 | | | Re: ANYTHING GLOWS - [ formerly - "Carrara renderer issue...kind of su | Re: ANYTHING GLOWS - [ formerly - "Carrara renderer issue...kind of su 2004-04-09 - By nicholas8681
Back
Peter,
I know how to get objects to emit light;)
What I am trying is to duplicate an experiment I saw in another
program.
A light (in this case a glow sphere at an end of one side of a hollow
cylinder) inside a curved mirrored surface cylinder....using indirect
light I want it to bounce around in the cylinder and come out the
other end.
I've had some success with amping up the indirect light settings..I
would think that using indirect light alone should be enough to get
the light, since the light "bounces" but for some reason this isn't
happening...now caustics simulates the effect..but I don't think its
doing at all what my intention is...and that is to get light to
bounce...
Brian
--- In Carrara@(protected), "Peter MacDougall" <pem@(protected)> wrote:
> Hi Claudia,
>
> There are two main ways to get an object to emit light in Carrara:
>
> 1.) add some glow to the glow channel of the object's shader and
then
> use the Photorealistic Renderer and Global Illumination-Indirect
Light
> turned on
>
> This only allows you to adjust intensity using the glow intensity of
> the object shader and the indirect light intensity in the Render
Room
> Global Illumination settings. Unavoidably, the object will glow in
the
> render.
>
> 2.) add an anything glows light and used the object as the "Item"
that
> acts as the light source.
>
> With anything glows you can adjust the origin of the light beams,
the
> fidelity of the light, the standoff distance and even whether soft
> shadows are used and their resolution, so with some adjustment you
> should be able to smooth out the light coming from the object
somewhat
> by setting the origin to facet, decreasing the standoff distance,
and
> increasing the fidelity. You can have a non-glowing object emit
light
> though. That being said, I still get an interesting reflection and
> banding with the AGlows light on a test image.
>
> You can also simulate the effect using bulb lights hidden inside
> objects, but the object must have "Cast shadows" turned off or the
> light will be trapped. Finally you can create the effect using
> compositing: overlaying a render without glow with a render of only
the
> object's glow to produce a composite image faking the effect.
>
> Light effects are only available for spot and bulb lights due to
their
> specific nature. There are tricks to try to generate the effect of a
> volumetric light cone with a object light source, but it would
involve
> multiple lights and would be hard to get right..
>
> On Wed, 07 Apr 2004 21:52:26 -0000, ccoles_avengers wrote:
>
> >Hi Brian,
> >
> >Okay, here's what I have been able to find out so far. I noticed
when
> >I used Anything Glows *along* with the glow channel, I was able to
get
> >the look and the effect of light eminating from within a cylinder
and
> >out from either of the two open ends. I am still learning about
> >"AGl", but I think with a little tweaking, it can do what I think
your
> >aiming at. At least somewhat. My CS4 Wishlist, however, would be
> >that the character and quality of the "AGl" light output be
similar to
> >the other lights (such as "Spot"). Right now, I still see a lot of
> >"faceting" within the light an AGl source casts, and some settings
are
> >worse than others. Also, effects such as "light cone" is not
> >accessible with "AGl" light sources.
> >
> >If you want, I can upload the CAR file on vizualds (I believe the
file
> >section here is getting full).
> >
> >Here is a link to the folder where you can access my JPEG renders
of
> >the CAR file I have been working:
> >
> >http://groups.yahoo.com/group/Carrara/files/Carrara%20Files_Images%
20%20-%20CC/Anything%20Glows/
> >
> >If you notice in the images, light is being casted through the
> >cylinder. I think the range and amount of light being casted,
> >however, is determined by the settings so I'm pretty sure you or
> >someone else can get better results than what I whipped up last
minute.
> >
> >Well, let me know what you found out so far and if I get better
> >results, I'll keep you posted.
> >
> >Cheers.
> >
> >Claudia
> >"Selocic"
> >(a newbie)
> >
> >--- In Carrara@(protected), "nicholas8681" <nicholas8681@(protected)>
wrote:
> >> Ahh..yeah I'll do that from now on:) Thanks.
> >>
> >> I'll try it with caustics...not sure that will give me what I
want
> >> though...I'm looking more of light to bounce...ie the indirect
> >> light..I'll try though and see what caustics does...I'd use
anything
> >> glows...but I don't think that anything glows can go down to
such a
> >> small point...plus the point of the experimenting was to see if
> >> carrara's built in render could do this:)
> >>
> >> Let me know if you come up with something!!!!
> >>
> >> Brian
> >> http://www.vizualds.com
> >> brian@(protected)
> >>
> >>
> >> --- In Carrara@(protected), "ccoles_avengers"
> >> <ccoles_shado@(protected)> wrote:
> >> > Hi Brian,
> >> >
> >> > Cool effect so far, but I think why I (and a few others) could
not
> >> see
> >> > your image initially is that your link became broken within
the e-
> >> mail
> >> > message.
> >> >
> >> > Here is your link again but I am sending this reply with "Wrap
> >> message
> >> > text" TURNED OFF (i.e. - unchecked). That way, the long link
> >> should
> >> > stay intact within the Yahoo e-mail system.
> >> >
> >> > Link:
> >> >
> >> >
> >>
http://www.vizualds.com/e107_plugins/coppermine_menu/displayimage.php
> >> ?album=14&pos=1
> >> >
> >> > Your image really helps illustrate what you are trying to do.
I
> >> would
> >> > suggest caustics as well, but what about increasing the size
of the
> >> > inside of the cylinder to give the light room to bounce ?
Also,
> >> are
> >> > you using just the glow channel or "Anything Glows". I think
that
> >> > "AGl" would help with this because it is used to emit light
from an
> >> > object, just as a light source (object = light source).
However,
> >> I'm
> >> > just guessing right now since I have not used AGl all that
much
> >> (but
> >> > have used it to emit light from an object).
> >> >
> >> > I'll see if I can get something going when I have the
time...will
> >> let
> >> > you know. Please post any of your updates when you get the
chance
> >> [
> >> > now I'm curious ;) ]
> >> >
> >> > Cheers.
> >> >
> >> > Claudia
> >> > "Selocic"
> >> > (a newbie)
> >> >
> >> >
> >> >
> >> >
> >> > --- In Carrara@(protected), "nicholas8681"
<nicholas8681@(protected)>
> >> wrote:
> >> > > Hmmm..thats odd...maybe I put up the wrong link sorry about
> >> that...
> >> > >
> >> > >
> >>
http://www.vizualds.com/e107_plugins/coppermine_menu/displayimage.php
> >> > > ?album=14&pos=1
> >> > >
> >> > >
> >> > > --- In Carrara@(protected), "jkyoutsey" <yahoo@(protected)>
wrote:
> >> > > > Your link doesn't lead directly to your image.
> >> > > >
> >> > > > Do you have caustics turned on? May help with what you
want
> >> to
> >> > > do,
> >> > > > but without the image it is a bit unclear as to the effect
you
> >> are
> >> > > > trying to create.
> >
> >
> >
> >
> >Special $30 OFF transposer until April 16, 2004.
> >
> >http://www.eovia.com/offers/yahoo.jsp
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
> Peter MacDougall
> pem@(protected)
> http://www3.telus.net/pem/index.htm
>
> Reality always exceeds your expectations.
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