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10 Oct 2026 18:31:08 EDT (-0400)
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From: Mike Horvath
Subject: Colony ship
Date: 5 Jan 2016 23:31:20
Message: <568c9898@news.povray.org>
I decided to dust off this old scene and work on a few more bits.

I finalized how the docking bay and engine are going to be laid out, and 
I am happy with them.

I also split the habitation area into two counter-rotating sections. I'm 
thinking of making the end caps concave, like the bottom of a soda can.

A note about the cone in front. It's supposed to be a mesh of copper or 
gold wires that are electrically charged to keep dust from coming in 
contact with the ship. Kind of the opposite of a solar sail. I need to 
work on the wires a bit more to make them apparent.

Enjoy!


Mike


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From: Stephen
Subject: Re: Colony ship
Date: 6 Jan 2016 09:03:22
Message: <568d1eaa$1@news.povray.org>
On 1/6/2016 4:31 AM, Mike Horvath wrote:
> A note about the cone in front. It's supposed to be a mesh of copper or
> gold wires that are electrically charged to keep dust from coming in
> contact with the ship. Kind of the opposite of a solar sail. I need to
> work on the wires a bit more to make them apparent.


I don't know. I like the effect you have now.

-- 

Regards
     Stephen


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From: Sven Littkowski
Subject: Re: Colony ship
Date: 6 Jan 2016 12:27:54
Message: <568d4e9a$1@news.povray.org>
Your project is promising, please continue with it and keep us updated. :-)


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From: Mike Horvath
Subject: Re: Colony ship
Date: 6 Jan 2016 13:50:01
Message: <568d61d9$1@news.povray.org>
Another thing I worry about is the weak spine of the ship. I need to 
create struts around the circumference of the ship so the ship does not 
break in half when applying thrust! Aircraft and spacecraft IRL tend not 
to have spines, but rather a hollow frame.


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From: Alain
Subject: Re: Colony ship
Date: 6 Jan 2016 16:05:11
Message: <568d8187$1@news.povray.org>
Le 16-01-05 23:31, Mike Horvath a écrit :
> I decided to dust off this old scene and work on a few more bits.
>
> I finalized how the docking bay and engine are going to be laid out, and
> I am happy with them.
>
> I also split the habitation area into two counter-rotating sections. I'm
> thinking of making the end caps concave, like the bottom of a soda can.
>
> A note about the cone in front. It's supposed to be a mesh of copper or
> gold wires that are electrically charged to keep dust from coming in
> contact with the ship. Kind of the opposite of a solar sail. I need to
> work on the wires a bit more to make them apparent.
>
> Enjoy!
>
>
> Mike

Given the size of that ship, the wires won't be individualy visible 
unless they are very thick, like around 1m thick...

The part of the spine inside the living section is OK as it don't seem 
to have a real structural function. But, going aft, it does indeed look 
flimsy.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 7 Jan 2016 05:25:37
Message: <568e3d21@news.povray.org>
Several changes.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 9 Jan 2016 18:38:57
Message: <56919a11@news.povray.org>
I decided to use an array of spheres for the spiral lamp light instead 
of a single object since it's a lot easier to control.

I also tweaked the parabolic nose shield. I am very unhappy with the 
texture however. It's supposed to simulate a wire mesh, not a solid 
surface, but I don't think it's working. Here is the texture:

#declare thin_wire_material = material
{
	#switch (TexQual)
		#case (-1)
			texture {lowqual_pig(Seed)}
		#break
		#case (0)
			texture {pigment {gamma_color_adjust(<0.70, 0.25, 0.15, 0.00, 0.90>)}}
		#break
		#case (1)
		#case (2)
			// needs an interior too I think
			texture
			{
				pigment {gamma_color_adjust(<0.70, 0.25, 0.15, 0.00, 0.90>)}
				finish
				{
				    ambient		0.15
				    brilliance	5
				    diffuse		0.6
				    metallic
				    specular	0.80
				    roughness	1/100
				    reflection	0.65
				}
			}
		#break


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From: clipka
Subject: Re: Colony ship
Date: 9 Jan 2016 19:08:00
Message: <5691a0e0$1@news.povray.org>
Am 10.01.2016 um 00:38 schrieb Mike Horvath:

> I also tweaked the parabolic nose shield. I am very unhappy with the
> texture however. It's supposed to simulate a wire mesh, not a solid
> surface, but I don't think it's working. Here is the texture:

No that indeed doesn't work at all.

