Dave VanHorn nous illumina en ce 2008-10-28 10:44 -->
> "Bob Hughes" <omniverse charter net> wrote:
>> "Dave VanHorn" <mic### [at] gmailcom> wrote in message
>> news:web.49063d6478db427ea08ed15e0@news.povray.org...
>>> The cylinder object gives me a nice looking fire, (complicated)
>>> and the chalice object is fine, but the light sources which should be up
>>> in the
>>> fire object, don't seem to get OUT.
>>
>> Hmmmm. You don't show what your Flame is made of, such as filtered pigment
>> or media, but I'm not sure why you aren't seeing any light from the fire. I
>> ran a render of what you are trying using my own fire material and other
>> than no_shadow preventing shadowing from the fire cylinder I can see the
>> light source.
> 
> It's a complicated thing, but it's not causing the lights not to get out.
> 
> 
>> Your area_light isn't what I've ever used or recall seeing used, having no
>> perpendicular axis to make the grid of lights. And yet that doesn't seem to
>> be the actual problem you are getting there, if mine rendered the same here.
> 
> The docs say you can make it a linear light by doing X1 in one axis.
If you make a linear area_light, then you can't use orient. Your's have 2 
parallel axis.
The first two value are the extent of the area_light, the next two are the 
number of elements along each axis.
Apparently, you want it to be vertical, long and thin. So:
<0.1,0,0><0,2,0> for the dimentions and
3,33 for the elements
then add "jitter" to soften the shadow even more.
With adaptive, 9, 17, 33, 65,... are effecient values. 8 is not an effecient value.
> 
>> Just to be sure, I changed it to be <1,0,0>,<0,2,0>,5,10 so I could see
>> everything else wasn't wrong in some way.
>> Something to keep in mind about area_light is how it is still like a point
>> source when it comes to location and other things unrelated to the shadowing
>> it causes. So other than shadows it is like a regular point of light.
> 
> Right.. I'm seeing light from it now, but I'm not seeing the softened shadows,
> which I should be..

> 
>> Also not knowing your Chalice object means it is possible a surface is
>> obscuring the light. There might be a clue by how your fire object has a
>> bottom slightly above the light_source, perhaps meaning your Chalice has a
>> surface at the same place? So remember area_light remains a point-like
>> source based on its location and not the grid being created.
> 
> It should be, but not completely.  That's what I intend.
> I thought I'd outsmart it and use a "looks like" to find out where the lights
> are, but that just gives one sphere no matter how many lights I specify.
> 

-- 
Alain
-------------------------------------------------
   I knew a girl so ugly, they use her in prisons to cure sex Offenders.
   	Rodney Dangerfield

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