Download the plugin ZIP and SHA256SUMS.txt from the v0.1.8rc2 Pre-release. GitHub's automatic Source code archives are source snapshots. Follow the download, hash verification, extraction and SCA installation guide; SDK2.2.5 installs the extracted directory, not the ZIP. Source remains on main. Companion: physics v0.1.8rc1. This is an rc pre-release, not a stable release.
Independent SCA2.2.5 product-package exporter. Packages without saved physics can be exported without installing sca-physics. Saved metadata.sca_physics and deformable preparation require the optional, exact sca-physics==0.1.8rc1 implementation. Reads physics schemas1.0–1.8 and directly generates segments, mass/inertia, D6/endpoint joints and collision policies from saved effective values. Schema1.8 adds sourced ordinary-joint limits, force actuators, articulation parameters and ideal angular-to-linear mimic coupling. See joint actuator units and limitations, including passive/active damping combination and runtime SI target updates. Agent decisions and verified derivations are preserved; presets and segment counts are never recomputed on export. Optional input SHA256 and required-physics guards protect the selected final package. Runtime entrypoints compare installed business code with the payload before importing it. See rc2 dependency and compatibility boundaries.
Read Chinese installation and usage, automatic cables, release boundaries and historical rc1 validation. An optional bounded Isaac runtime smoke entry checks initialization/short motion, not material calibration or theoretical precision. Old rc2 strict mechanics limitations remain; accepted phase delivery is not a retroactive accuracy pass.
Use the Agent decision workflow and task runtime checker for isolated installation, saved provenance, independent export and explicit task criteria. The corresponding Pre-release notes record the actual GitHub attachment download/install verification result; local software checks alone do not establish it.
The tested candidate pair is sca-usd-export 0.1.8rc2 + sca-physics 0.1.8rc1, on Windows x86-64, CPython 3.12.15, SCA SDK 2.2.5, OpenUSD/usd-core 26.8 and OCP 7.9.3.1 (NumPy 2.3.1, Plotly 7.1.0). Geometry users only need USD; physical workflows require the exact optional peer. Prepare physics 0.1.8rc1 first, update USD, then run provision with the explicit SCA_PHYSICS_SOURCE before writing new physics assets. Updating a payload always requires reprovisioning. See the compatibility and upgrade matrix for verified inputs, commands and deployment paths.
Selected 2026-10-19 physics 0.1.0/schema 1.0 and 2026-10-20 physics 0.1.3rc1/schema 1.1 assets passed read/reload/export, as did the old path and in-memory export_package calls and JSON ExportConfig. Old bare parameters without provenance are incompatible unchanged; the tested case passes after adding truthful source information. The executable migration example is the paired physics repository's examples/pendulum/physics-input.json; preserve values and units, and provide source.kind/detail (plus real citation/conditions for reference sources), rather than inventing provenance. Earlier GitHub 9fa527b defaulted to Y-up and restitution 0; current metadata-free defaults are Z-up and 0.1. Use explicit configuration when those earlier defaults are required.
pyproject.toml separates required export dependencies, the exact optional physics extra, the full test extra, and the Hatchling build dependency. Isaac/PhysX is an external simulation environment. The tested short state roots are personal-workspace/results/arp-20261025-162555/s (standalone) and /p (paired); their add-on homes are s/a and p/a. Deep runtime paths failed dependency installation with Windows WinError206. Two external CAD-FEM fixture checks, Isaac/PhysX behavior, other environments and all historical version combinations remain unverified; static USD validation does not establish simulation behavior or precision.
Apache-2.0; provenance and preserved original history are described in NOTICE and provenance. No SCA/Isaac/PhysX binaries are distributed.