Am new to POVRAY, but not to 3d; I draw signs which are internally lighted
and want to try POVRAY for its output, to see what images look like.  Are
there images on web, like what I do, so I can see them or perhaps study the
scripts involved?

The signs normally have plastic faces, or flexible style faces - like an
awning - and I draw awnings too; and I've got programs to try that will
interface to POVRAY, re script creation, but I wonder will I have any luck
with materials that let light pass through (the text on a sign or awning
face) and make a credible show of giving off light in the evening hours?

If any of you have general tips on the matter, I'd like to hear about
ways to approach the method.  (And I will continue reading POV's docs and
tutorials, of course).

I want to step up from my old trusty truSpace, which creates stuff that
looks like "PC graphics," if you know what I mean.

Thanks for ideas/opinions,
Best, --pat (the new kid on the block)

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"Pat" <nomail@nomail> wrote in message 
news:web.42ec7befd63c4adb9e47bc2b0@news.povray.org...
> Am new to POVRAY, but not to 3d; I draw signs which are internally lighted
> and want to try POVRAY for its output, to see what images look like.  Are
> there images on web, like what I do, so I can see them or perhaps study 
> the
> scripts involved?

Hiya Pat, welcome to the POV community.

Well, hmmm, can't think of any sample scenes included with POV that match 
exactly what you're asking about.

> The signs normally have plastic faces, or flexible style faces - like an
> awning - and I draw awnings too; and I've got programs to try that will
> interface to POVRAY, re script creation, but I wonder will I have any luck
> with materials that let light pass through (the text on a sign or awning
> face) and make a credible show of giving off light in the evening hours?

You'll probably be using various amounts of filtered transparency, for one. 
That's simple enough. Just use pigment colors with either rgbf 
<0.1,0.2,0.3,0.4> or keyword filter 0.4. A light_source would be inside or 
the backside of the sign object and shine through based on that filtered 
amount. 0 = none, 1 = completely, and anything inbetween will vary the 
transparency. The colors used will illuminate other objects in the path of 
the light.

What you'll also need to read about is area_light, about its usefulness and 
pitfalls (affects only shadows).

Since you might be mixing text with a surrounding object you'll no doubt 
need separate pigments/filters for the parts, so if you understand about 
putting together parts you should have an easy time applying different 
textures to them.

Oh, I just thought of one thing anyway... take a look at the Insert menu, 
Scene File Templates then Image Map (while a file is open in the editor). It 
has filtering used on an image file. Well, okay, that's not much help unless 
you use image maps, too. Maybe you'll do CSG (combining of shapes, like text 
and box). Depends a lot on how you actually want to go about the 
sign-making. Another possiblity is to use 'media' as a way to make the sign 
glow.

Another thing before I go. You could also use radiosity and photons to get 
the sign objects to illuminate their surroundings, perhaps more 
realistically, but that gets tricky for a new user. Depends a lot on what 
kind of environment exists around the sign. If you're idea is to show only 
the sign itself, well, that'd be different, too. I'll leave you with that 
thought, and hopefully not confused. I'm sleepy anyhow so that could cause 
bad info.
; )
Bob Hughes

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Pat nous apporta ses lumieres en ce 2005-07-31 03:21:
> Am new to POVRAY, but not to 3d; I draw signs which are internally lighted
> and want to try POVRAY for its output, to see what images look like.  Are
> there images on web, like what I do, so I can see them or perhaps study the
> scripts involved?
> 
> The signs normally have plastic faces, or flexible style faces - like an
> awning - and I draw awnings too; and I've got programs to try that will
> interface to POVRAY, re script creation, but I wonder will I have any luck
> with materials that let light pass through (the text on a sign or awning
> face) and make a credible show of giving off light in the evening hours?
> 
> If any of you have general tips on the matter, I'd like to hear about
> ways to approach the method.  (And I will continue reading POV's docs and
> tutorials, of course).
> 
> I want to step up from my old trusty truSpace, which creates stuff that
> looks like "PC graphics," if you know what I mean.
> 
> Thanks for ideas/opinions,
> Best, --pat (the new kid on the block)
> 
> 
If you see only the sign, out of context. I'd use a box with an image_map with some
transparent 
parts. Behind that, you put a box with a pigment that matches the light's colour you
want and a 
finish{ambient 1 diffuse 0} to make it "glow".
It may looks something like this:
union{
	difference{//the case
		box{<10,5,1>,<-10,-5,-1>}
		box{<9.9,4.9,0.9>,<-9.9,-4.9,-0.9}
		texture{image_map{png"image.png"}}
		}
	box{<9.9,4.9,0.8>,<-9.9,-4.9,0.88>texture{pigment{rgb 1}finish{ambient 1 diffuse 0}}}
//"light" source
	}

In a "normal" scene it won't shed any light on nearby elements, but it will in a
radiosity scene.

Alain

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