pdfcraft-annot reads a page's 3D annotations and the model each shows:
the /3DD stream, or the stream a /3DRef names (at most four deep, so a
cycle ends), decoded within 256 MB and typed PRC or U3D by /Subtype.
pdfcraft-engine exposes both on Document.
The automation tool model3d_render picks a page's Nth 3D model, parses
PRC with pdfcraft-prc, assembles and frames it with pdfcraft-prc-render
from a chosen direction (default an isometric-style view, Z up), and
returns the image as a PNG. U3D gives an error until a decoder lands.
parity misc.3d-view moves to partial.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9
