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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 08:25:05
Message: <4c122b21$1@news.povray.org>
On 11/06/2010 8:32 AM, Thomas de Groot wrote:
> "Stephen"<mca### [at] aolDOTcom>  schreef in bericht
> news:4c10a076@news.povray.org...
>>
>> If Mike does that then it may be realistic but it will be boring to look
>> at. IMO realistic space scenes show one feature while hiding most others
>> due to differences in scale. Do you remember the posts from a few years
>> back (2005) of Larry Niven’s (or it could have been Bill’s) Ringworld?
>> Having said that the ground could be s bit further away ;-)
>>
>
> Yes indeed. Bill, and myself, did some exploration that way back then; and
> there was some scenes based on Arthur Clarke's Rama iirc, some years ago
> too. It is not easy, fairly impossible, to show all, so a shrewd choice of
> viewpoint and scene cutout to suggest - more than to show - the vast
> dimensions of such artificial structures is needed.
>

I think that, that is the reason I gave up realistic modelling of scenes 
like that. (Claims bonus for using “that” three times in one sentence ;-) )
I now prefer to model what I see in my mind’s eye.


-- 

Best Regards,
	Stephen


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From: Bill Pragnell
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 08:45:02
Message: <web.4c122ef6f3c715fa6dd25f0b0@news.povray.org>
Stephen <mca### [at] aolDOTcom> wrote:
> On 11/06/2010 8:32 AM, Thomas de Groot wrote:
> > "Stephen"<mca### [at] aolDOTcom>  schreef in bericht
> >> If Mike does that then it may be realistic but it will be boring to look
> >> at. IMO realistic space scenes show one feature while hiding most others
> >> due to differences in scale. Do you remember the posts from a few years
> >> back (2005) of Larry Niven’s (or it could have been Bill’s) Ringworld?
> >> Having said that the ground could be s bit further away ;-)
> >
> > Yes indeed. Bill, and myself, did some exploration that way back then; and
> > there was some scenes based on Arthur Clarke's Rama iirc, some years ago
> > too. It is not easy, fairly impossible, to show all, so a shrewd choice of
> > viewpoint and scene cutout to suggest - more than to show - the vast
> > dimensions of such artificial structures is needed.
> >
> I think that, that is the reason I gave up realistic modelling of scenes
> like that. (Claims bonus for using “that” three times in one sentence ;-) )
> I now prefer to model what I see in my mind’s eye.

Ah, but I think Mike's approach with the interactive VR is exactly the way to do
a space habitat. I think the way the perspective distorts the edge of the frame
while panning gives the viewer an instinct for the fov that can be very tricky
for non-rectilinear geometries. I'm going to try this with my ringworld - and
I'll also dig out the O'Neill habitat that I started constructing some years
ago. (As an aside, this had a simple uniform fog inside it, and it worked very
well as a depth cue!)

Bill


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 09:25:37
Message: <4c123951@news.povray.org>
On 11/06/2010 1:41 PM, Bill Pragnell wrote:
> Stephen<mca### [at] aolDOTcom>  wrote:
>> On 11/06/2010 8:32 AM, Thomas de Groot wrote:
>>> "Stephen"<mca### [at] aolDOTcom>   schreef in bericht
>>>> If Mike does that then it may be realistic but it will be boring to look
>>>> at. IMO realistic space scenes show one feature while hiding most others
>>>> due to differences in scale. Do you remember the posts from a few years
>>>> back (2005) of Larry Niven’s (or it could have been Bill’s) Ringworld?
>>>> Having said that the ground could be s bit further away ;-)
>>>
>>> Yes indeed. Bill, and myself, did some exploration that way back then; and
>>> there was some scenes based on Arthur Clarke's Rama iirc, some years ago
>>> too. It is not easy, fairly impossible, to show all, so a shrewd choice of
>>> viewpoint and scene cutout to suggest - more than to show - the vast
>>> dimensions of such artificial structures is needed.
>>>
>> I think that, that is the reason I gave up realistic modelling of scenes
>> like that. (Claims bonus for using “that” three times in one sentence ;-) )
>> I now prefer to model what I see in my mind’s eye.
>
> Ah, but I think Mike's approach with the interactive VR is exactly the way to do
> a space habitat.

I agree with you. I think this is an interesting experiment. It makes me 
wonder what a game engine would make of it.

