 |
|
|
|
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 9-3-2015 9:26, Paolo Gibellini wrote:
> It seems an ancient and mysterious ship. I don't dare to imagine what
> strange kind of creatures may live (?) on it.
> ;-)
Indeed. Indeed.
--
Thomas
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
A few changes.
--
Thomas
Post a reply to this message
Attachments:
Download 'alien spaceship_01.png' (420 KB)
Preview of image 'alien spaceship_01.png'
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> Thomas de Groot <tho### [at] degroot org> wrote:
>> Aliens are reported on a daily basis, in particular on YouTube. However,
>> and invariably, they are shaky, blurred, indistinct things. Only the
>> POV-Ray telescope is able to show alien ships in all their pristine
>> splendour coming to us from deep space.
>> --
>> Thomas
>
> Hi Thomas,
>
> that is a very good start indeed, but I see some options for improvements.
> First, the structure looks great, but too many areas are lost in the shadows.
> This seems to be a general problem with space scenes, since one has only one
> light source (star) close by. May be a binary star can solve this. The orbiter
> can still have a different color in this case. The second issue is the engine
> glow. IMO it should have more turbulence at the edges. Otherwise really great.
>
> Best regards,
> Michael
>
>
I can't think of any source of turbulence in the vacuum of space.
Once the gas/plasma leave the engines *realy, realy* fast, each of it's
particles goes in a straight line, mostly indepently from the others.
Alain
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 12-3-2015 4:12, Alain wrote:
>> Thomas de Groot <tho### [at] degrootorg> wrote:
>>> Aliens are reported on a daily basis, in particular on YouTube. However,
>>> and invariably, they are shaky, blurred, indistinct things. Only the
>>> POV-Ray telescope is able to show alien ships in all their pristine
>>> splendour coming to us from deep space.
>>> --
>>> Thomas
>>
>> Hi Thomas,
>>
>> that is a very good start indeed, but I see some options for
>> improvements.
>> First, the structure looks great, but too many areas are lost in the
>> shadows.
>> This seems to be a general problem with space scenes, since one has
>> only one
>> light source (star) close by. May be a binary star can solve this. The
>> orbiter
>> can still have a different color in this case. The second issue is the
>> engine
>> glow. IMO it should have more turbulence at the edges. Otherwise
>> really great.
>>
>> Best regards,
>> Michael
>>
>>
>
> I can't think of any source of turbulence in the vacuum of space.
> Once the gas/plasma leave the engines *realy, realy* fast, each of it's
> particles goes in a straight line, mostly indepently from the others.
>
Interesting. No interaction between the particles at all? Hmmm... I
suppose that would be minimal due to the eject velocity indeed, like you
say.
So turbulence is another of those things - like wings - which we should
put in the domain of imagination :-)
--
Thomas
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
> On 12-3-2015 4:12, Alain wrote:
>>> Thomas de Groot <tho### [at] degrootorg> wrote:
>>>> Aliens are reported on a daily basis, in particular on YouTube.
>>>> However,
>>>> and invariably, they are shaky, blurred, indistinct things. Only the
>>>> POV-Ray telescope is able to show alien ships in all their pristine
>>>> splendour coming to us from deep space.
>>>> --
>>>> Thomas
>>>
>>> Hi Thomas,
>>>
>>> that is a very good start indeed, but I see some options for
>>> improvements.
>>> First, the structure looks great, but too many areas are lost in the
>>> shadows.
>>> This seems to be a general problem with space scenes, since one has
>>> only one
>>> light source (star) close by. May be a binary star can solve this. The
>>> orbiter
>>> can still have a different color in this case. The second issue is the
>>> engine
>>> glow. IMO it should have more turbulence at the edges. Otherwise
>>> really great.
>>>
>>> Best regards,
>>> Michael
>>>
>>>
>>
>> I can't think of any source of turbulence in the vacuum of space.
>> Once the gas/plasma leave the engines *realy, realy* fast, each of it's
>> particles goes in a straight line, mostly indepently from the others.
>>
>
> Interesting. No interaction between the particles at all? Hmmm... I
> suppose that would be minimal due to the eject velocity indeed, like you
> say.
>
> So turbulence is another of those things - like wings - which we should
> put in the domain of imagination :-)
I did not say "no interactions at all" but mostly independently, meaning
very little interactions.
If you looks at the jet from a rocket in the athmosphere, you'll notice
a central, often cone like and very smooth, part. It often display some
repeating pattern, like a string of beads or diamonds. It's surrounded
by a broader, more diffuse jet. On the outside of that outer layer,
where it interact with the mostly static ambient air, is where all the
turbulence is generated. As you progress farther from the engine, those
turbulences progress inward.
In space, you get the inner part forming a long and sharp cone, and the
outside part is mostly V shaped, also smooth and a lot dimer, that stay
that way as there is almost no exterior medium to interact with.
