POV-Ray : Newsgroups : povray.unofficial.patches : Shadowless spotlights, Server Time
1 Nov 2024 17:21:47 EDT (-0400)
  Shadowless spotlights, (Message 1 to 10 of 17)  
Goto Latest 10 Messages Next 7 Messages >>>
From: H  E  Day
Subject: Shadowless spotlights,
Date: 23 Jul 2000 00:37:52
Message: <01bff45f$cf276840$397889d0@daysix>
and why don't they work?  Tried this with both Mega and Offical versions.

-- 
H.E. Day
<><


Post a reply to this message

From: Bob Hughes
Subject: Re: Shadowless spotlights,
Date: 23 Jul 2000 01:34:57
Message: <397a8401@news.povray.org>
"H. E. Day" <Pov### [at] aolcom> wrote in message
news:01bff45f$cf276840$397889d0@daysix...
| and why don't they work?  Tried this with both Mega and Offical versions.

Works for me.


Post a reply to this message

From: Fabien Mosen
Subject: Re: Shadowless spotlights,
Date: 23 Jul 2000 08:34:22
Message: <397AE4FD.7DB2FA28@skynet.be>
"H. E. Day" wrote:
> 
> and why don't they work?  Tried this with both Mega and Offical versions.

I don't know if this is what you meant, but I noticed (some time ago) 
that, once you use shadowless, a spotlight is equal to a pointlight.  
It seems that the "limiting cone" is in fact a shadowing effect, 
and thus dissapear with shadowless...

In some cases, you could maybe get the feature you were seeking
by using the "light groups" in MegaPOV.

Fabien.


Post a reply to this message

From: Peter Popov
Subject: Re: Shadowless spotlights,
Date: 23 Jul 2000 12:51:08
Message: <j77mnscactaavltmmcsg96rc48c0knhevs@4ax.com>
On Sun, 23 Jul 2000 14:28:45 +0200, Fabien Mosen
<fab### [at] skynetbe> wrote:

>"H. E. Day" wrote:
>> 
>> and why don't they work?  Tried this with both Mega and Offical versions.
>
>I don't know if this is what you meant, but I noticed (some time ago) 
>that, once you use shadowless, a spotlight is equal to a pointlight.  
>It seems that the "limiting cone" is in fact a shadowing effect, 
>and thus dissapear with shadowless...

Shadowless lights were initially implemented as fill lights long
before radiosity provided a better solution. As such, they don't
create highlights, don't drop shadows and I think they are not
restricted by the spotlight light cone.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] usanet
TAG      e-mail : pet### [at] tagpovrayorg


Post a reply to this message

From: Bob Hughes
Subject: Re: Shadowless spotlights,
Date: 23 Jul 2000 15:30:08
Message: <397b47c0@news.povray.org>
Oh wow, that was a dumb thing for me to say about using a cone and arealight
to do the shadowless spotlight!  Hope my reply just now gets cancelled
before anyone sees it  :-)
Again, I hadn't realized this was the problem before, I was only looking for
a shadow or not.

Bob


Post a reply to this message

From: Gilles Tran
Subject: Re: Shadowless spotlights,
Date: 24 Jul 2000 04:16:10
Message: <397BFA6C.928E3D12@inapg.inra.fr>
From the manual:
"Shadowless may be used with area_light but not spotlight or cylinder."
I wish it were possible...
G.

"H. E. Day" wrote:

> and why don't they work?  Tried this with both Mega and Offical versions.
>
> --
> H.E. Day
> <><


Post a reply to this message

From: Warp
Subject: Re: Shadowless spotlights,
Date: 24 Jul 2000 06:08:22
Message: <397c1596@news.povray.org>
Gilles Tran <tra### [at] inapginrafr> wrote:
: From the manual:
: "Shadowless may be used with area_light but not spotlight or cylinder."

  I wonder what's the point in using a shadowless area_light. As far as I
know, it's a waste of time (using a point light would make no difference?).

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/


Post a reply to this message

From: Gilles Tran
Subject: Re: Shadowless spotlights,
Date: 24 Jul 2000 10:13:45
Message: <397C4E3E.BA7EDEB4@inapg.inra.fr>
Warp wrote:

> Gilles Tran <tra### [at] inapginrafr> wrote:
> : From the manual:
> : "Shadowless may be used with area_light but not spotlight or cylinder."
>
>   I wonder what's the point in using a shadowless area_light. As far as I
> know, it's a waste of time (using a point light would make no difference?).

Probably Povray just goes by the saying that everything that is not
formallyforbidden is authorised...
G.


Post a reply to this message

From: Chris Huff
Subject: Re: Shadowless spotlights,
Date: 24 Jul 2000 14:30:24
Message: <chrishuff-1E6582.13310424072000@news.povray.org>
In article <397c1596@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   I wonder what's the point in using a shadowless area_light. As far as I
> know, it's a waste of time (using a point light would make no 
> difference?).

I think you are right...area lights only affect shadows, the shading is 
the same as for point lights.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/


Post a reply to this message

From: GrimDude
Subject: Re: Shadowless spotlights,
Date: 3 Aug 2000 04:00:02
Message: <39892682@news.povray.org>
I had this problem once, and resorted to fading light.

Grim


Post a reply to this message

Goto Latest 10 Messages Next 7 Messages >>>

Copyright 2003-2023 Persistence of Vision Raytracer Pty. Ltd.