> I think the way the perspective distorts the edge of the frame
> while panning gives the viewer an instinct for the fov that can be very tricky
> for non-rectilinear geometries.

I’m not too sure about the distortion when you look straight down. It 
would make you seasick driving down those roads.

> I'm going to try this with my ringworld - and
> I'll also dig out the O'Neill habitat that I started constructing some years
> ago. (As an aside, this had a simple uniform fog inside it, and it worked very
> well as a depth cue!)
>

I look forward to seeing it.

-- 

Best Regards,
	Stephen


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From: Bill Pragnell
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 09:40:01
Message: <web.4c123c62f3c715fa6dd25f0b0@news.povray.org>
Stephen <mca### [at] aolDOTcom> wrote:
> I agree with you. I think this is an interesting experiment. It makes me
> wonder what a game engine would make of it.

That reminds me - ever play any of the Halo games? There's a pretty good
rendition of a ringworld, and beautiful to look at. I kept getting shot up cos I
was too busy ogling the scenery :-)


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 10:32:42
Message: <4c12490a$1@news.povray.org>
On 11/06/2010 2:38 PM, Bill Pragnell wrote:
> Stephen<mca### [at] aolDOTcom>  wrote:
>> I agree with you. I think this is an interesting experiment. It makes me
>> wonder what a game engine would make of it.
>
> That reminds me - ever play any of the Halo games? There's a pretty good
> rendition of a ringworld, and beautiful to look at. I kept getting shot up cos I
> was too busy ogling the scenery :-)
>
>

No, the last game I played was Doom II, Doom III was too dark for me to 
see anything. I’m not very good at games.
I’ll see if I can pick up a copy and try God mode.


-- 

Best Regards,
	Stephen


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 11:04:26
Message: <4c12507a@news.povray.org>
"Bill Pragnell" <bil### [at] hotmailcom> schreef in bericht 
news:web.4c122ef6f3c715fa6dd25f0b0@news.povray.org...
> Ah, but I think Mike's approach with the interactive VR is exactly the way 
> to do
> a space habitat. I think the way the perspective distorts the edge of the 
> frame
> while panning gives the viewer an instinct for the fov that can be very 
> tricky
> for non-rectilinear geometries. I'm going to try this with my ringworld - 
> and
> I'll also dig out the O'Neill habitat that I started constructing some 
> years
> ago. (As an aside, this had a simple uniform fog inside it, and it worked 
> very
> well as a depth cue!)
>

Would be nice to do a Ringworld again. We have progressed over the last five 
years, or so I hope :-)

I don't remember well now, was that epsilon issue fixed/corrected in version 
3.7 or not? At the time we had a rapid patch of 3.6 I seem to remember...

Thomas


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From: Bill Pragnell
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 11:20:00
Message: <web.4c1252bff3c715fa6dd25f0b0@news.povray.org>
"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> wrote:
> Would be nice to do a Ringworld again. We have progressed over the last five
> years, or so I hope :-)

Haven't touched mine for a while. Perhaps its time to haul it out again :)

> I don't remember well now, was that epsilon issue fixed/corrected in version
> 3.7 or not? At the time we had a rapid patch of 3.6 I seem to remember...

I think the smaller epsilon was to be included in 3.7. This was a few years ago
now so I guess it's in there... either have a peek at the source or try to
render something vast!


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From: Alain
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 12:55:18
Message: <4c126a76@news.povray.org>
Le 2010-06-11 10:32, Stephen a écrit :
> On 11/06/2010 2:38 PM, Bill Pragnell wrote:
>> Stephen<mca### [at] aolDOTcom> wrote:
>>> I agree with you. I think this is an interesting experiment. It makes me
>>> wonder what a game engine would make of it.
>>
>> That reminds me - ever play any of the Halo games? There's a pretty good
>> rendition of a ringworld, and beautiful to look at. I kept getting
>> shot up cos I
>> was too busy ogling the scenery :-)
>>
>>
>
> No, the last game I played was Doom II, Doom III was too dark for me to
> see anything. I’m not very good at games.
> I’ll see if I can pick up a copy and try God mode.
>
>
Doom III was way BAD. They totaly sacrified playability to athmosphere :(
Even in the living abitats and working areas, where a good lighting is 
vital, you had great dificulty seeing things. Another bad thing: it 
overrode your gamma/contrast/brightness settings and did not restore 
those on exit.


