Am 05.12.2016 um 17:14 schrieb omniverse:

> A test of 2 spheres, rgb 1 and rgb 0 both with emission -1, caused only a
> darkened area for the white (now black) sphere on a white plane.
> Black sphere with emission -1 made no change to the white plane below it.
> 
> I take from this that color > 0 is required for emission to do anything. This in
> turn makes me think there should be some way to get a black or dark object to
> enhance the darkness around it.

Try positive emission with a negative pigment ;)

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clipka <ano### [at] anonymousorg> wrote:


> > I take from this that color > 0 is required for emission to do anything.

I'd predict that based on 0 * -1 = 0.

> This in
> > turn makes me think there should be some way to get a black or dark object to
> > enhance the darkness around it.

Have it run for public office.  ;)  :D

> Try positive emission with a negative pigment ;)

:O  You'll blow something up for sure!

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clipka <ano### [at] anonymousorg> wrote:
> Am 05.12.2016 um 17:14 schrieb omniverse:
>
> > A test of 2 spheres, rgb 1 and rgb 0 both with emission -1, caused only a
> > darkened area for the white (now black) sphere on a white plane.
> > Black sphere with emission -1 made no change to the white plane below it.
> >
> > I take from this that color > 0 is required for emission to do anything. This in
> > turn makes me think there should be some way to get a black or dark object to
> > enhance the darkness around it.
>
> Try positive emission with a negative pigment ;)

Except that wouldn't allow for a dark, yet positive value, color to likewise
darken its surroundings.

Of course, the more I think it over I don't know how much this would be
deviating from real world. Something I haven't checked into.

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"Bald Eagle" <cre### [at] netscapenet> wrote:
> clipka <ano### [at] anonymousorg> wrote:
>
>
> > > I take from this that color > 0 is required for emission to do anything.
>
> I'd predict that based on 0 * -1 = 0.
>
> > This in
> > > turn makes me think there should be some way to get a black or dark object to
> > > enhance the darkness around it.
>
> Have it run for public office.  ;)  :D
>
> > Try positive emission with a negative pigment ;)
>
> :O  You'll blow something up for sure!

LOL Heck, I haven't had anything to do with politics since turning 18 years old
a few days before a presidential election. The only time (almost) I was ever
compelled to vote.

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Am 05.12.2016 um 19:43 schrieb omniverse:
> clipka <ano### [at] anonymousorg> wrote:
>> Am 05.12.2016 um 17:14 schrieb omniverse:
>>
>>> A test of 2 spheres, rgb 1 and rgb 0 both with emission -1, caused only a
>>> darkened area for the white (now black) sphere on a white plane.
>>> Black sphere with emission -1 made no change to the white plane below it.
>>>
>>> I take from this that color > 0 is required for emission to do anything. This in
>>> turn makes me think there should be some way to get a black or dark object to
>>> enhance the darkness around it.
>>
>> Try positive emission with a negative pigment ;)
> 
> Except that wouldn't allow for a dark, yet positive value, color to likewise
> darken its surroundings.

If that's what you absolutely positively need, there's always the option
to hide your proper object from radiosity using "no_radiosity", and
setting up a menacingly dark radiosity stunt double using "no_image
no_reflection no_shadow".


> Of course, the more I think it over I don't know how much this would be
> deviating from real world. Something I haven't checked into.

Emit darkness? Why, yes - I guess that may need /some/ degree of
deviating from real world :P

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clipka <ano### [at] anonymousorg> wrote:
> Am 05.12.2016 um 19:43 schrieb omniverse:
> > clipka <ano### [at] anonymousorg> wrote:
> >> Try positive emission with a negative pigment ;)
> >
> > Except that wouldn't allow for a dark, yet positive value, color to likewise
> > darken its surroundings.
>
> If that's what you absolutely positively need, there's always the option
> to hide your proper object from radiosity using "no_radiosity", and
> setting up a menacingly dark radiosity stunt double using "no_image
> no_reflection no_shadow".
>
>
> > Of course, the more I think it over I don't know how much this would be
> > deviating from real world. Something I haven't checked into.
>
> Emit darkness? Why, yes - I guess that may need /some/ degree of
> deviating from real world :P

heh-heh-heh! Mmmm. Perhaps, perhaps. Did think about a stunt double thing,
although I would probably be the one doing the stunts trying to get that right.

Bob

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