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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