Water Bubble Generator v2 - Houdini 20

The Bubblizer V2 is here! The response to v1 was inspiring, so I decided to add a few cool new features along with a lot of cleanup and optimization. Here's what you're getting:

1. The ability to "bubblize" input geometry with some fun growth solver controls
2. More intuitive controls for bubble scale, burst probability, and secondary bubbles and trails
3. Cleaner meshing and cache management
4. Custom mask attribute to blend shader settings between input and bubble sim geometry
5. Custom AOV matte (Karma) to easily blend render passes in compositing applications like After Effects and Nuke
6. Some minor bug fixes

All the renders and screen captures in the above preview were generated from this file. Although the lighting and rendering setup is in Solaris/Karma, this is a standard Houdini file that can be used with other renderers like Redshift and Octane

This file covers a lot of ground, so my hope is that this can also be a useful learning tool for students and anyone that's new to Houdini. To that end I've added sticky notes throughout the file, and did my best to keep all the networks as compact and straightforward as possible.

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