Houdini 21 MPM Solver

  / houdini-21-mpm-138000148  

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Houdini 21 brings a major upgrade to the MPM (Material Point Method) solver, and I’ve put together a playground project where you can freely explore and tweak the newest tools. It’s technical yet playful—a great way to dip in and learn.

What’s New in Houdini 21 MPM (from SideFX)

Sleeping controls to speed up sims when particles are largely static

Automatic Resimulation, resetting and recalculating the start frame when anything affecting the DOP changes

Enhanced Surface Tension: choose Point-Based (accurate, stable) or Grid-Based (fast for large systems) methods

Deterministic Particle-to-Grid default for consistent, reproducible sims and faster handling of densely packed points

Smarter Collision controls for more reliable interactions
SideFX

On the Source, Collider, and Container side:

Emit particles on top of existing ones using positive pressure (great for whipped cream effects!)

Phase IDs to separate interactions when using point-based surface tension

age attribute generation for particles

Expanded Velocity controls and deforming collider interpolation (“Expand to Cover Velocity”)

Start-state override for sleeping behavior

Upper/Lower Padding on containers

Per-voxel stickiness and friction control
SideFX

Post-processing tools:

MPM Surface SOP: outputs VDBs or meshes for renderable geometry

MPM Debris Source: extracts points where material breaks—great for secondary debris sims

MPM Post-Fracture and MPM Deform Pieces: fracture and transfer dynamics to geometry for destruction workflows
SideFX

A handy MPM shelf with example setups

Neural Point Surfacing: AI-powered algorithms to rebuild surfaces from point clouds—smooth, detailed results

VDB improvements (non-uniform scaling, pivot centering, collider animation coverage)
SideFX

Your Playground Setup Includes:

A basic MPM scene with toggles to switch tension modes, enable deterministic solving, and test sleeping behavior

Emission demos with positive pressure and phase IDs

A quick post-process path: MPM → Surface → Debris → Fracture → Deform Pieces

A neural surfacing example to explore AI-enhanced reconstruction


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amazing how houdini is used for feature movies and block buster movies by creating yop notch stat of the art visual effect.
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