On 15-3-2019 9:35, Thomas de Groot wrote:
> On 14-3-2019 13:28, Thomas de Groot wrote:
>> On 14-3-2019 8:43, Thomas de Groot wrote:
>>> The small issue I was talking about is the thin line of light visible 
>>> between the glass/lead and the window frame. It could be the window 
>>> being a tiny bit too small but I guess it is light "leaking" at 
>>> angles. Something similar is shown at the angle between floor and 
>>> wall. I dimly remember this phenomenon was discussed many years ago 
>>> and I do not remember the way to correct that, except, I believe, by 
>>> using stochastic anti-aliasing. I shall test that in any case.
>>>
>>
>> As I supposed indeed, stochastic antialiasing (with no_cache) solves 
>> the issue.
>>
> 
> The downside of this is that combining stochastic aa with photons, will 
> dramatically decrease render speed. A rough calculation for the image 
> above, with a crude setting of aa (+a0.1) and with photons enabled, 
> shows that it will take at least 24 hours to render. :-(
> 

Not precise enough I am afraid. I need to give you more relevant info:

+ The issue mentioned above was solved using UberPOV, without photons, 
and with no_cache on in the radiosity block. Command line: +w640 +h640 
+am3 +a0.01 +ac0.995 +r3 +bm2 +bs8 +wt6. Radiosity's count was lowered 
to 10. Render time seemed acceptably "low" (I didn't render a complete 
image).

+ The same settings using UberPOV, this time with photons on, the render 
time soared up to the estimate of 24 hours+.

+ Using the latest version of 3.8, and with identical settings for +am3 
on the command line (no_cache is /not/ available in this version), both 
with or without photons available, the render time was "low" i.e. 
acceptable for a test and within the hour. However, the issue mentioned 
above was *not* solved. I tried to increase dramatically the count value 
in the radiosity block but to no avail where the issue was concerned.

I would like some expert's view on the matter please.

-- 
Thomas

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