v2.0.0

What's New in v2.0

Math Upgrades

• Exact OU transition formula (Gillespie 1996) — zero discretization error, no substep loops
• Implicit spring filter (Klak-style) — unconditionally stable at any timestep
• Voss-McCartney 1/f pink noise detail layer — true organic micro-texture

New Features

• Rotation noise — independent OU process with its own speed, per-axis amplitude (pitch/yaw/roll)
• Detail + Detail Layers — adds fractal richness, respects Smoothing
• 6-channel output: tx, ty, tz, rx, ry, rz

Parameter Renames

• Reversion → Center Pull
• Roughness → Smoothing (inverted: 1 = smooth, 0 = raw)
• Center → Anchor

Bug Fixes

• Speed=0 stops instantly (no settling delay)
• TD timeline pause freezes the script
• Smoothing no longer changes perceived speed (narrowed omega range)
• Detail respects Smoothing (applied before spring filter)
• Init at Anchor (no cold-start drift)
• par.enable moved to enableExpr (prevents cook loops)

Testing

• 26 automated tests covering all parameters at extreme values

v1.2.1 — Clean Release (TD 2025+)

Patch release with clean script and version requirement.

• TD 2025+ required — uses CookLevel.ALWAYS and 2025.x absTime behavior
• Removed enableExpr that caused setup failures on some versions
• Clean single-file script (src/brownian_motion.py)

All core features from v1.2.0 intact:

• Decoupled spring filter (smooth at any speed)
• sqrt(speed) spring scaling
• Per-axis range toggle
• Module-level state (no cook loop)

Full changelog: v1.2.0...v1.2.1

v1.2.0 — Smooth at Any Speed

What's New

Decoupled Spring Filter

The critically-damped spring now runs at real frame time, separate from the OU simulation. Previously the spring ran inside the OU substep loop — at high speeds it was chasing 20+ random jumps per frame and couldn't smooth anything. Now the OU evolves at speed-scaled time, and the spring smoothly interpolates toward wherever it lands. Crank speed to 100 with roughness=0 and it's still butter.

sqrt(speed) Spring Scaling

The spring's natural frequency scales with sqrt(speed) instead of linearly. At speed=10 the spring is 3.2x stiffer (not 10x), keeping motion smooth while still tracking faster OU evolution.

Per-Axis Range

New Per-Axis Range toggle — set different min/max bounds per axis. X can be [-180, 180] degrees while Z is [-10, 10] centimeters. Irrelevant range params are greyed out based on the toggle and axis enable state.

Parameter Enable Logic

• Per-Axis Range OFF: uniform Range Min/Max active, per-axis params greyed out
• Per-Axis Range ON: per-axis params active, uniform greyed out
• Affect X/Y/Z OFF: corresponding per-axis range params also greyed out

Cook Loop Fix

Replaced scriptOp.store()/fetch() with module-level state dict — eliminates the cook dependency loop that was freezing animation. Added CookLevel.ALWAYS for guaranteed per-frame cooking.

Detailed Parameter Docs

README rewritten with plain-English descriptions for every parameter.

Full Parameter List

Motion: Range Min/Max, Speed, Amplitude, Reversion, Roughness
Range: Per-Axis Range toggle, Range Min/Max X/Y/Z
Axes: Affect X, Affect Y, Affect Z
Advanced: Center X/Y/Z, Seed, Independent, Reset

Install

Download the .tox below and drag it into your TouchDesigner project.

Brownian Motion v1.0.0

Brownian Motion v1.0.0

Ornstein-Uhlenbeck brownian motion Script CHOP for TouchDesigner.

Features

• Mean-reverting procedural noise — stays within your defined range
• Critically-damped spring smoothing for silky motion
• Per-axis control (X, Y, Z)
• Deterministic seeding for repeatable results
• All parameters animatable

Install

Download Brownian Motion.tox below and drag it into your TouchDesigner project.

Requires TouchDesigner 2023.11000+