In your later image, the exaust looks like the flame of a cheap, low
presure, blow torch. In several cases, in films and TV shows, it's
exactly what they used for the "rocket engines"... I've seen some cases
whith the flame curving up for a ship going in a straight line.
If a rocket engine had an exaust like that, it would shake itself loose
and apart very shortly, or need to be so rugged that it's weight would
be excessive.
Alain
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Alain <kua### [at] videotronca> wrote:
> > On 12-3-2015 4:12, Alain wrote:
> >>> Thomas de Groot <tho### [at] degrootorg> wrote:
> >>>> Aliens are reported on a daily basis, in particular on YouTube.
> >>>> However,
> >>>> and invariably, they are shaky, blurred, indistinct things. Only the
> >>>> POV-Ray telescope is able to show alien ships in all their pristine
> >>>> splendour coming to us from deep space.
> >>>> --
> >>>> Thomas
> >>>
> >>> Hi Thomas,
> >>>
> >>> that is a very good start indeed, but I see some options for
> >>> improvements.
> >>> First, the structure looks great, but too many areas are lost in the
> >>> shadows.
> >>> This seems to be a general problem with space scenes, since one has
> >>> only one
> >>> light source (star) close by. May be a binary star can solve this. The
> >>> orbiter
> >>> can still have a different color in this case. The second issue is the
> >>> engine
> >>> glow. IMO it should have more turbulence at the edges. Otherwise
> >>> really great.
> >>>
> >>> Best regards,
> >>> Michael
> >>>
> >>>
> >>
> >> I can't think of any source of turbulence in the vacuum of space.
> >> Once the gas/plasma leave the engines *realy, realy* fast, each of it's
> >> particles goes in a straight line, mostly indepently from the others.
> >>
> >
> > Interesting. No interaction between the particles at all? Hmmm... I
> > suppose that would be minimal due to the eject velocity indeed, like you
> > say.
> >
> > So turbulence is another of those things - like wings - which we should
> > put in the domain of imagination :-)
>
> I did not say "no interactions at all" but mostly independently, meaning
> very little interactions.
> If you looks at the jet from a rocket in the athmosphere, you'll notice
> a central, often cone like and very smooth, part. It often display some
> repeating pattern, like a string of beads or diamonds. It's surrounded
> by a broader, more diffuse jet. On the outside of that outer layer,
> where it interact with the mostly static ambient air, is where all the
> turbulence is generated. As you progress farther from the engine, those
> turbulences progress inward.
> In space, you get the inner part forming a long and sharp cone, and the
> outside part is mostly V shaped, also smooth and a lot dimer, that stay
> that way as there is almost no exterior medium to interact with.
>
> In your later image, the exaust looks like the flame of a cheap, low
> presure, blow torch. In several cases, in films and TV shows, it's
> exactly what they used for the "rocket engines"... I've seen some cases
> whith the flame curving up for a ship going in a straight line.
> If a rocket engine had an exaust like that, it would shake itself loose
> and apart very shortly, or need to be so rugged that it's weight would
> be excessive.
>
>
> Alain
I would prefer a turbulence between both images.
Alain is right if the gas is emitted without obstacles from a source emitting in
some directions with a uniform distribution. But if you have obstacles, may be a
pipe of some kind (exhaust pipe), you will have interactions and so turbulence,
even in space.
Best regards,
Michael
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
Aliens came to me, too!
I am currently working on a new version of the ship, with plenty more details.
Progress and co-operation in this Facebook group:
"EC SENECA II"
Thomas de Groot <tho### [at] degrootorg> wrote:
> Aliens are reported on a daily basis, in particular on YouTube. However,
> and invariably, they are shaky, blurred, indistinct things. Only the
> POV-Ray telescope is able to show alien ships in all their pristine
> splendour coming to us from deep space.
> --
> Thomas
Post a reply to this message
Attachments:
Download 'spacecarriersmall.jpg' (201 KB)
Preview of image 'spacecarriersmall.jpg'
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 25-3-2015 18:01, Sven Littkowski wrote:
> Aliens came to me, too!
It's a plague :-)
--
Thomas
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 26/03/15 08:04, Thomas de Groot wrote:
> On 25-3-2015 18:01, Sven Littkowski wrote:
>> Aliens came to me, too!
>
> It's a plague :-)
>
I, for one, welcome our new alien overlords (as has been said many times
before)
John
--
Protect the Earth
It was not given to you by your parents
You hold it in trust for your children
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
| |
|
|
On 26-3-2015 11:27, Doctor John wrote:
> On 26/03/15 08:04, Thomas de Groot wrote:
>> On 25-3-2015 18:01, Sven Littkowski wrote:
>>> Aliens came to me, too!
>>
>> It's a plague :-)
>>
>
> I, for one, welcome our new alien overlords (as has been said many times
> before)
>
> John
>
Turncoat! Traitor to the Human race!
--
Thomas
Post a reply to this message
|
|
| |
| |
|
|
|
|
| |
|
|
