Live 2022.08.21

Advecting Lines via Pyro

Scene File

Get the Houdini scene here: data_disk_sim_007.hiplc

Summary

Simple setup where a particle simulation is driven by pyro velocity field. The geometry in the particle simulation is continuously resampled using a sop solver to maintain evenly spaced line segments and prevent some spiking artifacts.

I use some simple VEX code to only allow velocities in the vel field in areas above a certain threshold. This helps keep some parts of the line structure rigid and intact while other areas above the threshold are free to move.

v@vel *= length(@vel)>.005;

After the simulation, the curves get their normal by sampling the velocity field from the pyro sim. This gives you a consistent (non-flickering) orientation of the curves when you render them.

Video On Demand

• 00:00 Scene Setup
• 03:30 Particle Sim Setup
• 11:50 Pyro Smoke Sim Setup
• 21:00 Bringing Vel Field into Particle Sim
• 40:00 Tweaking Simulation Parameters
• 1:52:00 Redshift Lighting Setup
• 2:15:00 Redshift PostFX
• 2:17:51 Rendering a Quick Preview Animation
• 2:29:00 Wrapping Up

Additional Scene Files

data_disk_sim_001.hiplc

data_disk_sim_002.hiplc

data_disk_sim_003.hiplc

Additional Images