true when layerId refers to the default ViewLayer —
either literally "default" or omitted (the View treats
omission as default). This is the layer the user's primary
model content lives in; named layers carry auxiliary
content — tool overlays (TransformControls, section-plane
proxies, NavCube), user annotations, comparison snapshots,
etc.
Enumerators that list "the SceneModels the user authored" —
user-facing tab strips, source-model pickers, inspection
walkers — call isDefaultLayerModel to whitelist the
default layer. Anything in a named layer is skipped, regardless
of name.
Consumption-side only — the renderer's draw, pick, and clip
paths see every layer normally.
truewhenlayerIdrefers to the default ViewLayer — either literally"default"or omitted (the View treats omission as default). This is the layer the user's primary model content lives in; named layers carry auxiliary content — tool overlays (TransformControls, section-plane proxies, NavCube), user annotations, comparison snapshots, etc.Enumerators that list "the SceneModels the user authored" — user-facing tab strips, source-model pickers, inspection walkers — call isDefaultLayerModel to whitelist the default layer. Anything in a named layer is skipped, regardless of name.
Consumption-side only — the renderer's draw, pick, and clip paths see every layer normally.