OTOY Forums

Hi guys,

I have a scene which I lit with a Sunlight + HDRI (Mix Texture)

15000 samples with DL, Ray
Path Term: 0.15
Coherent Ratio: .5

I'm getting alot of noise on the darker area of the scene. Can anyone help me with it.

Hi,
Use PT. Increase caustic blur, lower diffuse/spec depths and watch this video. https://youtu.be/HCrybjkcVtY

Thanks aoktar for the reply.
I tried what you mentioned, but still no luck with it. I'm attaching the scene if you have time please can you have a look at it. Much appreciated in advance.

Hi ansarwasif,
I had a look at your scene, and in my opinion, the most of the noise comes from the weak HDR used in conjunction with the physical sun, infact you have two suns working in the same scene. The HDR has low resolution and low dynamic. So, if you rise the gamma from 1 to 2.2 to get the shadows, then you are going to introduce a lot of noise. You would try to change the HDR with one downloaded from this site:
http://noemotionhdrs.net/hdrday.html
or use an emitter to simulate the secondary sun
ciao beppe

bepeg4d wrote:Hi ansarwasif,
I had a look at your scene, and in my opinion, the most of the noise comes from the weak HDR used in conjunction with the physical sun, infact you have two suns working in the same scene. The HDR has low resolution and low dynamic. So, if you rise the gamma from 1 to 2.2 to get the shadows, then you are going to introduce a lot of noise. You would try to change the HDR with one downloaded from this site:
http://noemotionhdrs.net/hdrday.html
or use an emitter to simulate the secondary sun
ciao beppe

Thanks alot beppe. I will try the HDRI. did not think of HDR could introduce grain.