[brlcad-tracker] [ brlcad-Support Requests-1833702 ] Smoth arbitrary surfaces

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Support Requests item #1833702, was opened at 2007-11-17 09:18
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Category: Geometry Editing
Group: None
>Status: Closed
Resolution: Remind
Priority: 4
Private: No
Submitted By: Scott Hathcock (scottha)
Assigned to: Sean Morrison (brlcad)
Summary: Smoth arbitrary surfaces

Initial Comment:
Is there a way in mged to create a solid or hull that is a smooth surface described by a set of points or equations? 

Examples that come to mind would be using the offset points for a boat hull, or the table for an airfoil at stations along a wing.

The ars looks kind of like this but it does not appear to be smooth.


Thanks,
Scott

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>Comment By: SourceForge Robot (sf-robot)
Date: 2008-01-01 19:20

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This Tracker item was closed automatically by the system. It was
previously set to a Pending status, and the original submitter
did not respond within 14 days (the time period specified by
the administrator of this Tracker).

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Comment By: Sean Morrison (brlcad)
Date: 2007-12-18 07:42

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Scott, did you have any other questions?  Please follow-up if you need
assistance creating a BoT or if you have any developer interest in working
on implementing a skin or birail primitive.

Cheers!
Sean
 

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Comment By: Sean Morrison (brlcad)
Date: 2007-11-22 21:07

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You're quite right -- the ARS is an "arbitrary faceted solid" so it won't
appear smooth.  You could, however, create a 'bot' (bag of triangles) which
can have their normals smoothed or create an experimental NURBS object with
those points on the surface.

What it sounds like you really want, though, is an object type that we
don't yet support.  That is, you could create a solid hull surface using a
"skin" object or even with a "birail" object.  Those two primitive types
are on our wish list, but aren't presently being worked on by anyone as far
as I know.

Until those exist, the bot or ars are probably your best approach.  You
could use the flexibility of the ars and then convert that ars to a smooth
bot relatively easily. 



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