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On 15/09/2018 11:58, Stephen wrote:
> rotate <20.000,0.000,0.000>
That might be -19 to -21 not rotate 20*x
--
Regards
Stephen
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On 9/15/2018 6:58 AM, Stephen wrote:
> On 15/09/2018 11:43, Mike Horvath wrote:
>> I have textures, but do not know how to orient them with respect to
>> the axial tilt, orbit and sun. Is anyone familiar with how to do this?
>>
>>
>> Mike
>
> For Z up Left handed scenes.
>
>
> texture {
> pigment {
> image_map{
> png "F:\Graphics\B3D Data\Maps\Planets\Earth\EarthMap2.png"
> interpolate 2
> map_type 1
> }
> rotate <20.000,0.000,0.000>
> }
>
> Then for orientation in an orbit. Rotate the sphere the planet texture
> will follow.
>
Thanks. But which direction does the axis tilt with respect to the Sun
on a given day?
Mike
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On 15/09/2018 13:11, Mike Horvath wrote:
> On 9/15/2018 6:58 AM, Stephen wrote:
>> On 15/09/2018 11:43, Mike Horvath wrote:
>>> I have textures, but do not know how to orient them with respect to
>>> the axial tilt, orbit and sun. Is anyone familiar with how to do this?
>>>
>>>
>>> Mike
>>
>> For Z up Left handed scenes.
>>
>>
>> texture {
>> pigment {
>> image_map{
>> png "F:\Graphics\B3D Data\Maps\Planets\Earth\EarthMap2.png"
>> interpolate 2
>> map_type 1
>> }
>> rotate <20.000,0.000,0.000>
>> }
>>
>> Then for orientation in an orbit. Rotate the sphere the planet texture
>> will follow.
>>
>
> Thanks. But which direction does the axis tilt with respect to the Sun
> on a given day?
>
>
Earth currently has an axial tilt of about 23.4° and the angle does not
change. With respect to the Sun on a given day, it depends on there it
is in its orbit.
https://en.wikipedia.org/wiki/Axial_tilt#Earth
So if you start your Planetarium at the summer or winter equinox. The
mechanics will take care of themselves.
I think. :)
--
Regards
Stephen
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Latest version is attached. It is *very* close, but the Earth is off by
about one month's worth of travel.
Here is the document I am using as a guide:
https://ssd.jpl.nasa.gov/txt/aprx_pos_planets.pdf
And I am using this website to compare my render to:
https://in-the-sky.org/solarsystem.php
Set it to JD 2458376.5, which is equivalent to A.D. 2018 Sep 15.
I am not sure where my calculations have gone wrong.
Mike
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Attachments:
Download 'orrery_sphere_trail_new.pov.txt' (25 KB)
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On 9/16/2018 2:31 PM, Mike Horvath wrote:
> Latest version is attached. It is *very* close, but the Earth is off by
> about one month's worth of travel.
>
> Here is the document I am using as a guide:
>
> https://ssd.jpl.nasa.gov/txt/aprx_pos_planets.pdf
>
> And I am using this website to compare my render to:
>
> https://in-the-sky.org/solarsystem.php
>
> Set it to JD 2458376.5, which is equivalent to A.D. 2018 Sep 15.
>
> I am not sure where my calculations have gone wrong.
>
>
> Mike
If you zoom out, Jupiter is also in the wrong place, so Maybe my results
are *not* so close after all.
Mike
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Updated the scene. It is working correctly now.
:)
Mike
Post a reply to this message
Attachments:
Download 'orrery_sphere_trail_b.pov.txt' (29 KB)
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