CAD Forum - tips, tricks, discussion and utilities for AutoCAD, Inventor, Revit and other Autodesk products []
CZ | EN | DE
Login or
  Visitors: 5467

CAD tip CAD tip # 7800:

Question CAD 
 %  platform  category 
Q - question

How to model a 3D hyperboloid?

A - answer The surface of a 3D hyperboloid is a ruled surface. So use the AutoCAD command RULESURF. The control edges may be two circles or ellipses (in a polyline form), with offset (twisted) origins. Use e.g. PLINE,Arc with two 180° segments, copy the circular pline in Z axis and rotate it (e.g. 2/5 of full circle - 144°).

There are two important variables for creation of a ruled surface (model) - SURFTAB1 (surface smoothness, e.g. 24) and MESHTYPE (surface/mesh type, e.g. 0).

An example of a hyperboloid created this way can be found in the Block catalog:


Similarly, in Inventor, you can use lofting with two parallel circular paths - see the parametric IPT model:


100% *  CAD 
17.2.2011    19157×  
Prices - CAD eShop:

See also:
Tip 14072:How to import an STL, OBJ or 3DS file to an AutoCAD 3D model?
Tip 12237:UnfoldRS - unfold 3D surfaces to 2D in AutoCAD.
Tip 11726:Loading 3D models in the OBJ file format to AutoCAD.
Tip 11387:How to edit large STL files in Fusion 360?
Tip 11311:Importing STL files directly into AutoCAD - STLin.

Back   All CAD Tips

Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above). You may also add a link to your web - like this "fan" link: CAD Forum - tips, utilities, blocks for Autodesk products
CAD:    OS:    Categ: 
Text:  FAQ glossary   

Add .CIT raster format support to AutoCAD and Map and Civil 3D
CITin More info

Please use these tips at your own risk.
Arkance Systems is not responsible for possible problems that may occur as a result of using any of these tips.