celestia 1.6

General discussion about Celestia that doesn't fit into other forums.
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sanctus
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Re: celestia 1.6

Post #41by sanctus » 27.08.2008, 20:39

Ohh sorry i didn't know that thank you so much,however i thought that it might be
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sanctus
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Re: celestia 1.6

Post #42by sanctus » 06.11.2008, 22:35

Do you have any news guys about the release of celestia 1.6 or what will be included in the new version?

Thanks
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t00fri
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Re: celestia 1.6

Post #43by t00fri » 06.11.2008, 23:01

sanctus wrote:Do you have any news guys about the release of celestia 1.6 or what will be included in the new version?

Thanks

http://en.wikibooks.org/wiki/Celestia/160Features

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bdm
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Re: celestia 1.6

Post #44by bdm » 07.11.2008, 00:26

I have a question in relation to triaxial ellipsoids for solar system bodies.

It specifies the following:
  • SemiAxes specified, no Radius given: body semiaxes are (sa.x, sa.y, sa.z)
  • Radius specified, no SemiAxes given: body semiaxes are (r, r, r)
  • Both SemiAxes and Radius specified: body semiaxes are (r*sa.x, r*sa.y, r*sa.z)
This specification is incomplete. If Oblateness is specified for a planet, we must remember to include it for backwards compatibility.

The second line should read:
  • Radius specified, no SemiAxes given: body semiaxes are (r, r, (1-oblateness) * r), with Oblateness = 0 if not supplied.
Assumptions:
  • Oblateness is a floating-point number that lies in the half-open interval [0, 1) and is modified (say, set to 0) if it does not lie within this range.
  • The z-axis is pole to pole and the other axes intersect the equator.
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PlutonianEmpire M
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Re: celestia 1.6

Post #45by PlutonianEmpire » 10.11.2008, 02:54

Question: Could the modify feature also be used for barycenters?
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chris
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Re: celestia 1.6

Post #46by chris » 10.11.2008, 23:11

bdm wrote:I have a question in relation to triaxial ellipsoids for solar system bodies.

It specifies the following:
  • SemiAxes specified, no Radius given: body semiaxes are (sa.x, sa.y, sa.z)
  • Radius specified, no SemiAxes given: body semiaxes are (r, r, r)
  • Both SemiAxes and Radius specified: body semiaxes are (r*sa.x, r*sa.y, r*sa.z)
This specification is incomplete. If Oblateness is specified for a planet, we must remember to include it for backwards compatibility.

The second line should read:
  • Radius specified, no SemiAxes given: body semiaxes are (r, r, (1-oblateness) * r), with Oblateness = 0 if not supplied.
Assumptions:
  • Oblateness is a floating-point number that lies in the half-open interval [0, 1) and is modified (say, set to 0) if it does not lie within this range.
  • The z-axis is pole to pole and the other axes intersect the equator.

Correct--the description of SemiAxes will be amended to include when I update the SSC properties page for 1.6.0.

--Chris
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