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Is possible to use some textured sky_sphere, but specify, that each
raiosity ray, which geos out of scene, gathers some specified color, not
color of sky? When I have blue sky, all objects in scene takes blue
color, it not what I want...
Regards
Disnek
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I'll second that. I had the same problem playing around with it the other
day. I need the blue sky because it shows, but radiosity made everything
blue! General "radiosity no" switch per object?
"Disnel" <dis### [at] hlavacek-partner cz> wrote in message
news:3AB### [at] hlavacek-partnercz...
> Is possible to use some textured sky_sphere, but specify, that each
> raiosity ray, which geos out of scene, gathers some specified color, not
> color of sky? When I have blue sky, all objects in scene takes blue
> color, it not what I want...
>
> Regards
>
> Disnek
>
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From: Christoph Hormann
Subject: Re: Background or sky_sphere and radiosity
Date: 17 Mar 2001 03:44:03
Message: <3AB323D4.D2491C9B@gmx.de>
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"John M. Dlugosz" wrote:
>
> I'll second that. I had the same problem playing around with it the other
> day. I need the blue sky because it shows, but radiosity made everything
> blue! General "radiosity no" switch per object?
>
IMO it would be better to have a separate 'radiosity_ambient' finish
component, but anyway this should not be necessary in most cases.
Some things that can be done about too strong effects of blue sky:
- The main light source usually should be quite yellow-orange. The
configuration suggested by Kari Kivisalo is often a good basis:
news://news.povray.org/39B59C6A.59AA5E52@kivisalo.net
- The objects' colors and finishes have to be adapted to radiosity
lighting. This can always solve the problem, you can even use negative
blue color components although this should not be necessary.
- finally you can also play with the radiosity settings, especially
'brightness', 'gray_threshold' and 'max_sample'.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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On Fri, 16 Mar 2001 19:15:46 +0100, Disnel
<dis### [at] hlavacek-partnercz> wrote:
>Is possible to use some textured sky_sphere, but specify, that each
>raiosity ray, which geos out of scene, gathers some specified color, not
>color of sky? When I have blue sky, all objects in scene takes blue
>color, it not what I want...
For your sky, try using a large hollow sphere with no_reflection (in
MegaPOV). This should cause the sphere to be visible by camera rays
only (i.e. directly). Specify whatever background color you wish and
it should tint the radiosity accordingly.
Oh, and please let us know if it works :)
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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Peter Popov wrote:
For your sky, try using a large hollow sphere with no_reflection (in
> MegaPOV). This should cause the sphere to be visible by camera rays
> only (i.e. directly). Specify whatever background color you wish and
> it should tint the radiosity accordingly.
Good idea, I'll try it. I don't know, is radiosity rays are taken as "reflected" or
not ...
Another solution is to add radiosity_background, or some similar setting to POV...
>
> Oh, and please let us know if it works :)
>
Sure ;-).
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In article <9ld6bt8jcrucpgh9559ir77rskus3fnb75@4ax.com>, Peter Popov
<pet### [at] vipbg> wrote:
> For your sky, try using a large hollow sphere with no_reflection (in
> MegaPOV). This should cause the sphere to be visible by camera rays
> only (i.e. directly). Specify whatever background color you wish and
> it should tint the radiosity accordingly.
I don't think this will work...as far as I know, radiosity samples are
taken as if they were camera rays, so if it is visible to the camera, it
is visible to radiosity.
--
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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On Sat, 17 Mar 2001 10:19:04 -0500, Chris Huff <chr### [at] maccom>
wrote:
>I don't think this will work...as far as I know, radiosity samples are
>taken as if they were camera rays, so if it is visible to the camera, it
>is visible to radiosity.
I wonder why. It doesn't make sense to me. Can someone please explain?
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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In article <71m7btcbcguaoigqmbshrfdulggc8pa0pr@4ax.com>, Peter Popov
<pet### [at] vipbg> wrote:
> >I don't think this will work...as far as I know, radiosity samples are
> >taken as if they were camera rays, so if it is visible to the camera, it
> >is visible to radiosity.
> I wonder why. It doesn't make sense to me. Can someone please explain?
Because radiosity doesn't have anything to do with ordinary reflection?
I know diffuse illumination is from reflection in the real world, but
radiosity doesn't have anything to do directly with the value specified
using the "reflection" keyword, so I don't think it would make sense for
"no_reflection" to affect it. The "no_image" keyword might, but it will
also make it invisible to the camera...a "no_radiosity" flag is needed.
I think to be really useful, we would need some kind of
"visibility_group" or "interaction_group" feature to specify which
objects reflect/transmit which objects. Maybe separate
"reflection_group", "radiosity_group", "transparence_group", etc...but I
think a single group keyword should be able to control all of this.
--
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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On Sat, 17 Mar 2001 18:13:43 -0500, Chris Huff <chr### [at] maccom>
wrote:
>Because radiosity doesn't have anything to do with ordinary reflection?
But no_reflection also affects filtered/transmitted and refracted
rays... I think it only checks camera rays for intersection.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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>
> For your sky, try using a large hollow sphere with no_reflection (in
> MegaPOV). This should cause the sphere to be visible by camera rays
> only (i.e. directly). Specify whatever background color you wish and
> it should tint the radiosity accordingly.
>
> Oh, and please let us know if it works :)
>
No, it not work :(
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