You'll want "micronormals", i.e. some "normal {...}" statement with a
pattern scaled so small that it is no longer visible in the image.

Ideally the structure of the pattern should match the structure of
whatever material you intend to simulate.

Make sure you don't get moiree effects from it though; anti-aliasing
might do the trick, otherwise I'd recommend using a tiny bit of focal
blur, or use UberPOV's anti-aliasing mode 3. Or you might just choose a
random pattern, which won't be as close to the real deal but will not
cause any moiree at all.

Speaking of UberPOV, if you go down that route another alternative would
be to just use highly blurred reflections.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 9 Jan 2016 19:48:06
Message: <5691aa46@news.povray.org>
On 1/9/2016 7:07 PM, clipka wrote:
> Am 10.01.2016 um 00:38 schrieb Mike Horvath:
>
>> I also tweaked the parabolic nose shield. I am very unhappy with the
>> texture however. It's supposed to simulate a wire mesh, not a solid
>> surface, but I don't think it's working. Here is the texture:
>
> No that indeed doesn't work at all.
>
> You'll want "micronormals", i.e. some "normal {...}" statement with a
> pattern scaled so small that it is no longer visible in the image.
>
> Ideally the structure of the pattern should match the structure of
> whatever material you intend to simulate.
>
> Make sure you don't get moiree effects from it though; anti-aliasing
> might do the trick, otherwise I'd recommend using a tiny bit of focal
> blur, or use UberPOV's anti-aliasing mode 3. Or you might just choose a
> random pattern, which won't be as close to the real deal but will not
> cause any moiree at all.
>
> Speaking of UberPOV, if you go down that route another alternative would
> be to just use highly blurred reflections.
>


How would I create the pattern? The radial part is easy, but how do I 
get the ribbed portion? Which function do I use?

f_paraboloid(x,y,z, P0)

Or something else?


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From: Mike Horvath
Subject: Re: Colony ship
Date: 9 Jan 2016 19:50:59
Message: <5691aaf3$1@news.povray.org>
On 1/9/2016 7:07 PM, clipka wrote:
> Am 10.01.2016 um 00:38 schrieb Mike Horvath:
>
>> I also tweaked the parabolic nose shield. I am very unhappy with the
>> texture however. It's supposed to simulate a wire mesh, not a solid
>> surface, but I don't think it's working. Here is the texture:
>
> No that indeed doesn't work at all.
>
> You'll want "micronormals", i.e. some "normal {...}" statement with a
> pattern scaled so small that it is no longer visible in the image.
>
> Ideally the structure of the pattern should match the structure of
> whatever material you intend to simulate.
>
> Make sure you don't get moiree effects from it though; anti-aliasing
> might do the trick, otherwise I'd recommend using a tiny bit of focal
> blur, or use UberPOV's anti-aliasing mode 3. Or you might just choose a
> random pattern, which won't be as close to the real deal but will not
> cause any moiree at all.
>
> Speaking of UberPOV, if you go down that route another alternative would
> be to just use highly blurred reflections.
>


I guess I should clarify that what you see in that last image is not a 
texture, but a physical array of cylinders and tori. Replacing them with 
a proper texture would make the scene render much faster as well.


Mike


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From: clipka
Subject: Re: Colony ship
Date: 9 Jan 2016 20:48:21
Message: <5691b865$1@news.povray.org>
Am 10.01.2016 um 01:51 schrieb Mike Horvath:

> I guess I should clarify that what you see in that last image is not a
> texture, but a physical array of cylinders and tori. Replacing them with
> a proper texture would make the scene render much faster as well.

Ah, I guess we have a misunderstanding there. I thought you wanted the
semi-transparent paraboloid sheet to look more like a fine mesh, but now
my understanding is that it is the visible support structure of that
paraboloid that you want to look more like a mesh.

Well, my guess there is that it doesn't look like wires because they're
not really the size of wires, and also because the "longitudinal" and
"latitudinal" structures simply intersect. Maybe if they just touched
each other, possibly in an alternating "weaving" fashion, and maybe
connected with some "clamps", it might look better.