Alain


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From: Alain
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 13:23:13
Message: <4c127101@news.povray.org>
Le 2010-06-10 20:20, SharkD a écrit :
> Made the buildings larger, the roads narrower.
>
I realy like your new end cap. I also like that you now have more 
vegetation space.

But:
Why is the ground faceted and not smoothly curving?
Still to many road vehicles. The ONLY vehicles should be utility and 
public transportation, and positively NO personal ones.

On a space station, any space station, even an imensly huge one, 
resources are inherently scarce. Living space, parks space, working 
space, cargo space, air, water, raw and rafined materials, energy, 
everything is counted and counts. Personal cars are a waste of 
resources, and thus frowned uppon.

Juging by the dimentions of the buildings and other indices, I could 
relatively easily walk from one end to the other to get to work and back 
home. I could even walk back home for my lunch... After all, it looks 
like the overall length is less than about 2Km, or about a 10 to 20 
minutes walk. In such a case, taking a car would take about the same 
amount of time... and using a bike would reduce the time needed to 5 
minutes or less. (I need about 20 minutes to walk about 3Km. Most 
peoples have a walking speed ranging from 5 to 7Km/h)


Alain


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 11 Jun 2010 18:18:24
Message: <4c12b630$1@news.povray.org>
On 11/06/2010 5:55 PM, Alain wrote:
> Doom III was way BAD. They totaly sacrified playability to athmosphere :(
> Even in the living abitats and working areas, where a good lighting is
> vital, you had great dificulty seeing things. Another bad thing: it
> overrode your gamma/contrast/brightness settings and did not restore
> those on exit.

You won’t get an argument from me on that view. ;-)

-- 

Best Regards,
	Stephen


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 03:01:48
Message: <4c1330dc$1@news.povray.org>
"Bill Pragnell" <bil### [at] hotmailcom> schreef in bericht 
news:web.4c1252bff3c715fa6dd25f0b0@news.povray.org...
> I think the smaller epsilon was to be included in 3.7. This was a few 
> years ago
> now so I guess it's in there... either have a peek at the source or try to
> render something vast!

Yes, that is what I thought too. I'll do something vast... :-)

Thomas


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 03:15:15
Message: <4c133403@news.povray.org>
Two new renders. One from last night showing the atmosphere and rounded 
portal to outside. And one from just a few minutes ago showing the 
curved (as well as some new) buildings.

-- 
http://isometricland.com


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gh_scene_buildingstrip_curve_c.png


 

From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 03:30:44
Message: <4c1337a4$1@news.povray.org>
On 12/06/2010 8:14 AM, SharkD wrote:
> Two new renders. One from last night showing the atmosphere and rounded
> portal to outside. And one from just a few minutes ago showing the
> curved (as well as some new) buildings.
>

Looking better :-D

-- 

Best Regards,
	Stephen


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 04:48:17
Message: <4c1349d1@news.povray.org>
"Thomas de Groot" <tDOTdegroot@interDOTnlANOTHERDOTnet> schreef in bericht 
news:4c1330dc$1@news.povray.org...
> Yes, that is what I thought too. I'll do something vast... :-)
>

Just to test, a quick-and-dirty scene from the past, rapidly adapted to 3.7, 
without any atmospheric effects at all, and viewed from close to the 
Ringworld floor.

No epsilon artefacts indeed. Maybe time to produce something better now... 
:-)  Time allowing, I intend to take up the project again.

Thomas


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 06:58:43
Message: <4c136863$1@news.povray.org>
On 12/06/2010 9:48 AM, Thomas de Groot wrote:
> "Thomas de Groot"<tDOTdegroot@interDOTnlANOTHERDOTnet>  schreef in bericht
> news:4c1330dc$1@news.povray.org...
>> Yes, that is what I thought too. I'll do something vast... :-)
>>
>
> Just to test, a quick-and-dirty scene from the past, rapidly adapted to 3.7,
> without any atmospheric effects at all, and viewed from close to the
> Ringworld floor.
>
> No epsilon artefacts indeed. Maybe time to produce something better now...
> :-)  Time allowing, I intend to take up the project again.
>

Ooo! Nicer :-)

-- 

Best Regards,
	Stephen


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 10:55:29
Message: <4c139fe1@news.povray.org>
"Stephen" <mca### [at] aolDOTcom> schreef in bericht 
news:4c136863$1@news.povray.org...
>
> Ooo! Nicer :-)

<grin>
...or on a heavily polluted surface. This is about the lowest possible 
camera position without epsilon artefacts in 3.7 (as I modelled from the 
original dimensions, about 0.05 miles from the surface; how many feet are 
that??).   ;-)

Just playing around for now. The more serious work will come later...

