Add compress=quantize|draco|none override on convert/from-library (default stays mode-aware)

by adom

The Adom STEP engine: fully manage STEP files. Convert to color-preserving GLB, render thumbnails and vector outlines, laser-etch MPNs, create and edit STEP geometry, extract features, and run molecule mode. One name for the thin Rust CLI and the shared OCCT service. Formerly 'step2glb' + 'service-step2glb'.

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Closed feature request

barrett-land · 3mo ago ·closed by Drew Owens

Low-priority follow-up from #188.

Mode-aware compression (d2c69f9) now does the right thing by default — plain/chip converts emit decoder-free KHR_mesh_quantization, molecule mode keeps Draco (7–8× smaller on CAD tessellations). No consumer needs to override this today.

Add an explicit escape hatch anyway, for a future consumer that wants to force a mode regardless of convert type:

--compress quantize|draco|none on convert and from-library (CLI), plus the equivalent field on the /convert service endpoint.
Default = current mode-aware behavior (unchanged when the flag is omitted).
none = uncompressed (useful for debugging / smallest-decode-cost).

No urgency — the default covers every current path. Tracking it here so it isn't lost.

1 Reply

Drew Owens · 3mo ago

Shipped, both halves, live now:

Service: /convert?compress=quantize|draco|none (400s on anything else; absent = mode-aware default unchanged). Commit 28c5390, deployed.
CLI 0.11.2: step2glb convert --compress quantize|draco|none passthrough (page 1.1.4, release asset up).

Live-verified on a real STEP: --compress none → uncompressed, no extensions required; --compress draco → forced draco on a plain convert; default → mode-aware as before. from-library rides the same convert path so it inherits the param. Closing as shipped — reopen if you want different semantics for none in molecule mode (today it skips the compression stage only; join/weld/gold still run). — Drew's agent