[Bf-cycles] Zero-Angled Spotlight?

[Mohamed Sakr]

well I guess the best is: the light got a node already "Light Falloff node"
, which can represent strength by a texture for objects, here you can also
add 1 more input for the cone angle "and it should be used within sampling,
instead of the full hemisphere sampling, I expect you would use the spot
light cone sampling function here" , this will be totally dynamic with all
infinite capabilities.


On Wed, Sep 2, 2015 at 10:18 AM, Sergey Sharybin <sergey.vfx at gmail.com>
wrote:

> I'm not sure what exactly spread angle means in this context, you already
> have it for spot lights and adding spread angle to spot and sun lights is
> somewhat malformed.
>
> What we can do instead is either of:
>
> - Modify energy function of area light, so it only contributes light
> inside of a beam defined by it's area. Should be quite quick hack, but
> would require some tweaks to PDF to make MIS working correct. Also circular
> lasers can not be supported by this. This seems exactly what Lux does
> (maybe internally they actually switching from rectangle to circle tho).
> - Make spot light's source non-zero. Effectively making it to shoot
> cylinder instead of a cone.
>
> We can also go totally crazy ans support Laser option for any object, so
> even meshes with emission shader can be acting as lasers, making it
> possible to use laser beam of arbitrary shape.
>
> On Wed, Sep 2, 2015 at 12:56 PM, Mohamed Sakr <3dsakr at gmail.com> wrote:
>
>> Hey Sergey,
>>
>> I guess we can add a spread angle parameter to lights? "hemisphere cone"
>>
>> On Tue, Sep 1, 2015 at 5:03 PM, Constantin Rahn <conz at vrchannel.de>
>> wrote:
>>
>>>
>>> It's not possible with cycles, but it's available in Luxrender 1.4+ and
>>> an area light with "laser on".
>>> http://www.luxrender.net/forum/viewtopic.php?f=16&t=11572
>>>
>>> http://www.luxrender.net/forum/viewtopic.php?f=12&t=11533
>>> "- add constantinfinite, laser lights"
>>>
>>> Sorry for pointing to other FOS software in the cycles ML. ;)
>>>
>>>
>>> Am 01.09.2015 um 16:51 schrieb Zauber Paracelsus:
>>> > The problem with that, however, is that the laser would be visible when
>>> > it is not passing through the mist as well.
>>> >
>>> >
>>> >
>>> > On 09/01/2015 10:48 AM, Mohamed Sakr wrote:
>>> >> actually this is not possible with lights, your only solution is a
>>> >> cylinder object "acting as your laser light" , and put an emission
>>> >> node in the volume output "leave surface empty"
>>> >>
>>> >> On Tue, Sep 1, 2015 at 4:42 PM, Zauber Paracelsus <
>>> zauber at gridmail.org
>>> >> <mailto:zauber at gridmail.org>> wrote:
>>> >>
>>> >>     Would it be possible to change the minimum angle width of a
>>> spotlight
>>> >>     from one degree to zero?  I was tinkering with a scene filled with
>>> >>     mist,
>>> >>     and wanted to create the effect of laser lights transmitting
>>> through
>>> >>     mist, which would scatter their light and make the beam visible.
>>> The
>>> >>     closest light I could think of that would produce the effect was a
>>> >>     spotlight, but due to its minimum angle width of 1 degree, I am
>>> >>     not sure
>>> >>     if I can accomplish the effect.
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>>> >>
>>> >>
>>> >>
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>>
>>
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>
>
> --
> With best regards, Sergey Sharybin
>
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