Also I wouldn't use copper. It's expensive, heavy, and you only need it
if there are high currents involved. Presuming the shield is primarily
based on static voltage, metals with higher resistance should work just
as fine.

Aluminum might make for a great alternative, too.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 9 Jan 2016 22:50:56
Message: <5691d520$1@news.povray.org>
On 1/9/2016 8:47 PM, clipka wrote:
> Am 10.01.2016 um 01:51 schrieb Mike Horvath:
>
>> I guess I should clarify that what you see in that last image is not a
>> texture, but a physical array of cylinders and tori. Replacing them with
>> a proper texture would make the scene render much faster as well.
>
> Ah, I guess we have a misunderstanding there. I thought you wanted the
> semi-transparent paraboloid sheet to look more like a fine mesh, but now
> my understanding is that it is the visible support structure of that
> paraboloid that you want to look more like a mesh.
>
> Well, my guess there is that it doesn't look like wires because they're
> not really the size of wires, and also because the "longitudinal" and
> "latitudinal" structures simply intersect. Maybe if they just touched
> each other, possibly in an alternating "weaving" fashion, and maybe
> connected with some "clamps", it might look better.
>
>
> Also I wouldn't use copper. It's expensive, heavy, and you only need it
> if there are high currents involved. Presuming the shield is primarily
> based on static voltage, metals with higher resistance should work just
> as fine.
>
> Aluminum might make for a great alternative, too.
>

No, you were right. I want to make the paraboloid sheet to look like a 
mesh. The solid ribs take too long to render.

I will also switch the material to look the same as the engine nozzle.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 10 Jan 2016 00:15:35
Message: <5691e8f7@news.povray.org>
On 1/9/2016 8:47 PM, clipka wrote:
> Am 10.01.2016 um 01:51 schrieb Mike Horvath:
>
>> I guess I should clarify that what you see in that last image is not a
>> texture, but a physical array of cylinders and tori. Replacing them with
>> a proper texture would make the scene render much faster as well.
>
> Ah, I guess we have a misunderstanding there. I thought you wanted the
> semi-transparent paraboloid sheet to look more like a fine mesh, but now
> my understanding is that it is the visible support structure of that
> paraboloid that you want to look more like a mesh.
>
> Well, my guess there is that it doesn't look like wires because they're
> not really the size of wires, and also because the "longitudinal" and
> "latitudinal" structures simply intersect. Maybe if they just touched
> each other, possibly in an alternating "weaving" fashion, and maybe
> connected with some "clamps", it might look better.
>
>
> Also I wouldn't use copper. It's expensive, heavy, and you only need it
> if there are high currents involved. Presuming the shield is primarily
> based on static voltage, metals with higher resistance should work just
> as fine.
>
> Aluminum might make for a great alternative, too.
>


Here's the code I use for the paraboloid, by the way. Whatever i end up 
doing, it has to match up with that.

#local glass_cone = difference
{
	object
	{
		Paraboloid_Z
		scale nose_cone_radius
		translate -z * ext_glass_thick/2
	}
	object
	{
		Paraboloid_Z
		scale nose_cone_radius
		translate +z * ext_glass_thick/2
	}
}


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From: Mike Horvath
Subject: Re: Colony ship
Date: 11 Jan 2016 17:49:42
Message: <56943186@news.povray.org>
On 1/5/2016 11:31 PM, Mike Horvath wrote:
> I decided to dust off this old scene and work on a few more bits.
>
> I finalized how the docking bay and engine are going to be laid out, and
> I am happy with them.
>
> I also split the habitation area into two counter-rotating sections. I'm
> thinking of making the end caps concave, like the bottom of a soda can.
>
> A note about the cone in front. It's supposed to be a mesh of copper or
> gold wires that are electrically charged to keep dust from coming in
> contact with the ship. Kind of the opposite of a solar sail. I need to
> work on the wires a bit more to make them apparent.
>
> Enjoy!
>
>
> Mike

I changed the texture of the nose cone. I'm pretty happy with it. I 
think I got all the things done on my checklist. I will put the project 
back on the shelf until some later time when I come up with new ideas. 
For now I am done.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 11 Jan 2016 19:29:40
Message: <569448f4$1@news.povray.org>
On 1/11/2016 5:49 PM, Mike Horvath wrote:
> I changed the texture of the nose cone. I'm pretty happy with it. I
> think I got all the things done on my checklist. I will put the project
> back on the shelf until some later time when I come up with new ideas.
> For now I am done.
>
>
> Mike

I created a youtube video showing how the model has changed over time.

https://www.youtube.com/watch?v=ajeZkwBuzIU

Enjoy!