Thomas


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From: Alain
Subject: Re: "Spinner" space colony (2)
Date: 12 Jun 2010 14:21:38
Message: <4c13d032@news.povray.org>
Le 2010-06-12 10:55, Thomas de Groot a écrit :
> "Stephen"<mca### [at] aolDOTcom>  schreef in bericht
> news:4c136863$1@news.povray.org...
>>
>> Ooo! Nicer :-)
>
> <grin>
> ...or on a heavily polluted surface. This is about the lowest possible
> camera position without epsilon artefacts in 3.7 (as I modelled from the
> original dimensions, about 0.05 miles from the surface; how many feet are
> that??).   ;-)
>
> Just playing around for now. The more serious work will come later...
>
> Thomas
>
>
>

0.05 miles, that just around 110feet.

Alain


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 03:09:47
Message: <4c14843b@news.povray.org>
"Alain" <aze### [at] qwertyorg> schreef in bericht 
news:4c13d032@news.povray.org...
>
> 0.05 miles, that just around 110feet.
>

Ah! Not bad at all! Now, working on a superposed local landscape becomes 
extremely easy. However, far away textures and skies need more attention 
obviously.

Thomas


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 03:43:32
Message: <4c148c24$1@news.povray.org>
On 12/06/2010 3:55 PM, Thomas de Groot wrote:
> "Stephen"<mca### [at] aolDOTcom>  schreef in bericht
> news:4c136863$1@news.povray.org...
>>
>> Ooo! Nicer :-)
>
> <grin>
> ....or on a heavily polluted surface. This is about the lowest possible
> camera position without epsilon artefacts in 3.7 (as I modelled from the
> original dimensions, about 0.05 miles from the surface; how many feet are
> that??).   ;-)
>
> Just playing around for now. The more serious work will come later...
>

I like the banding from the clouds :-)

-- 

Best Regards,
	Stephen


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 05:49:00
Message: <4c14a98c$1@news.povray.org>
On 6/12/2010 3:30 AM, Stephen wrote:
> On 12/06/2010 8:14 AM, SharkD wrote:
>> Two new renders. One from last night showing the atmosphere and rounded
>> portal to outside. And one from just a few minutes ago showing the
>> curved (as well as some new) buildings.
>>
>
> Looking better :-D
>

Render times just shot through the roof though! My test scene is a lot 
simpler, but it's taking about an hour to render now instead of a few 
seconds. I can't imagine how long the full scene is going to take to 
render...

-- 
http://isometricland.com


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 05:58:55
Message: <4c14abdf$1@news.povray.org>
On 13/06/2010 10:48 AM, SharkD wrote:
> On 6/12/2010 3:30 AM, Stephen wrote:
>> On 12/06/2010 8:14 AM, SharkD wrote:
>>> Two new renders. One from last night showing the atmosphere and rounded
>>> portal to outside. And one from just a few minutes ago showing the
>>> curved (as well as some new) buildings.
>>>
>>
>> Looking better :-D
>>
>
> Render times just shot through the roof though! My test scene is a lot
> simpler, but it's taking about an hour to render now instead of a few
> seconds. I can't imagine how long the full scene is going to take to
> render...
>

It looks like it might be worth it. :-D

-- 

Best Regards,
	Stephen


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 06:20:53
Message: <4c14b105$1@news.povray.org>
On 6/13/2010 5:58 AM, Stephen wrote:
> It looks like it might be worth it. :-D

Well, the last time I rendered the full scene it took all night. That 
was before the recent changes. :(

-- 
http://isometricland.com


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 08:02:57
Message: <4c14c8f1@news.povray.org>
"Stephen" <mca### [at] aolDOTcom> schreef in bericht 
news:4c148c24$1@news.povray.org...
>
> I like the banding from the clouds :-)

The banding (on the Ringwold) is not from the clouds however, but from the 
Shadow Squares... :-)

Thomas


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 08:05:36
Message: <4c14c990$1@news.povray.org>
"SharkD" <pos### [at] gmailcom> schreef in bericht 
news:4c14b105$1@news.povray.org...
> On 6/13/2010 5:58 AM, Stephen wrote:
>> It looks like it might be worth it. :-D
>
> Well, the last time I rendered the full scene it took all night. That was 
> before the recent changes. :(
>

