that, open the “Customize User Interface” dialog and locate the tool in the category “RacoonScripts”. After you have made a hotkey, menu item or button, simply select some edges of your editable poly object and start the tool.

Extrusion Depth = the absolute amount the new edges are extruded
Angle = The tilting angle of the extrusion
Smoothing Group, Inherit = Inherits the smoothing group ID from the adjacent faces
Respect loop ends = If you are not using straighten corners, selections that end on corners are extruded perpendicular to the bending, if this is not desired, activate this option – it will extrude the those edge perpendicular to only the selected edges.

Tips & Tricks:

Alt + Apply = negate the angle value and apply
Alt + Cancel = undo the last apply

Known problems:

* Distorted polygons (e.g. skewed and rotated) may be problematic for the straighten corners algorithm. It’s better to disable this feature in these cases.
* Since it’s a Maxscript it is not very fast in calculation speed. Higher edge counts may slow down the tool considerably.


v1.1 – 2019/04/27
– materialIDs are ported to new faces
– fixed the updating issues in max 2017 and up
– removed encryption, have fun reading but keep in mind that this spaghetti code is OLD (and awful)!

v1.0 – 2014/05/31
– initial release

Version Requirement: 
tested with max 2014, should also work with earlier and later versions
straightencorners_cmprspd.gif1.55 MB


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DeadClown's picture

I haven't even installed 2020

I haven't even installed 2020 yet but I'm already annoyed as hell that they seem to have broken something again... I'll have a look once I install 2020 but this might take a while.

liuqianbo's picture

Compatibility fix for 2020?

Hello! Any chance of another compatibility update for 2020? It seems not working in 3dsmax2020

qqjie_tu_20190805143533.png 41.49 KB
OSTScore's picture

The script works in the 2018

The script works in the 2018 version!!!

3DcubIC's picture


no funciona para 2016 ni para 2017

NaderScript's picture

God bless you developer!

A wonderful script for those with subtle taste in 3d modeling indeed ;)
Thank you so much

Love is all

kavehmad's picture



kyle108's picture

is it possible to get a

is it possible to get a version of this script where the extension depth spinner has 3 decimal places instead of 2? most of my work is done at smaller scales.

Mirk217's picture


I use 3DS Max 2013 x64 wines 8.1 script is not run at all.
click on the button of the reaction is simply no.

miauu's picture


Adding angle option is in my todo list, but I have to find time for it.

vidivini500's picture


Nice miauu :)
Maybe you can add angle option too, is useful

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