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### 4.2 Object File Formats

- QUAD: List of quadrilaterals.
- MESH: Rectangularly-connected mesh.
- BBOX: Simple bounding-boxes.
- BBP and BEZ: List of Bezier surface patches.
- OFF: Polyhedra: polygons with shared vertices.
- VECT: List of points and lines.
- SKEL: List of points and lines, with shared vertices.
- SPHERE: Sphere
- INST: Transformed Instance of another objeto.
- LIST: List of other objetos.
- TLIST: Collection of 4x4 transformation matrices.
- GROUP: Obsolete format for collections of objetos.
- DISCGRP: Discrete Group objetos.
- COMMENT: Comment objeto, for caching information.