GGro | Houdini HDA for Organic Growth Effects (Beta, Non-Commercial)

GGro is a Houdini toolkit designed for organic growth effects.

It includes several solvers and utility nodes that allow for a variety of effects:

All the SOPs available in GGro

Reaction Diffusion

Mesh Fluid Microsolver

Coral Growth

Growth from guides

Harden SOP

Mesh Fluid Microsolver

Reaction Diffusion Microsolver

Reaction Diffusion Microsolver

Space Colonization Solver

You can find more info on the wiki here: https://ggro.notion.site/2f0e2c43873d808eb972c9b3e67a3b03?v=2f0e2c43873d802f81aa000cafb7d120
I also made a presentation at the Cologne Houdini HUG, which you can check out here:https://youtu.be/VR1Cl0LrbDE

Changelog:

• 28/10/25 - v1.0
  • Initial Release
• 29/01/26 - v1.1
  • Fluid Microsolver
  • Performance improvements and bug fixes

Installation Guide:

• In the download files you'll find a zip archive containing the OTLs and a JSON file.
• Unzip the archive in your preferred location
• Copy the JSON file in the "packages" subfolder inside your Houdini home directory (typically located at Documents/houdinixx.x)
• Open the JSON file you've just copied, and replace the path with the location you've used to unzip

Note: Since this is a beta, the UI and the nodes may change, so future updates may not be fully compatible with setups built with the current version. While I am going to try to avoid this as much as possible, the toolkit is still evolving so it's not guaranteed.