In the image "test A" I've setted the IES to 100 samples, and rendering the scene at 3500 pixel, pathtracing, 8000 samples.
Caustic blur/path term./coherent ratio= 0,35
with a rendering time of 6h15 min as you can see I've again a lot of noise
In the image "test B" I've setted the IES to 10000 samples, and rendering the scene at 3500 pixel, pathtracing, 8000 samples.
Caustic blur/path term./coherent ratio= 0,35
with a rendering time of 6h13 min (equal than the previous test) I've finally a clean image.
I've noticed that:
- raising the IES samples from 100 to 10000 not affect the render time. Can someone explain me how these samples works?
- the other light in the scene (sampled with a value of 100 and with 0 opacity) have at the end lower luminosity that the prevoious test. Again someone could explain me why?
Again I've made another test giving double resolution and half samples to the image (7000 pixel and 4000 samples) but I've noticed again noise with almost double rendering time (11h 40).
The last test (test D) was made in PMC, same resolution than test C, but with only 1500 samples with a rendering time of about 10h30 having a better results in therm of noises than the previous test, with a lower rendering time.
Summarizingthe better option for my opinion is to go with solution B or D prefering this one also with a rendering time a little bit higher, but with double resolution.