Molecular Script Addon

The Molecular Script is an addon for Blender 2.8 that makes particles collide. In addition it makes links between the particles. So making collisions and links are the two most important things the addon can do.

Since there are a loads, read: loooaads, of settings in the addon, I will show you to get the hang of the addon. Start with a simple particle system in the learning fase. This because you need to re-calculate every time you change a setting. The video below gives you a good introduction to this addon.

Molecular Script Addon – Blender 2.8

How the Molucular Script Addon works

For those who don’t have acces to the video, here are few notes of what is discussed in the video.

  • Start with a simple particle system. This saves a lot of time. Later, when you get the hang of the addon, make a more complicated particle system.
  • For example: 50 particles, starting from frame 1 to 50. Give the particles a life-time of 130 frames.
  • Then in the Properties Panel – Particles, enable: Molecular Script.
  • In Short; Enable collisions and links. Collisions prevents particles to intersect but can give a kind of explosion effect. To get rid of that explosion effect enable Links, so that particle don’t fly away to far. (Sorry for the layman terms, but it’s probably more clear than using academic terms. If not, let me know).
  • Because you need to run the simulation after you change any setting, it’s an idea to right click on the button called “Start Molecular Simulation”. Then choose for the option to add it to the favorites. If you press then Q, you will see the option to Start the Molecular Simulation. And so, you don’t have to scroll down all the time, trying to find that button. For more documentation look on Pyroevel’s page, see link below.

Where to download the Molecular Script Addon?

The latest version for Blender 2.93 seems to be available here: This addon was written before by Pyroevil, but ported over to Blender 2.8 by scorpion81. There is another version here: which worked for me in Blender 2.93 but it seems not for everyone?.

In case there are any problems with the installation, read the notes on Pyroevil’s page which is an old page but may help.

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12 thoughts on “Molecular Script Addon

  • March 17, 2020 at 3:20 pm

    Can i run the “Molecular Simulation” within a script in Blender? Without having to click the button?

  • December 31, 2020 at 12:27 am

    Got: ImportError: cannot open shared object file: No such file or directory
    When trying to activate
    Using Blender 2.91 on ubuntu 20.04

  • June 2, 2021 at 11:12 am

    I am Getting This Error Only……

    Traceback (most recent call last):
    File “E:\Shivam\Softwares\blender-2.93.0-stable+blender-v293-release.383bc8d9bc06-windows.amd64-release\blender-windows64\2.93\scripts\modules\”, line 386, in enable
    File “C:\Users\SHIVAM\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\molecular\”, line 42, in register
    from . import properties, ui, operators
    File “C:\Users\SHIVAM\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\molecular\”, line 7, in
    from . import simulate, core
    ImportError: cannot import name ‘core’ from ‘molecular’ (C:\Users\SHIVAM\AppData\Roaming\Blender Foundation\Blender\2.93\scripts\addons\molecular\

  • July 10, 2021 at 2:58 pm

    Did you ever get this solved? I have the same error on PC and Mac so I’ve never been able to use Molecular

  • July 11, 2021 at 11:05 am

    I have the same error, did anyone find a solution?

  • July 16, 2021 at 3:21 pm

    Appreciate the reply, but I’m afraid I get the same error trying the version in your link, and Pyroevil’s page (to debug install issues) seems to be gone.


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