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Noisy background

Posted: Wed 2 Aug 2017 17:32
by Nenius
Hello you all
I´m having problems with the grass shader. I share my setting and the example. I don´t know how to fix it. Anyone can help please?
I don´t like the grass, is too noisy. I tested with many different grasses, always the same.
Thanks!!!

Re: Noisy background

Posted: Fri 22 Sep 2017 11:00
by CamilleSarrut
Hello,
Did you try increasing the size of the grass shader ?

Re: Noisy background

Posted: Fri 22 Sep 2017 13:33
by Nenius
Hello Camille
I´ve also tried increseasing 2 and 4 times the size. But I don´t see a substantial difference.
What do you think?

Re: Noisy background

Posted: Fri 22 Sep 2017 17:27
by CamilleSarrut
Hello again,

Are you using HDRI lighting ?
Because that might cause the problem.
If you use HDRI, you need to use Exposure 1, check Enhanced background, set light sampling to 5 and check Automatic white balance.
Hopefully this should help removing the noisy effect on the grass shader 8-)

This is what I've done for this image:
HDRI_light_sampling-5_enhancedBG.jpg
HDRI_light_sampling-5_enhancedBG.jpg (132.69 KiB) Viewed 5848 times

Settings:
HDRI_settings.png
HDRI_settings.png (72.44 KiB) Viewed 5848 times

Re: Noisy background

Posted: Sun 24 Sep 2017 23:16
by Nenius
Hello Camille
It´s not better. I tried the same settings as you recommended me, and similar setting without HDR.

Re: Noisy background

Posted: Sun 24 Sep 2017 23:17
by Nenius
this image was missing, is the one your recommended me

Re: Noisy background

Posted: Tue 26 Sep 2017 09:00
by CamilleSarrut
Hello,

With the recommended setting the grass is a little less noisy. I'm not sure we can make it better... sorry
I can ask Stephane Desmulie when he comes back from vacation next week.

But the image is too bright, maybe change the lighting power of your HDR.

Best regards,

Re: Noisy background

Posted: Tue 26 Sep 2017 11:39
by Nenius
Ok, perhaps she has any idea. Please, let me know. Thanks and
Regards

Re: Noisy background

Posted: Tue 10 Oct 2017 08:55
by CamilleSarrut
Hello,

Stephane told be the noise might come from the bump value of the grass shader. Have you added some bump on the grass shader ?

Best regards,

Re: Noisy background

Posted: Thu 12 Oct 2017 14:04
by Nenius
Hello.
There´s no bump added. But It seems the images looks better, what do you think? I attach them with the Camille advice settings, and another with similar settings