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From: Mike Horvath
Subject: Saturn ring
Date: 19 Sep 2018 08:25:56
Message: <5ba20814$1@news.povray.org>
There is a texture here for Saturn's ring:

https://www.solarsystemscope.com/textures/

How do I apply this texture to a POV-Ray disc? Thanks.


Mike


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From: Le Forgeron
Subject: Re: Saturn ring
Date: 19 Sep 2018 08:55:08
Message: <5ba20eec$1@news.povray.org>
Le 19/09/2018 à 10:26, Mike Horvath a écrit :
> There is a texture here for Saturn's ring:
> 
> https://www.solarsystemscope.com/textures/
> 
> How do I apply this texture to a POV-Ray disc? Thanks.
> 
> 
> Mike

On my light side, I have uv-mapping of disc in hgpovray38, so that 
should be trivial. (probably only a problem of orienting the texture 
correctly in regard to UV axes)

On the official side, it might be a situation for the warp cylindrical.

http://wiki.povray.org/content/Reference:Warp

The dist_exp should probably be 0, as distance from the axis should be 
ignored.


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From: Mike Horvath
Subject: Re: Saturn ring
Date: 19 Sep 2018 11:21:45
Message: <5ba23149@news.povray.org>
Another question: The bitmap is long in the horizontal direction, but I 
don't know which end is supposed to be closer to the axis and which is 
supposed to be toward the outside of the ring. Any ideas?


Mike


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From: clipka
Subject: Re: Saturn ring
Date: 19 Sep 2018 11:47:06
Message: <5ba2373a$1@news.povray.org>
Am 19.09.2018 um 13:22 schrieb Mike Horvath:
> Another question: The bitmap is long in the horizontal direction, but I
> don't know which end is supposed to be closer to the axis and which is
> supposed to be toward the outside of the ring. Any ideas?

Left side of the image is the planet side.

Another question to be figured out is, what are the proper distances
from Saturn's center to the inner and outer border of the image?

My guesstimation - judging from
https://en.wikipedia.org/wiki/Rings_of_Saturn - is that the image is
supposed to represent the range from the start of the D ring (left side,
66,900 km from Saturn's center) to the F ring (right side, ~140,220 km).

Alternatively, the image may be supposed to start at the planet's
equatorial surface, 60,268 km from the center.


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From: Mike Horvath
Subject: Re: Saturn ring
Date: 22 Sep 2018 04:15:23
Message: <5ba5c1db$1@news.povray.org>
On 9/19/2018 7:47 AM, clipka wrote:
> Am 19.09.2018 um 13:22 schrieb Mike Horvath:
>> Another question: The bitmap is long in the horizontal direction, but I
>> don't know which end is supposed to be closer to the axis and which is
>> supposed to be toward the outside of the ring. Any ideas?
> 
> Left side of the image is the planet side.
> 
> Another question to be figured out is, what are the proper distances
> from Saturn's center to the inner and outer border of the image?
> 
> My guesstimation - judging from
> https://en.wikipedia.org/wiki/Rings_of_Saturn - is that the image is
> supposed to represent the range from the start of the D ring (left side,
> 66,900 km from Saturn's center) to the F ring (right side, ~140,220 km).
> 
> Alternatively, the image may be supposed to start at the planet's
> equatorial surface, 60,268 km from the center.
> 

I emailed the owner of that site but haven't gotten a response yet.


Mike


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From: Mike Horvath
Subject: Re: Saturn ring
Date: 22 Sep 2018 18:51:39
Message: <5ba68f3b@news.povray.org>
On 9/19/2018 4:55 AM, Le Forgeron wrote:
> Le 19/09/2018 à 10:26, Mike Horvath a écrit :
>> There is a texture here for Saturn's ring:
>>
>> https://www.solarsystemscope.com/textures/
>>
>> How do I apply this texture to a POV-Ray disc? Thanks.
>>
>>
>> Mike
> 
> On my light side, I have uv-mapping of disc in hgpovray38, so that 
> should be trivial. (probably only a problem of orienting the texture 
> correctly in regard to UV axes)
> 
> On the official side, it might be a situation for the warp cylindrical.
> 
> http://wiki.povray.org/content/Reference:Warp
> 
> The dist_exp should probably be 0, as distance from the axis should be 
> ignored.
> 
> 
> 
> 


The cylindrical warp is not having the desire effect. See the attachment.


Mike



pigment
{
	image_map
	{
		png "2k_saturn_ring_alpha.png"
		map_type 0
	}
	warp
	{
		cylindrical
		orientation y
		dist_exp 0
	}
}


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Attachments:
Download 'orrery_sphere_trail.png' (332 KB)

Preview of image 'orrery_sphere_trail.png'
orrery_sphere_trail.png


 

From: Mike Horvath
Subject: Re: Saturn ring
Date: 22 Sep 2018 19:02:40
Message: <5ba691d0@news.povray.org>
Disregard. I got it working.

Mike


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From: Alain
Subject: Re: Saturn ring
Date: 23 Sep 2018 03:05:10
Message: <5ba702e6@news.povray.org>
Le 18-09-22 à 15:03, Mike Horvath a écrit :
> Disregard. I got it working.
> 
> Mike

Let me guess : You rotated the image 90°


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From: Le Forgeron
Subject: Re: Saturn ring
Date: 23 Sep 2018 08:17:02
Message: <5ba74bfe@news.povray.org>
Le 22/09/2018 à 21:03, Mike Horvath a écrit :
> Disregard. I got it working.
> 
> Mike

I hope you rotated the texture in the correct direction.


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Attachments:
Download 'saturn.png' (273 KB)

Preview of image 'saturn.png'
saturn.png


 

From: Stephen
Subject: Re: Saturn ring
Date: 23 Sep 2018 08:39:59
Message: <5ba7515f$1@news.povray.org>
On 23/09/2018 09:16, Le_Forgeron wrote:
> Le 22/09/2018 à 21:03, Mike Horvath a écrit :
>> Disregard. I got it working.
>>
>> Mike
> 
> I hope you rotated the texture in the correct direction.
> 
> 

LOL
Have you been told that you are cruel, recently?


-- 

Regards
     Stephen


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