QWeight
This plug-in from Tenko in Norway extends Rhinoceros with structural modeling and weight calculation. Give it a try...

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Orca3D second WIP announced
Orca3D is a marine design and analysis plug-in for Rhino from the Advanced Technology Center at DRS C3 Systems, Inc. All Rhino 4.0 users are invited to try the second Work-in-Progress (WIP) release.

Orca3D currently includes tools for hull modeling and fairing, as well as intact hydrostatics and stability, and new capabilities will continue to be added. Current features include:

• Hull Assistants, to instantly create a 3D surface model of a planing, sailboat, or ship hull. Change parameters, and watch the hull shape and hydrostatics change in real-time.
• Quick and easy creation of stations, buttocks, and waterlines, and real-time update of the curves as the hull surface is modified.
• Real-time hydrostatics, so that changes to the hull are instantly analyzed and displayed for displacement, LCB, waterplane area, and LCF.
• Special "Design" condition for hydrostatics calculations, so that complete hydrostatics can be computed with a single button click.
• Complete intact Hydrostatics and Stability calculations, at various combinations of:
  • Displacement or Flotation Plane Height
  • LCG or Trim Angle
  • TCG or Heel Angle
  • Range of Heel Angles for Righting Arm calculations
• Output via Microsoft Report Viewer, allowing direct printing of reports or export to Excel or Adobe Acrobat, as well as user-customizable formatting.
• Corner continuity command, to ensure curvature continuity around the forefoot
• One-button click to create a 3-view Lines Plan
• Export of section curves to IDF or PIAS formats
• Hierarchical Layer Tree control, showing the objects in each of the layers

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If not, check out these "What's new in 4.0" videos.

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