Get rid off fireflies in reflections?

V-Ray V-Ray for Cinema 4D General
1

I have a scene lit with an HDRI. Most of my objects have metal materials and on one of the materials I get very noticeable “fireflies”.

The material is set up as follows:
diffuse: 80% gray
reflection: 100%
metalness: 1
roughness: 0.3
fresnel: 1.03
max ref depth: 2
dim distance: 75cm
dim falloff: 0.8

render settings:
bucket
min: 1
max: 12
threshold: 0.02

There´s some noise on my other materials, but it doesn’t appear as “fireflies”.

I´ve tried lowering the max ray intensity, even to close to zero. The whole render gets darker but the fireflies remain.
Lowering the dim distance on the material helps, but I dont want to lose too much of the realism.
Lowering the roughness helps as well of course.

I´ve set the color space on the HDRI to “gamma corrected” and the gamma in the vraybitmap settings to 0.8 to get a little more contrast in the HDRI, mostly in the mid-levels.

My guess is the fireflies is caused by the bright areas of the HDRI being too bright? Is there a fix for this?

2

You can blur the bright area of the hdr a bit, I also recommend to try the Intel denoiser that is great in removing fireflies.

3

Thanks! I´ll trying blurring those areas.

Do you know of a way to lower the intensity of the brightest areas of the HDRI in photshop maybe?

I´ll try the denoiser as well. I have some brushed metals and also some textures with text. Do you think the denoiser would work without blurring those elements?

4

I think I solved it by manually reducing the intensity of the brightest parts of the image in photoshop.