frame
Produces one immutable frame for the supplied viewport.
The viewport is converted to fixed constraints, including zero dimensions.
Return
the immutable core frame snapshot.
Parameters
viewport
the non-negative logical viewport.
Throws
when called from the wrong thread, reentrantly, or while the host is not attached.
when the frame pipeline or cleanup fails; the exact first failure remains primary with later distinct failures suppressed.
Produces one immutable frame with an explicit host-clock timestamp for animated nodes.
Return
immutable core frame snapshot.
Parameters
viewport
non-negative logical viewport.
time
timestamp from the owning platform clock.