Plugins + Scripts Thrust Response Driver

Major Improvements
Impact Trigger (recommended, enabled by default)

• Added an impact-based trigger system that gates forward response by actual physical contact
• Receiver movement is now driven by collision events, not estimated timing
• Produces a causal response chain:
  contact → impulse → inertia → settle
• Impact Trigger is enabled by default and is the recommended mode of operation

Legacy velocity-based response remains available

• The original velocity-driven system is still included
• Can be disabled or re-enabled via toggle for compatibility or alternative workflows

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Cleanup / Simplification​

The following legacy timing and rate parameters were removed, as they interfered with both response modes and caused conflicting dynamics:

• Forward Delay
• Backfall Delay
• Engage Delay
• Thrust Build Rate
• Back Build Rate
• Return Rate

These parameters introduced:

• phase lag
• double smoothing
• jitter and snap artifacts

Their removal allows the remaining physics systems to operate without internal conflict, resulting in smoother behavior even with default settings.

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Core Physics (unchanged)​

The core physical response pipeline remains intact:

• Velocity-based response system (legacy mode)
• PD controller (Position Gain / Damping Gain)
• Axis filtering and smoothing
• Speed and direction gates
• Acceleration clamping
• Max Forward / Back Offset
• Resting Offset

With redundant timing layers removed, these systems now produce more stable and predictable results.

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Preset System Improvements​

Impact Trigger state and geometry are now stored in Custom Presets

• Custom presets now save and restore:
  • Use Impact Trigger (on/off)
  • Trigger Offset Y
  • Trigger Offset Z
  • Trigger Radius
  • Trigger Height

This makes presets fully reproducible, restoring both:

• the interaction model (impact vs velocity)
• and the exact trigger placement

Built-in presets remain neutral

• Built-in presets (Soft / Medium / Strong) do not store impact-trigger state or geometry
• Custom presets are intended for pose- or scene-specific tuning

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Design Notes​

• TRD now supports two response modes:
  • Impact-triggered response (default, recommended)
  • Velocity-based response (legacy, optional)
• Both modes share the same physical response pipeline (PD + damping + clamping)

Changes in V5​

• Presets now store receiver body part selection (head, hip, chest, abdomen, thighs, feet)
• New Apply Preset workflow:
  • Preset selection is now preview-only
  • Presets are applied explicitly via Apply Preset button
• Added Timeline preset index for automation:
  • Hidden parameter for Timeline use
  • Presets can be applied directly from Timeline

Version 4 focuses on stability, UI structure, and long-term compatibility with animation and Timeline workflows.

Changes​

• Refactored plugin into a modular structure for improved stability and cleaner UI separation
• Reworked user interface layout for better usability and clarity
• Improved preset handling with a stable external JSON-based storage
• General internal cleanup and reliability improvements

Core Behavior​

• Pose-safe rework:
  Switching poses via Timeline no longer freezes or “sticks” body parts.
• Automatic recalibration:
  Receiver anchors and internal state are rebuilt automatically after pose or animation changes.
• Improved impulse timing:
  Better delayed response and follow-through, reducing premature or desynced motion.

Physics & Feel​

• More consistent rebound behavior:
  Restored and stabilized natural backfall/rebound that v1 could lose after pose switches.
• Improved stability:
  Reduced cases of static or sleeping rigidbodies; physics wakes and recovers reliably.
• Cleaner force application:
  Internal force logic simplified for more predictable, heavy-feeling motion.

Control & Workflow​

• Preset system expanded:
  • Built-in presets (Soft / Medium / Strong)
  • 5 custom preset slots for user-defined profiles
• Timeline-friendly preset switching:
  Presets can be switched instantly via Timeline using a discrete Preset Index.
• Preset Index snapping:
  Index values are fixed (no float drift), making Timeline use reliable and repeatable.

Internal Cleanup​

• Removed legacy code paths that caused state desync after animation or pose changes.
• Cleaner internal state handling and sampling reset logic.
• Better separation between preset data, runtime state, and Timeline control.

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