bbsolver: keyframe reduction solver

bbsolver: Fewer keys, same motion

What it is

A standalone C++ solver, and the public core of bakerBoy. It reads dense evaluated samples from a host application and writes back sparse key bundles that stay inside an error budget.

What it does

It handles scalar, vector, separated-position, motion-path and Shape Path flows, including fixed and variable topology. The normal solve path only accepts an output when the reconstructed values stay within the configured property-unit or screen-pixel tolerance. It also emits progress, diagnostics, cancellation and verification output.

Features

• Error-bounded solve (not a generic decimator), with verification output
• Spatial and temporal handling: tangents, ease, hold/linear/Bezier
• Shape Path topology handling (stable and variable)
• CLI and library (`bbsolver::bbsolver` and `bbsolver::core` CMake targets); JSON-only host contract
• Documented use cases: expression bake plus vertex optimization, rig bake and unparent, motion sketch cleanup

Capabilities

Turning sampled motion from any host (After Effects, Rive tooling, Lottie pipelines) back into editable keyframes.

Compatibility

• Prebuilt binaries: macOS Apple Silicon and Intel, Windows x64 and ARM64; builds with CMake on macOS and Windows
• Host-agnostic JSON bundles

Availability

Free, MIT licensed, public: github.com/ivg-design/bbsolver. v1.0.0 2026-05-25, v1.0.1 2026-05-28. An arXiv manuscript and reproducibility artifact exist.

Under the hood

C++ with dynamic-programming key placement, nonlinear segment fitting, oneTBB parallelism and FlatBuffers schemas.