Corona light with directionality=1.0 - Noisy render

Corona Corona for 3ds Max Issues
1

Hello to everyone, please exuse me if this is not a bug, but anyway it look weird to me.
I have this easy scene, with 3 CoronaLights: one of this lights is setted with directionality=1.0
Other general settings are defaults. Tested with alpha 5 and alpha 6 (the image below is from alpha 6).

test_noise.jpg
test_noise.jpg640×480 74.2 KB

As you can see, is very noisy where the light is casting (also in the reflections). The noise increase directly proportional to the directionality value.

test_noise_detail.jpg
test_noise_detail.jpg640×480 69.8 KB

It converge to a decent solution only after ALOT of passes. High “Light samples multiplier” value does not help (now is 16 )
In attachment you can download the scene (3dsm 2014) if you’d like to give a try.
corona_arealight_test_01.7z (24.1 KB)

2

light normals,I think…

add setting image,you can see different

无标题1.jpg
无标题1.jpg1138×439 36.1 KB

3

I was download and tested,use 0.65 and get this image…

1.jpg
1.jpg640×480 36.6 KB

5

Ok, thanks.
Actually it is a “projector simulation” and with the new circular shape would be a spot light simulation: I know that with the new alpha 6 we can use 3dsm standard light for that, but of course the final resaults are different fotometrically speaking.
Do you know if there are plans to fix this?

6

yep, I will try to fix it.

7

Great! And really congratulation (to all of you) for this great software, from the installation to the size, is a piece of art.

8

added to the list of known problems http://forum.corona-renderer.com/ Known bugs/limitations #msg543