Most of my scenes, in the end, take more than 24 hours to render with 2 
cores, more tipically about 72 hours...  :-)

Thomas


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 10:29:26
Message: <4c14eb46$1@news.povray.org>
On 13/06/2010 1:02 PM, Thomas de Groot wrote:
> "Stephen"<mca### [at] aolDOTcom>  schreef in bericht
> news:4c148c24$1@news.povray.org...
>>
>> I like the banding from the clouds :-)
>
> The banding (on the Ringwold) is not from the clouds however, but from the
> Shadow Squares... :-)
>

Even so looks good.

-- 

Best Regards,
	Stephen


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 13 Jun 2010 10:30:48
Message: <4c14eb98@news.povray.org>
On 13/06/2010 11:20 AM, SharkD wrote:
> On 6/13/2010 5:58 AM, Stephen wrote:
>> It looks like it might be worth it. :-D
>
> Well, the last time I rendered the full scene it took all night. That
> was before the recent changes. :(
>

Quality is not cheap ;-)

-- 

Best Regards,
	Stephen


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 02:11:43
Message: <4c15c81f$1@news.povray.org>
On 6/13/2010 10:30 AM, Stephen wrote:
> On 13/06/2010 11:20 AM, SharkD wrote:
>> On 6/13/2010 5:58 AM, Stephen wrote:
>>> It looks like it might be worth it. :-D
>>
>> Well, the last time I rendered the full scene it took all night. That
>> was before the recent changes. :(
>>
>
> Quality is not cheap ;-)
>

How good is the radiosity pretrace as an estimator of how long a scene 
will take to render? Right now it takes about 10 seconds to render a 
pixel, even with a reduced texture quality.

-- 
http://isometricland.com


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 02:18:28
Message: <4c15c9b4@news.povray.org>
Another render showing another new building type and a variety of other 
objects.

-- 
http://isometricland.com


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 03:20:51
Message: <4c15d853$1@news.povray.org>
"SharkD" <pos### [at] gmailcom> schreef in bericht 
news:4c15c9b4@news.povray.org...
> Another render showing another new building type and a variety of other
> objects.
>

This is looking really good!

Thomas


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From: Stephen
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 08:07:23
Message: <4c161b7b$1@news.povray.org>
On 14/06/2010 7:11 AM, SharkD wrote:

>>
>> Quality is not cheap ;-)
>>
>
> How good is the radiosity pretrace as an estimator of how long a scene
> will take to render? Right now it takes about 10 seconds to render a
> pixel, even with a reduced texture quality.
>

Not for me to answer as I seldom use radiosity. 10 seconds a pixel, WOW!
-- 

Best Regards,
	Stephen


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From: clipka
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 08:35:33
Message: <4c162215$1@news.povray.org>
Am 14.06.2010 08:11, schrieb SharkD:

> How good is the radiosity pretrace as an estimator of how long a scene
> will take to render? Right now it takes about 10 seconds to render a
> pixel, even with a reduced texture quality.

It's usually not a good estimator, because there are various factors 
involved:

The Good News:

- Unless radiosity pretrace settings are poor, the pretrace will take a 
significantly higher ratio of radiosity samples per pixel (with each 
sample requiring tens, hundreds, or even up to 1600 more rays to be 
shot, albeit with a few simplifications).

- Using low_error_factor significantly increases the "cost" of sample 
lookup (i.e. looking up samples that have already been taken nearby) 
during pretrace, while leaving the "cost" during main render unchanged.

The Bad News:

- As the pretrace progresses, the total number of samples keeps 
increasing (of course), which also increases the overhead of checking 
which samples are suitable for re-use; thus, sample re-use is 
comparatively more "expensive" during the main render than during the 
first pretrace steps.

- Some features are disabled during pretrace, most notably antialiasing 
and focal blur, so these added "costs" don't show during pretrace.


So, all in all, pretrace may or may not be slower or faster than main 
render - it depends.

A smaller-sized render is probably a much better indicator of the main 
render performance.


