A source model: STL bytes, 3MF bytes, or a pre-built ModelScene. This concrete union is the
backward-compatible still-render input; it flows through the shared open-kind loader registry
(ModelSourceInput, DD-021 §4.1), so any registered kind is also accepted.
A source model: STL bytes, 3MF bytes, or a pre-built
ModelScene. This concrete union is the backward-compatible still-render input; it flows through the shared open-kindloader registry (ModelSourceInput, DD-021 §4.1), so any registeredkindis also accepted.