Mike


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From: Dick Balaska
Subject: Re: Colony ship
Date: 12 Jan 2016 09:57:21
Message: <MPG.30fede481e62b2eb989697@news.povray.org>
In article <569448f4$1@news.povray.org>, mik### [at] gmailcom says...
> 
> I created a youtube video showing how the model has changed over time.
> 
> https://www.youtube.com/watch?v=ajeZkwBuzIU
> 
> Enjoy!

Very cool.  I like the first generation where the solar panels circle 
the ship, at 0:53.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 12 Jan 2016 15:04:45
Message: <56955c5d$1@news.povray.org>
On 1/9/2016 10:51 PM, Mike Horvath wrote:
> No, you were right. I want to make the paraboloid sheet to look like a
> mesh. The solid ribs take too long to render.
>
> I will also switch the material to look the same as the engine nozzle.
>
>
> Mike


I tried creating a texture, and while it does look good, it is actually 
slower to render than creating the 3D cylindrical ribs.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 13 Jan 2016 20:11:52
Message: <5696f5d8$1@news.povray.org>
On 1/11/2016 5:49 PM, Mike Horvath wrote:
> On 1/5/2016 11:31 PM, Mike Horvath wrote:
>> I decided to dust off this old scene and work on a few more bits.
>>
>> I finalized how the docking bay and engine are going to be laid out, and
>> I am happy with them.
>>
>> I also split the habitation area into two counter-rotating sections. I'm
>> thinking of making the end caps concave, like the bottom of a soda can.
>>
>> A note about the cone in front. It's supposed to be a mesh of copper or
>> gold wires that are electrically charged to keep dust from coming in
>> contact with the ship. Kind of the opposite of a solar sail. I need to
>> work on the wires a bit more to make them apparent.
>>
>> Enjoy!
>>
>>
>> Mike
>
> I changed the texture of the nose cone. I'm pretty happy with it. I
> think I got all the things done on my checklist. I will put the project
> back on the shelf until some later time when I come up with new ideas.
> For now I am done.
>
>
> Mike


Do the fuel tanks in back of the space craft appear too small? I was 
aiming for nuclear propulsion, but might switch to something else.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 16 Jan 2016 14:05:58
Message: <569a9496@news.povray.org>
Just got done rendering the attached image. It took 15 hours, and I 
haven't even enabled finishes or interiors yet. :(


Mike


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From: Alain
Subject: Re: Colony ship
Date: 16 Jan 2016 14:35:19
Message: <569a9b77@news.povray.org>
Le 16-01-16 14:06, Mike Horvath a écrit :
> Just got done rendering the attached image. It took 15 hours, and I
> haven't even enabled finishes or interiors yet. :(
>
>
> Mike

I have a rendering that racked about 800 times as much and is currently 
just over 50% done...

Ok, it have multiple imbedded spheres and use blured reflection, 
refraction, dispersion, photons, irid,...
I get a *LOT* of total internal reflections in those spheres.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 16 Jan 2016 18:59:30
Message: <569ad962$1@news.povray.org>
On 1/16/2016 2:35 PM, Alain wrote:
> Le 16-01-16 14:06, Mike Horvath a écrit :
>> Just got done rendering the attached image. It took 15 hours, and I
>> haven't even enabled finishes or interiors yet. :(
>>
>>
>> Mike
>
> I have a rendering that racked about 800 times as much and is currently
> just over 50% done...
>
> Ok, it have multiple imbedded spheres and use blured reflection,
> refraction, dispersion, photons, irid,...
> I get a *LOT* of total internal reflections in those spheres.

I don't have the patience to wait *that* long. Maybe if I had a second 
computer dedicated to POV-Ray. But I doubt it.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 18 Jan 2016 20:48:36
Message: <569d95f4@news.povray.org>
Here's my latest (incomplete) render. However, I don't understand why 
the planet in the background is so bright compared to the last render. 
Can anyone explain this? Is it the area light causing this or the 
reflections? I'm using the same area light as in the last render and I 
don't understand why the planet appears to be extra lit. Thanks.