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 16:23:35
Message: <4c168fc7$1@news.povray.org>
On 6/14/2010 3:20 AM, Thomas de Groot wrote:
> "SharkD"<pos### [at] gmailcom>  schreef in bericht
> news:4c15c9b4@news.povray.org...
>> Another render showing another new building type and a variety of other
>> objects.
>>
>
> This is looking really good!
>
> Thomas
>
>

Yeah, clipka's advice on compensating for gamma really helped a bunch!

-- 
http://isometricland.com


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 18:12:51
Message: <4c16a963$1@news.povray.org>
What kinds of things might be the causes of all the slowdown? I've 
turned off all media and reflection and it is still abysmally slow.

One major revision I've made to Chris Colefax's CityGen include file is 
that each building is now called by a macro and generated individually 
at runtime. Whereas originally a single copy (more or less) of a 
building was stored in an array and replicated/duplicated when needed.

The other difference of course is that buildings now have greater 
complexity. They make use of more CSG operations and feature a greater 
number of storeys.

-- 
http://isometricland.com


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From: Alain
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 19:03:34
Message: <4c16b546$1@news.povray.org>
Le 2010-06-14 18:12, SharkD a écrit :
> What kinds of things might be the causes of all the slowdown? I've
> turned off all media and reflection and it is still abysmally slow.
>
> One major revision I've made to Chris Colefax's CityGen include file is
> that each building is now called by a macro and generated individually
> at runtime. Whereas originally a single copy (more or less) of a
> building was stored in an array and replicated/duplicated when needed.
>
> The other difference of course is that buildings now have greater
> complexity. They make use of more CSG operations and feature a greater
> number of storeys.
>

You have a "concave" geometry composed of many objects made out of 
coaxyal cylinders slices. This can very easily lead to bounding problems 
where most objects bounding boxes overlap each other, and are 
excessively large.

Try manualy bounding the individual buildings. Try to see if you can use 
some mesh.
Use simple boxes or prisms for narrow buildings and some of the farder 
ones. Some/most broad buildings probably can do with only a texture that 
curves instead of the actual floors.

Except for the closest buildings, don't model individual floors. A flat 
topped conical building can be a simple truncated cone. The flat base 
beed hiden under the ground. If needed, remove a small cylindrical part 
from it's top.

Only model the interior of a building IF you look from it's inside or 
take a closeup look into it. Use conditional statements, possibly based 
on insideness test or bounding box test to toggle the insides as needed.



Alain


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 19:31:17
Message: <4c16bbc5$1@news.povray.org>
On 6/14/2010 7:03 PM, Alain wrote:
> Le 2010-06-14 18:12, SharkD a écrit :
>> What kinds of things might be the causes of all the slowdown? I've
>> turned off all media and reflection and it is still abysmally slow.
>>
>> One major revision I've made to Chris Colefax's CityGen include file is
>> that each building is now called by a macro and generated individually
>> at runtime. Whereas originally a single copy (more or less) of a
>> building was stored in an array and replicated/duplicated when needed.
>>
>> The other difference of course is that buildings now have greater
>> complexity. They make use of more CSG operations and feature a greater
>> number of storeys.
>>
>
> You have a "concave" geometry composed of many objects made out of
> coaxyal cylinders slices. This can very easily lead to bounding problems
> where most objects bounding boxes overlap each other, and are
> excessively large.
>
> Try manualy bounding the individual buildings. Try to see if you can use
> some mesh.
> Use simple boxes or prisms for narrow buildings and some of the farder
> ones. Some/most broad buildings probably can do with only a texture that
> curves instead of the actual floors.
>
> Except for the closest buildings, don't model individual floors. A flat
> topped conical building can be a simple truncated cone. The flat base
> beed hiden under the ground. If needed, remove a small cylindrical part
> from it's top.
>
> Only model the interior of a building IF you look from it's inside or
> take a closeup look into it. Use conditional statements, possibly based
> on insideness test or bounding box test to toggle the insides as needed.
>
>
>
> Alain

Here's the macro I use to generate the concave cylinder sections:

#macro cyl_box(in_star, in_stop)
	#local in_star_height	= city_radius - in_star.y;
	#local in_stop_height	= city_radius - in_stop.y;
	#local in_star_z_angle	= in_star.x/city_circum * 360;
	#local in_stop_z_angle	= in_stop.x/city_circum * 360;
	difference
	{
		cylinder {<0,0,in_star.z-0>, <0,0,in_stop.z+0>, in_star_height}
		cylinder {<0,0,in_star.z-1>, <0,0,in_stop.z+1>, in_stop_height}
		plane {+x, 0 rotate z * in_star_z_angle}
		plane {-x, 0 rotate z * in_stop_z_angle}
		bounded_by {cylinder {<0,0,in_star.z-0>, <0,0,in_stop.z+0>, 
in_star_height}}
	}
#end

Can I use an object produced by this macro as a bounding object? Would 
it be better to use a mesh instead? Does bounding work on unions and 
merges as well as differences and intersections?

