Step2Glb · wasm demo

Settings

Input

STEP file Pick a .step / .stp file. It is converted entirely in your browser — nothing is uploaded.

Tessellation

Deflection1.00 mm Chordal deflection: how far a triangle may stray from the true surface. Coarser = fewer triangles, faster. Max angle25° Max chord turn angle per segment. Smaller = rounder curves, more triangles.

Output

Y-upRotate Z-up (STEP) to glTF's Y-up convention. Keep normalsPer-vertex normals (larger file). Off lets the viewer flat-shade. Exclusive with cleanup. MergedOne mesh per colour baked to world space, instead of a per-part node tree. Always in-RAM. CleanupRVM-style position weld. Welding drops normals, so this is exclusive with “keep normals”. Render resultShow the GLB in the viewer. Turn off to isolate the converter's memory footprint.

Memory

Ceiling100 MB Best-effort, not a hard cap. A file larger than this switches the hierarchical converter to streaming: the input is read from OPFS by range and each finished mesh is spilled to OPFS, instead of loading everything into RAM. What it can't stream still has to fit: the entity offset index (grows with entity count) and one part at a time — a single huge solid is tessellated whole, so it can still blow past the ceiling. Truly large files need the index itself on disk and big parts split. Disabled in merged mode (always in-RAM).

Load the sample or pick a STEP file to begin.