Mike


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From: dick balaska
Subject: Re: Colony ship
Date: 18 Jan 2016 21:30:44
Message: <569d9fd4@news.povray.org>
On 1/18/2016 8:48 PM, Mike Horvath wrote:
> Here's my latest (incomplete) render. However, I don't understand why
> the planet in the background is so bright compared to the last render.
> Can anyone explain this? Is it the area light causing this or the
> reflections? I'm using the same area light as in the last render and I
> don't understand why the planet appears to be extra lit. Thanks.

The preview window may not accurately reflect what's in the image file. 
  Strange but true.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 19 Jan 2016 01:25:30
Message: <569dd6da$1@news.povray.org>
On 1/18/2016 9:30 PM, dick balaska wrote:
> On 1/18/2016 8:48 PM, Mike Horvath wrote:
>> Here's my latest (incomplete) render. However, I don't understand why
>> the planet in the background is so bright compared to the last render.
>> Can anyone explain this? Is it the area light causing this or the
>> reflections? I'm using the same area light as in the last render and I
>> don't understand why the planet appears to be extra lit. Thanks.
>
> The preview window may not accurately reflect what's in the image file.
>   Strange but true.
>
>

None of the other objects in the scene appear brighter. It's just the 
planet as seen through the window.


Mike


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From: clipka
Subject: Re: Colony ship
Date: 19 Jan 2016 11:08:19
Message: <569e5f73$1@news.povray.org>
Am 19.01.2016 um 02:48 schrieb Mike Horvath:
> Here's my latest (incomplete) render. However, I don't understand why
> the planet in the background is so bright compared to the last render.
> Can anyone explain this? Is it the area light causing this or the
> reflections? I'm using the same area light as in the last render and I
> don't understand why the planet appears to be extra lit. Thanks.

Did you make sure that the light properly falls off with distance?


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From: Mike Horvath
Subject: Re: Colony ship
Date: 19 Jan 2016 13:31:49
Message: <569e8115$1@news.povray.org>
On 1/19/2016 11:08 AM, clipka wrote:
> Am 19.01.2016 um 02:48 schrieb Mike Horvath:
>> Here's my latest (incomplete) render. However, I don't understand why
>> the planet in the background is so bright compared to the last render.
>> Can anyone explain this? Is it the area light causing this or the
>> reflections? I'm using the same area light as in the last render and I
>> don't understand why the planet appears to be extra lit. Thanks.
>
> Did you make sure that the light properly falls off with distance?
>

No, I didn't. But wouldn't that be noticeable in both images? In the 
previous image the planet looked okay. I am using the same light source 
in both.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 24 Jan 2016 19:17:35
Message: <56a5699f@news.povray.org>
Here's the latest render from inside the ship. Way too much glare! I 
will explore ways to reduce the glare but I'm not sure what will be 
effective.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 24 Jan 2016 21:27:20
Message: <56a58808$1@news.povray.org>
On 1/19/2016 11:08 AM, clipka wrote:
> Am 19.01.2016 um 02:48 schrieb Mike Horvath:
>> Here's my latest (incomplete) render. However, I don't understand why
>> the planet in the background is so bright compared to the last render.
>> Can anyone explain this? Is it the area light causing this or the
>> reflections? I'm using the same area light as in the last render and I
>> don't understand why the planet appears to be extra lit. Thanks.
>
> Did you make sure that the light properly falls off with distance?
>

What values would you recommend? It is a linear area light.


Mike


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From: Sven Littkowski
Subject: Re: Colony ship
Date: 25 Jan 2016 04:01:46
Message: <56a5e47a$1@news.povray.org>
Nice inside landscaping. Shouldn't all building be of the same shape, in
regards to ensure all over the cylinder is the same mass distribution?
Otherwise, mass unbalance might cause problems while spinning. I don't
mean the shape of buildings from back to front, but beside each other.


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From: Sven Littkowski
Subject: Re: Colony ship
Date: 25 Jan 2016 04:02:32
Message: <56a5e4a8$1@news.povray.org>
How did you make the trees? I could use that technology for some of my
scenes, too. :-)


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From: Thomas de Groot
Subject: Re: Colony ship
Date: 25 Jan 2016 07:38:28
Message: <56a61744$1@news.povray.org>
On 25-1-2016 10:02, Sven Littkowski wrote:
> How did you make the trees? I could use that technology for some of my
> scenes, too. :-)
>

Looks like POV-Tree...

