[Radiance-general] Strange halo artifact in rendering

[Mark Stock]

That doesn't sit well with me. I do want the ambient calculation, but "-aa 
0" is supposed to turn caching off---or run a fresh new hemisphere 
sampling for every image pixel (assuming -ps 1). So why would it 
interpolate from some brighter ambient point in the dark area *under the 
frame* instead of probing outward for the incident light? Ambient 
resolution should have no part of that.

M

On Fri, 15 Mar 2013, Guglielmetti, Robert wrote:
>
>> I learned this morning that the halo is coming from the array of ceiling
>> lights and not the spotlight.
>
> That was pretty clear to me, in looking at the rendering. The multiple
> edges evident particularly from the bottom of the frame are the giveaway.
> You are using Radiance light objects, and these always give these
> exceedingly (unbelievably) sharp edges to the pools of light that they
> cast. Radiance lights based on a photometry file tend to have softer
> edges, even those based on directional lamps.
>
> Jack's trick worked because even tho you have -aa at zero, you have -ab 2
> which will still cause the ambient calculation to be run; the increased
> -ar has the effect of softening the halo, I think. -aa 0 simply turns off
> interpolation, not the ambient calculation altogether.
>
> I think.
>
> - Rob
>
>
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