Houdini Fx: Dynamic Particle Controls – Masking, and Grouping in Houdini!
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Hey everyone! 🎉 Today, I'm diving into some super handy VEX setups that’ll bring a fresh twist to your particle simulations. With these snippets, you can control particle size over time, create distance-based masks, and organize particles into groups based on proximity—basically all the magic ingredients for complex, interactive effects!
1. Scaling Particles by Age
In the first snippet, particles evolve in size based on their age, perfect for effects like growing dust, particles that shrink as they get older, or anything with natural decay! A quick normalization of the @age attribute lets you scale it over its life span, with the help of ramps for custom falloffs.
Controls:
Min Scale / Max Scale – Set your particle size limits!
Scale Ramp – Shape the growth over time with ease.
2. Distance-Based Masking for Smooth Falloffs
For the second snippet, we’re creating a mask attribute that calculates the distance of each particle to the nearest point from the second input. The closer the particle is to that reference, the higher the mask value—great for adding localized effects like fading, force fields, or directional motion.
Controls:
Max Distance / Min Distance – Control where the mask starts and fades.
Mask Ramp – Adjust falloff smoothly for custom shapes.
3. Threshold-Based Grouping with Color Control
This last setup uses distance thresholds to group particles as either close or far from a target object. It’s ideal for triggering separate behaviors in different particle zones or applying different colors based on proximity!
Controls:
Threshold – Adjust the distance required to classify particles as “far.”
This .hip file is ready for you to explore! It’s set up to be easily customizable so you can tweak the controls to fit any project. Curious to see how this works in action? Become a member of my Patreon, where I’ll be sharing more deep dives and .hip files just like this! 🔥
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