-- 
Thomas


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From: Thomas de Groot
Subject: Re: Colony ship
Date: 25 Jan 2016 07:44:08
Message: <56a61898$1@news.povray.org>
On 25-1-2016 10:02, Sven Littkowski wrote:
> How did you make the trees? I could use that technology for some of my
> scenes, too. :-)
>

Looks like POV-Tree:

http://web.archive.org/web/20071101052625/propro.ru/go/Wshop/povtree/download.html

-- 
Thomas


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From: clipka
Subject: Re: Colony ship
Date: 25 Jan 2016 09:05:01
Message: <web.56a62b09ed6e77c8ad6fa18f0@news.povray.org>
Mike Horvath <mik### [at] gmailcom> wrote:
> On 1/19/2016 11:08 AM, clipka wrote:
> > Am 19.01.2016 um 02:48 schrieb Mike Horvath:
> >> Here's my latest (incomplete) render. However, I don't understand why
> >> the planet in the background is so bright compared to the last render.
> >> Can anyone explain this? Is it the area light causing this or the
> >> reflections? I'm using the same area light as in the last render and I
> >> don't understand why the planet appears to be extra lit. Thanks.
> >
> > Did you make sure that the light properly falls off with distance?
> >
>
> What values would you recommend? It is a linear area light.

Presuming the area light is supposed to simulate a structure somewhat akin to a
long cylinder, I would set fade_distance to the radius of that structure; to get
the proper behaviour along the length of the area light, I would suggest using
area_illumination.

For realism, fade_power should always be 2. Note that you may have to
significantly increase the light source's brightness.


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From: Alain
Subject: Re: Colony ship
Date: 25 Jan 2016 14:26:40
Message: <56a676f0$1@news.povray.org>
Le 16-01-25 04:01, Sven Littkowski a écrit :
> Nice inside landscaping. Shouldn't all building be of the same shape, in
> regards to ensure all over the cylinder is the same mass distribution?
> Otherwise, mass unbalance might cause problems while spinning. I don't
> mean the shape of buildings from back to front, but beside each other.
>

You just need the building to be similar across the axis. Side by side, 
it don't mather.
Also, you can have a small building containing huigh mass cargo, and 
large ones used by peoples that have about the same overall mass.
Finaly, there is probably a network of balast "underground" to help 
balancing the whole thing.



Alain


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From: Mike Horvath
Subject: Re: Colony ship
Date: 25 Jan 2016 14:50:51
Message: <56a67c9b$1@news.povray.org>
On 1/25/2016 4:01 AM, Sven Littkowski wrote:
> Nice inside landscaping. Shouldn't all building be of the same shape, in
> regards to ensure all over the cylinder is the same mass distribution?
> Otherwise, mass unbalance might cause problems while spinning. I don't
> mean the shape of buildings from back to front, but beside each other.
>

I think the scene would look less interesting if the buildings are the 
same. Anyway, if I were to make changes, I would go in the *other* 
direction. I.e. make the scene look even *more* organic.


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 25 Jan 2016 14:52:28
Message: <56a67cfc$1@news.povray.org>
On 1/25/2016 9:02 AM, clipka wrote:
> Presuming the area light is supposed to simulate a structure somewhat akin to a
> long cylinder, I would set fade_distance to the radius of that structure; to get
> the proper behaviour along the length of the area light, I would suggest using
> area_illumination.

I experimented with fade_distance by setting it to the radius of the 
lamp object, but it makes the scene too dark.


>
> For realism, fade_power should always be 2. Note that you may have to
> significantly increase the light source's brightness.
>
>

Good tip, thanks.



Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 25 Jan 2016 14:57:19
Message: <56a67e1f$1@news.povray.org>
On 1/25/2016 4:02 AM, Sven Littkowski wrote:
> How did you make the trees? I could use that technology for some of my
> scenes, too. :-)
>

It may be TomTree.

http://tkgate.sourcearchive.com/documentation/2.0~b8/TOMTREE_8inc-source.html

I don't recall for sure.