-- 
http://isometricland.com


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From: clipka
Subject: Re: "Spinner" space colony (2)
Date: 14 Jun 2010 21:21:44
Message: <4c16d5a8$1@news.povray.org>
Am 15.06.2010 01:31, schrieb SharkD:

> difference
> {
> cylinder {<0,0,in_star.z-0>, <0,0,in_stop.z+0>, in_star_height}
> cylinder {<0,0,in_star.z-1>, <0,0,in_stop.z+1>, in_stop_height}
> plane {+x, 0 rotate z * in_star_z_angle}
> plane {-x, 0 rotate z * in_stop_z_angle}
> bounded_by {cylinder {<0,0,in_star.z-0>, <0,0,in_stop.z+0>,
> in_star_height}}
> }

That bounded_by gives you no benefit; try computing a snugly fitting box 
instead.


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From: Bill Pragnell
Subject: Re: "Spinner" space colony (2)
Date: 15 Jun 2010 04:05:01
Message: <web.4c173309f3c715fa6dd25f0b0@news.povray.org>
SharkD <pos### [at] gmailcom> wrote:
> Can I use an object produced by this macro as a bounding object? Would
> it be better to use a mesh instead?

> Does bounding work on unions and
> merges as well as differences and intersections?

Difference and intersection benefit most from manual bounding, because in many
cases the auto bounding box can be orders of magnitude larger than the result of
the CSG operation. I once wrote a curved-brick macro that achieved something
like 10x speedup once I sorted the bounding out.

Meshes will be faster (non-csg meshes, at least), although presumably that would
mean more work for you... :-(


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 17 Jun 2010 04:55:23
Message: <4c19e2fb@news.povray.org>
I seem to have resolved most of the bounding image. The following test 
render only took about an hour to render. Not bad.

-- 
http://isometricland.com


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Attachments:
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Preview of image 'gh_scene_spinner_cubemap_r.png'
gh_scene_spinner_cubemap_r.png


 

From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 17 Jun 2010 04:59:18
Message: <4c19e3e6$1@news.povray.org>
On 6/17/2010 4:54 AM, SharkD wrote:
> I seem to have resolved most of the bounding image. The following test
> render only took about an hour to render. Not bad.
>

"Bounding issues", rather. Also forgot to mention that I replaced all 
the cylinders, spheres and so forth with meshes. However, I wasn't able 
to detect any performance improvement in this particular instance.

-- 
http://isometricland.com


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 19 Jun 2010 13:57:48
Message: <4c1d051c@news.povray.org>
A new building type, as well as pedestrians, trash cans and potted plants.

-- 
http://isometricland.com


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Download 'gh_scene_buildingstrip_curve_f.jpg' (111 KB)

Preview of image 'gh_scene_buildingstrip_curve_f.jpg'
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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 21 Jun 2010 13:22:11
Message: <4c1f9fc3@news.povray.org>
Ack! I tried rendering again this time with radiosity, the atmosphere 
and so forth turned on, and render times went through the roof!

I'm getting to be f*****g tired of having to deal with all this 
low-level stuff! I want to get back to the creative side of the project!!

-- 
http://isometricland.com


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From: Thomas de Groot
Subject: Re: "Spinner" space colony (2)
Date: 22 Jun 2010 05:14:03
Message: <4c207edb$1@news.povray.org>
"SharkD" <pos### [at] gmailcom> schreef in bericht 
news:4c1f9fc3@news.povray.org...
> Ack! I tried rendering again this time with radiosity, the atmosphere and 
> so forth turned on, and render times went through the roof!
>
> I'm getting to be f*****g tired of having to deal with all this low-level 
> stuff! I want to get back to the creative side of the project!!
>

There always comes a time when you have to deal with that stuff  :-)  Be 
patient. Just don't let it eat you up.

Thomas


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 23 Jun 2010 13:05:37
Message: <4c223ee1@news.povray.org>
A new decorative object for the parks.

