rendezvous pitch manoeuver

Post requests, images, descriptions and reports about work in progress here.
Topic author
bh
Posts: 1470
Joined: 17.12.2002
With us: 16 years 10 months
Location: Oxford, England

rendezvous pitch manoeuver

Post #1by bh » 24.03.2012, 17:37

I know it's possible to rotate an object round it's axis... can someone help with this?

http://en.wikipedia.org/wiki/Rendezvous_pitch_maneuver
regards...bh.

Avatar
selden
Developer
Posts: 10069
Joined: 04.09.2002
With us: 17 years 1 month
Location: NY, USA

Re: rendezvous pitch manoeuver

Post #2by selden » 24.03.2012, 22:28

I can think of several ways to cause an object to rotate around its pitch axis.

I believe that the pitch axis normally corresponds to a mesh's x axis in Celestia if the bow of its mesh points in Celestia's +z direction. It's the same axis that an object turns around when one specifies its Inclination in an SSC file.

One should be able to do it directly using quaternions either in a ScriptedRotation or in a pre-defined SampledOrientation.

I'd probably use UniformRotation to generate the appropriate spin of an object in Celestia.

UniformRotation causes an object (or a coordinate system) to spin around its z axis in Celestia.

One technique to make it usable would be to use a 3D design program to change the orientation of the mesh so that its pitch axis corresponds to Celestia's z axis.

A second technique might be to use the SSC Orientation directive to change the default orientation of the object.

A third technique would be to define another SSC object which is at the same position as the object to be rotated, and specify the orientation of the object to be rotated so that it is at 90 degrees with respect to that first object. Then rotate that first object.

I hope these suggestions help a little.
Selden

Topic author
bh
Posts: 1470
Joined: 17.12.2002
With us: 16 years 10 months
Location: Oxford, England

Re: rendezvous pitch manoeuver

Post #3by bh » 24.03.2012, 22:45

Selden... thanks... I'll get on it.
regards...bh.


Return to “Add-on development”

Who is online

Users browsing this forum: 14 guests