Mike


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From: Cousin Ricky
Subject: Re: Colony ship
Date: 25 Jan 2016 15:25:00
Message: <web.56a6837ded6e77c8566b73360@news.povray.org>
Mike Horvath <mik### [at] gmailcom> wrote:
> On 1/25/2016 9:02 AM, clipka wrote:
> > Presuming the area light is supposed to simulate a structure somewhat akin to a
> > long cylinder, I would set fade_distance to the radius of that structure; to get
> > the proper behaviour along the length of the area light, I would suggest using
> > area_illumination.
>
> I experimented with fade_distance by setting it to the radius of the
> lamp object, but it makes the scene too dark.
>
> > For realism, fade_power should always be 2. Note that you may have to
> > significantly increase the light source's brightness.

Multiply the light source's color by (1 + pow (D / R, 2)) / 2, where R is the
fade_distance, and D is the radius of the colony interior.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 25 Jan 2016 17:10:51
Message: <56a69d6b$1@news.povray.org>
Question: Should the density of the gas in the habitat area be 
significantly lower around the central axis than toward the outer edges 
of the cylinder? Or is it safe to ignore such a gradient?


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 25 Jan 2016 17:18:04
Message: <56a69f1c$1@news.povray.org>
On 1/25/2016 3:20 PM, Cousin Ricky wrote:
> Mike Horvath <mik### [at] gmailcom> wrote:
>> On 1/25/2016 9:02 AM, clipka wrote:
>>> Presuming the area light is supposed to simulate a structure somewhat akin to a
>>> long cylinder, I would set fade_distance to the radius of that structure; to get
>>> the proper behaviour along the length of the area light, I would suggest using
>>> area_illumination.
>>
>> I experimented with fade_distance by setting it to the radius of the
>> lamp object, but it makes the scene too dark.
>>
>>> For realism, fade_power should always be 2. Note that you may have to
>>> significantly increase the light source's brightness.
>
> Multiply the light source's color by (1 + pow (D / R, 2)) / 2, where R is the
> fade_distance, and D is the radius of the colony interior.
>
>


That worked, thank you!


Mike


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From: Stephen
Subject: Re: Colony ship
Date: 25 Jan 2016 17:28:31
Message: <56a6a18f$1@news.povray.org>
On 1/25/2016 7:27 PM, Alain wrote:
> Finaly, there is probably a network of balast "underground" to help
> balancing the whole thing.

I would say more than probably. On ships and semi-submersible oil rigs. 
The balast has to be adjusted whenever the cargo changes.

-- 

Regards
     Stephen


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From: clipka
Subject: Re: Colony ship
Date: 25 Jan 2016 17:31:43
Message: <56a6a24f$1@news.povray.org>
Am 25.01.2016 um 23:11 schrieb Mike Horvath:
> Question: Should the density of the gas in the habitat area be
> significantly lower around the central axis than toward the outer edges
> of the cylinder? Or is it safe to ignore such a gradient?

Given the comparatively small size of the habitat, it should be negligible.

Presuming both artificial gravitation and ground level air pressure to
be similar to conditions on Earth, you'd also get a somewhat similar
atmospheric density gradient. (It would even be less pronounced than on
Earth, as the artificial gravitation would fall off much faster with
increase in height above ground.)


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From: Mike Horvath
Subject: Re: Colony ship
Date: 26 Jan 2016 03:34:33
Message: <56a72f99$1@news.povray.org>
On 1/24/2016 7:17 PM, Mike Horvath wrote:
> Here's the latest render from inside the ship. Way too much glare! I
> will explore ways to reduce the glare but I'm not sure what will be
> effective.
>
>
> Mike


I forgot to add that this image took about a week to render. I just 
turned on interior media and radiosity and it is rendering at 13ppm (and 
will probably drop lower at certain spots). So I estimate it will take 
between 1 and 2 months nonstop to fully render.

:(

AMD A8-5600K Trinity Quad-Core 3.6GHz


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From: clipka
Subject: Re: Colony ship
Date: 26 Jan 2016 03:49:25
Message: <56a73315$1@news.povray.org>
Am 26.01.2016 um 09:34 schrieb Mike Horvath:

> I forgot to add that this image took about a week to render.

You might want to examine whether you're doing something wrong.

While high quality settings are an obvious factor in long renders,
another infamous but often underestimated performance hog is complex
non-union CSG.