-- 
http://isometricland.com


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Preview of image 'gh_scene_buildingstrip_curve.png'
gh_scene_buildingstrip_curve.png


 

From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 23 Jun 2010 13:11:11
Message: <4c22402f@news.povray.org>
On 6/23/2010 1:05 PM, SharkD wrote:
> A new decorative object for the parks.
>

I'm also considering a shiny gold Kepler Poinsot solid and an 
"historical" spacecraft, both from the Object Collection.

-- 
http://isometricland.com


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From: clipka
Subject: Re: "Spinner" space colony (2)
Date: 23 Jun 2010 14:28:50
Message: <4c225262$1@news.povray.org>
Am 23.06.2010 19:05, schrieb SharkD:
> A new decorative object for the parks.

Nice one! There must be an artist living there.


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 23 Jun 2010 14:43:49
Message: <4c2255e5@news.povray.org>
Here are results of some test renders showing the effects of turning 
certain features on/off.


Legend:

rad   = radiosity
atmos = atmospheric media
fit   = the method I used to bound the buildings in boxes
qual  = the quality of the textures & materials
     0 = random pigments, no finishes, no media
   1/2 = regular pigments & finishes, no media
     1 = regular pigments, finishes, & media
seconds = the time elapsed from start to finish on a 2.4GHz single-core 
Celeron CPU with 3GiB RAM
pov   = POV-Ray version, either 3.6.2 or 3.7.0 beta 37a




-- 
http://isometricland.com


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Attachments:
Download 'gh_scene_spinner_cubemap__a.png' (143 KB) Download 'gh_scene_spinner_cubemap__b.png' (145 KB) Download 'gh_scene_spinner_cubemap__c.png' (143 KB) Download 'gh_scene_spinner_cubemap__d.png' (172 KB) Download 'gh_scene_spinner_cubemap__e.png' (179 KB) Download 'gh_scene_spinner_cubemap__f.png' (140 KB) Download 'gh_scene_spinner_cubemap__g.png' (179 KB)

Preview of image 'gh_scene_spinner_cubemap__a.png'
gh_scene_spinner_cubemap__a.png

Preview of image 'gh_scene_spinner_cubemap__b.png'
gh_scene_spinner_cubemap__b.png

Preview of image 'gh_scene_spinner_cubemap__c.png'
gh_scene_spinner_cubemap__c.png

Preview of image 'gh_scene_spinner_cubemap__d.png'
gh_scene_spinner_cubemap__d.png

Preview of image 'gh_scene_spinner_cubemap__e.png'
gh_scene_spinner_cubemap__e.png

Preview of image 'gh_scene_spinner_cubemap__f.png'
gh_scene_spinner_cubemap__f.png

Preview of image 'gh_scene_spinner_cubemap__g.png'
gh_scene_spinner_cubemap__g.png


 

From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 23 Jun 2010 19:38:35
Message: <4c229afb@news.povray.org>
More decorations.


-- 
http://isometricland.com


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gh_scene_buildingstrip_curve_parks.png

Preview of image 'gh_scene_buildingstrip_curve_squares.png'
gh_scene_buildingstrip_curve_squares.png


 

From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 23 Jun 2010 22:32:47
Message: <4c22c3cf@news.povray.org>
Two more test renders. After 18 hours 28% of the image completed, and 
then dropped to the PPM range instead of PPS when it got to the crowded 
bits.

:(

-- 
http://isometricland.com


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gh_scene_spinner_cubemap__h.png

Preview of image 'gh_scene_spinner_cubemap__i.png'
gh_scene_spinner_cubemap__i.png


 

From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 25 Jun 2010 11:04:46
Message: <4c24c58e@news.povray.org>
Another test render. I seem too have eliminated a few more bottlenecks. 
This one only took 15273.62 seconds with all features turned on except 
the atmospheric media.


-- 
http://isometricland.com


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From: SharkD
Subject: Re: "Spinner" space colony (2)
Date: 25 Jun 2010 11:07:57
Message: <4c24c64d@news.povray.org>
On 6/25/2010 11:04 AM, SharkD wrote:
> Another test render. I seem too have eliminated a few more bottlenecks.
> This one only took 15273.62 seconds with all features turned on except
> the atmospheric media.
>
>

Forgot the image. ;)

Anyway, the atmospheric media seems to be the main remaining bottleneck. 
Not sure how to make it perform faster.


-- 
http://isometricland.com


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