Exponential Height Fog – how to brighten it without Direct Inscattering?

Development Rendering
1

Hi,

I was building this test scene for an upcoming project and encountered a few problems:

  1. There’s a distinct border in the Exponential Height Fog where the Direct Inscattering influence ends (see pic. 1) and there seems to be no way to make it smooth it more;
  2. When you turn off Direct Inscattering to eliminate the border – you get a very dark fog (see pic 2). And even if it’s 100% white it still is rather “muddy” and grey (see pic. 3).

I need the fog to be brighter for the impression of an early morning with an almost white (with a slight golden tint) thick fog floating above the river and the valley, but I’ve failed to achieve such an effect with the curren fog system in UE4. So any help is much appreciated :slight_smile:

Pic. 1 68c72fdf71e4fe57f0099546601e6d694238327a.jpeg
Pic. 2 103ada3f9e013400d744fcbc9c25cc1bbbbfe25c.jpeg
Pic. 3

UE4_ExpHightFog_TooDark.jpg
UE4_ExpHightFog_TooDark.jpg1920×1080 330 KB

2

You should be able to increase the brightness of the fog further by increasing the “V” value in the fog color to 2 or 3, which will multiply the RGB values and effectively allow you to go above 100% white. Hopefully that should give you the bright fog effect you’re after.

3

Yep, the fog now looks closer to what I’m aming for. I’ve already bumped all three values (RGB), but I was not shure if it’s Ok to use values above 1 in the fog color and brightness. Thanks for your reply.