A vertex has a passport.

Compare traversal-oriented OBJ with attribute-rich PLY and surface-only STL. Export deterministic geometry, reload it through the real loaders, and make world-space transforms, flattening, endianness, indexing, and format loss explicit.

export request

WAITING

mode / bytes

—

source vertices

—

reload vertices

—

triangles / indexed

—

attributes

—

source / reload bounds

—

custom / colors

—

sample

NOT RUN

ROUND-TRIP / WAITINGFORMAT / —

OBJ preserves world-space vertices, UVs, normals, lines, and points but no material files; PLY preserves selected vertex attributes but no textures; STL preserves surface triangles as non-indexed geometry without scene or material metadata. This is a partial interchange contract; whole-example fidelity remains separate.

Sources: OBJExporter · OBJLoader · PLYExporter · PLYLoader · STLExporter · STLLoader · official PLY example