Molecular Plus is an advanced particle simulation addon for Blender (4.2 – 5.1+) that brings molecular dynamics and soft-body physics to your 3D scenes. Originally based on the molecular addon by pyroevil, this extended version adds powerful scene creation tools and a completely rewritten high-performance simulation engine.

Animation by The Marble Mechanic

1 Million Particles simulation by u3dreal

Image by tinkerboy123

• Fast Scene Setup: Integrated create panel for rapid scene configuration
• Physics Tab Integration: Cleanly organized in Blender's physics section where it belongs
• N-Panel Access: Quick access to simulation controls and settings
• Collision Detection: Advanced self-collision and object-collision systems
• Link System: Create molecular bonds and structural links between particles
• Material Presets: Pre-configured matter types (sand, water, iron, custom)
• Multi-Platform Support: Windows (x64), macOS (ARM64 & Universal), Linux (x64)

• **python 3.13 for Blender 5.1

Complete Spatial Hash Engine Rewrite: The latest version features a ground-up replacement of the KD-tree spatial search algorithm with a spatial hash grid implementation, delivering:

• 2-4x faster simulation setup
• 1.5-3x faster neighbor queries
• O(1) average query time vs O(log n) for the previous KD-tree
• Better multi-threading with lock-free parallel construction
• Improved cache performance through contiguous memory access
• More consistent frame times with predictable performance

• Cython-based core for maximum performance
• Multi-threaded simulation utilizing all available CPU cores
• O(n) construction time for spatial data structures
• Dynamic neighbor lists with exponential growth strategy
• Block-based memory allocation for reduced fragmentation

• Soft body simulations
• Granular materials (sand, gravel)
• Fluid-like behaviors
• Molecular structures
• Destructible objects
• Cloth and fabric simulation

Get the latest release with pre-compiled wheels for all supported platforms:

Download Molecular Plus

Join the community on Discord for support and discussions. More information available at q3de.com/research/molecular/.

Follow on X (Twitter): @u3dreal

If you find this addon helpful and want to support future development, please consider making a donation:

👉 Become a Sponsor: github.com/sponsors/u3dreal

GPL-3.0-or-later