|
 |
On 09/25/2017 04:38 AM, Mr wrote:
> William F Pokorny <ano### [at] anonymous org> wrote:
>> On 09/23/2017 08:19 AM, Ive wrote:
>>>
>>> From what I can tell, especially aimed at architectural
>>> pre-visualisation,
>>
>> So these could likely be a little sloppy. Good to know.
>
> two open source available implementations:
> http://www.luxrender.net/wiki/LuxRender_Lighting#IES_data
>
> If in doubt, a good compromise to not go as far as full IES support is also to
> look at Blender's custom curves light attenuation where a spline commands the
> blending of a spotlight from center to edge of cone:
>
>
https://docs.blender.org/manual/ja/dev/render/blender_render/lighting/lights/light_attenuation.html#custom-curve
>
>
>
Thanks for these references.
Starting with the Blender reference, you can accomplish the custom
curves sort of thing - and more - already in POV-Ray though in a less
pre-packaged way. See the attached 3.8 scene for a quick example.
On the luxrender reference.
- So the LuxRender code itself is open source with a license compatible
with POV-Ray's AGPLv3 license?
- Assuming a little about how the luxrender mesh light sources actually
work and seeing their warning regarding IES light intensity corruption
due them... One advantage of having some enclosing shape for
non-spherical lights while handing the spherical IES light profile is
that it gives you an adjustable transmission channel over the surface of
the shape which can compensate for less-than-correct IES fading for
non-point/centered source lights. Though, I have to think with some
work, the same sort of adjustments/compensations could be part of any
mesh light implementation using IES profiles and it more a matter it has
not yet been done.
Bill P.
Post a reply to this message
Attachments:
Download 'utf-8' (2 KB)
|
|
