Accession Number:

ADA355158

Title:

VPF+: A Vector Product Format Extension Suitable for Three-Dimensional Modeling and Simulation

Descriptive Note:

Final rept.

Corporate Author:

NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV

Report Date:

1998-08-14

Pagination or Media Count:

60.0

Abstract:

With support from the Defense Modeling and Simulation Office and the National Imagery and Mapping Agencys NIMA Terrain Modeling Program Office, the Digital Mapping, Charting, and Geodesy Analysis Program DMAP has investigated an extension to NIMAs current Vector Product Format VPF that would benefit the Modeling and Simulation community. In its current form, VPFs winged-edge topology is documented as not being capable of modeling a wide range of three-dimensional 3D objects that may be transmitted and received through the Synthetic Environment Data Representation and Interchange Specification SEDRIS. This range of objects includes non-manifold objects found in integrated, 3D synthetic environments. DMAP therefore proposes VPF, an extension to VPF that provides for georelational modeling in 3D and that is SEDRIS capable. VPF adds a new level of topology called Level 4 Full 3D Topology Level 4. The topological information encompasses the adjacencies involved in 3D manifold and non-manifold objects, and is described using a new, extended Winged-Edge data structure. This data structure is referred to as Non-Manifold 3D Winged-Edge Topology. Level 4 also adds a new 3DObject feature class that is intended to capture a wide range of 3D objects. These features are further defined to be either Well Formed or Not Well Formed, with Well Formed 3DObject features having additional optional topological information to improve software performance. Finally, Level 4 implements no changes that alter VPFs Level 0 through Level 3 topology.

Subject Categories:

  • Computer Programming and Software
  • Operations Research

Distribution Statement:

APPROVED FOR PUBLIC RELEASE