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From: Mike Horvath
Subject: Re: Colony ship
Date: 26 Jan 2016 04:51:03
Message: <56a74187$1@news.povray.org>
On 1/26/2016 3:49 AM, clipka wrote:
> Am 26.01.2016 um 09:34 schrieb Mike Horvath:
>
>> I forgot to add that this image took about a week to render.
>
> You might want to examine whether you're doing something wrong.
>
> While high quality settings are an obvious factor in long renders,
> another infamous but often underestimated performance hog is complex
> non-union CSG.
>

I added a lot of bounded_by statements to the city objects previously. 
If you want to take a look for yourself, you can download the scene here:

http://www.mediafire.com/download/ccp3kv21k3oldvl/GH_LoadingScreen_src_v2_6_0.zip

The file to render is called "gh_scene_spinner_cutaway_e.pov".


Mike


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From: Mike Horvath
Subject: Re: Colony ship
Date: 26 Jan 2016 21:26:58
Message: <56a82af2$1@news.povray.org>
On 1/26/2016 3:34 AM, Mike Horvath wrote:
> On 1/24/2016 7:17 PM, Mike Horvath wrote:
>> Here's the latest render from inside the ship. Way too much glare! I
>> will explore ways to reduce the glare but I'm not sure what will be
>> effective.
>>
>>
>> Mike
>
>
> I forgot to add that this image took about a week to render. I just
> turned on interior media and radiosity and it is rendering at 13ppm (and
> will probably drop lower at certain spots). So I estimate it will take
> between 1 and 2 months nonstop to fully render.
>
> :(
>
> AMD A8-5600K Trinity Quad-Core 3.6GHz
>

The render speed has actually improved to 75ppm. I am 17 hours into the 
render and am at 8% completion of the 1280x720px image! Yay!


Mike


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From: Sven Littkowski
Subject: Re: Colony ship
Date: 27 Jan 2016 06:29:31
Message: <56a8aa1b@news.povray.org>
Thanks! :-D


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From: Sven Littkowski
Subject: Re: Colony ship
Date: 27 Jan 2016 06:32:49
Message: <56a8aae1$1@news.povray.org>
Same problem here. Just to render a part of the central hull of my
starship, it takes several days. I think, the problem is too many
individual shapes (like boxes and such).

I heard about a plugin for SketchUp, that can export to our POV-Ray
scene description language. As mesh.I am considering to design a number
of elements of my ship in Sketchup as meshes, and then add those meshes
to my POV-Ray scenes. I believe, I will gain render speed by replacing
hundreds of box with one single mesh shape. Could I be right with my
assumption?


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From: Sven Littkowski
Subject: Re: Colony ship
Date: 27 Jan 2016 06:35:19
Message: <56a8ab77$1@news.povray.org>
And I am happily rendering my spaceship at 17PPM. If I would render the
entire spaceship, I would expect to watch the finished render image in
somewhere in the 6th millennium AD...


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From: Stephen
Subject: Re: Colony ship
Date: 27 Jan 2016 07:39:03
Message: <56a8ba67$1@news.povray.org>
On 1/27/2016 11:32 AM, Sven Littkowski wrote:
> Same problem here. Just to render a part of the central hull of my
> starship, it takes several days. I think, the problem is too many
> individual shapes (like boxes and such).
>
> I heard about a plugin for SketchUp, that can export to our POV-Ray
> scene description language. As mesh.I am considering to design a number
> of elements of my ship in Sketchup as meshes, and then add those meshes
> to my POV-Ray scenes. I believe, I will gain render speed by replacing
> hundreds of box with one single mesh shape. Could I be right with my
> assumption?
>

I have not used SketchUp for some time and was going to say that most of 
the models looked very blocky and not very well textured. Then I 
rememberd that in the early days of TC-RTC a member used SketchUp with 
VRay. The models don't need to be blocky.

Have a look at:

http://www.tc-rtc.co.uk/image/upload//chandan/pw-1250429739-final3.jpg

and his other one

http://www.tc-rtc.co.uk/image/upload//chandan/pw-1245100893-Evidence_2.jpg

But if you are going to learn a new modeller why not give Blender a try?
I know it has a steep learning curve but it is not as bad as it was.
In both PovRay plugins* you can use PovCode for texturing.


* There is an official PovRay exporter and LanuHum's unofficial one.

-- 

Regards
     Stephen


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