I've fixed it up a bit. I'll post the source as well. I've removed the
LightSys stuff because it gets too cluttered. I've also used my now fixed up
galaxy macro.

I would have liked to work more on my jazz scene but my home PC's
motherbaord has died...   : (

-- 
-Nekar Xenos-

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I'm not sure if this depiction of Earth's gravity is correct. Earth's
gravity increases as you get closer to it, using the usual formula.
However, once you get inside Earth's surface and start going towards its
center, the gravity decreases until at Earth's center there's zero gravity.

  OTOH, I must admit I don't know what is the common convention for
depicting a gravity well as a plane. Is the plane displaced according to
the strength of the gravity or according to the change in gravity with
respect to the surroundings?

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>  I'm not sure if this depiction of Earth's gravity is correct. Earth's
> gravity increases as you get closer to it, using the usual formula.
> However, once you get inside Earth's surface and start going towards its
> center, the gravity decreases until at Earth's center there's zero 
> gravity.
>
>  OTOH, I must admit I don't know what is the common convention for
> depicting a gravity well as a plane. Is the plane displaced according to
> the strength of the gravity or according to the change in gravity with
> respect to the surroundings?

The slope of the plane represents the force of gravity.
The increased area of the surface near the gravity well
represents the increased volume of space-time...
the height is the inverse of the increased density of
space-time (it seems more correct for gravity to point down).
Space-time is one of those things that is difficult to
visualize, it's easier to think of gravity as a force, instead
of thinking of it as an expansion of space-time.

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Nekar Xenos wrote:
> I've fixed it up a bit. I'll post the source as well. I've removed the
> LightSys stuff because it gets too cluttered. I've also used my now fixed up
> galaxy macro.

Much nicer than your first image.

Very cool. :-)

- --
William Tracy
afi### [at] gmailcom -- wtr### [at] calpolyedu

You know you've been raytracing too long when you switch to Linux
because Microsoft won't release the source code to Windows so you can
change all the buttons in your OS to use cool little raytraced images.
    -- Taps a.k.a. Tapio Vocadlo
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"Warp" <war### [at] tagpovrayorg> wrote in message 
news:4762fc3d$1@news.povray.org...
>  I'm not sure if this depiction of Earth's gravity is correct. Earth's
> gravity increases as you get closer to it, using the usual formula.
> However, once you get inside Earth's surface and start going towards its
> center, the gravity decreases until at Earth's center there's zero 
> gravity.
>
>  OTOH, I must admit I don't know what is the common convention for
> depicting a gravity well as a plane. Is the plane displaced according to
> the strength of the gravity or according to the change in gravity with
> respect to the surroundings?

The first one was on the same height. This one just looked better when I 
lowered the gravity well, so call it artistic license...  ;o)

I am not sure the actual aim here is achievable: I want it to resemble the 
POV-Ray logo (or at least a "P") be mathematically correct (of which I know 
0) and still look good.

Any help will be appreciated.


-- 
-Nekar Xenos-

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Nekar Xenos napsal(a):
> "Warp" <war### [at] tagpovrayorg> wrote in message 
> news:4762fc3d$1@news.povray.org...
>>  I'm not sure if this depiction of Earth's gravity is correct. Earth's
>> gravity increases as you get closer to it, using the usual formula.
>> However, once you get inside Earth's surface and start going towards its
>> center, the gravity decreases until at Earth's center there's zero 
>> gravity.
>>
>>  OTOH, I must admit I don't know what is the common convention for
>> depicting a gravity well as a plane. Is the plane displaced according to
>> the strength of the gravity or according to the change in gravity with
>> respect to the surroundings?
> 
> The first one was on the same height. This one just looked better when I 
> lowered the gravity well, so call it artistic license...  ;o)
> 
> I am not sure the actual aim here is achievable: I want it to resemble the 
> POV-Ray logo (or at least a "P") be mathematically correct (of which I know 
> 0) and still look good.
> 
> Any help will be appreciated.
> 
> 
try moving the light source close to the earth so its rings' left half 
is in shadow. You might need to add another light source.

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> I am not sure the actual aim here is achievable: I want it to resemble the
> POV-Ray logo (or at least a "P") be mathematically correct (of which I 
> know
> 0) and still look good.
>
> Any help will be appreciated.

Try using a shear transform to slant the gravity well,
that way it'll resemble the P from the logo more closely.

Shear_Trans(x, vnormalize(vrotate(y,<0,0,-30>)), z)

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Attachments:
Download 'Pov well 2.jpg' (68 KB)

Preview of image 'Pov well 2.jpg'

"Tim Attwood" <tim### [at] comcastnet> wrote in message 
news:4764fd6e@news.povray.org...
>> I am not sure the actual aim here is achievable: I want it to resemble 
>> the
>> POV-Ray logo (or at least a "P") be mathematically correct (of which I
>> know
>> 0) and still look good.
>>
>> Any help will be appreciated.
>
> Try using a shear transform to slant the gravity well,
> that way it'll resemble the P from the logo more closely.
>
> Shear_Trans(x, vnormalize(vrotate(y,<0,0,-30>)), z)
>
Thanks,

I tried this but in the end decided to rather rotate the plane, - I think it 
looks better. I've added polar ice and worked on the land and cloud 
textures.

I don't know if it's just my area, but it seems like South Africa's internet 
has become bottlenecked over the festive season, so I don't know if this 
will upload. Hi-speed adsl has been reduced to slower than a 56k modem...


-- 
-Nekar Xenos-

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Attachments:
Download 'Pov-well-4.jpg' (141 KB)

Preview of image 'Pov-well-4.jpg'