RedHat is a shaderpack that works for both Iris and Optifine. It is an edit of an old version of Chocapic13, and has many features.
RedHat's main features are lighting effects such as Godrays (3D, or 2D, if you have a low-end machine), Shadows, Underwater Light Absorption, and many more.
The shaderpack features reflections too, and reflects some light on all surfaces, to make everything look more similar to the Minecraft trailers style.
There are many cinematic options such as Lens Flares, Depth of Field (Chromatic Aberration included), Grain, Tilt Shift, and others.
Then there are the colors, which change depending on the time, making everything more realistic yet keep the fantasy feeling at the same time.
There are many effects related to movement as well. All foliage or hanging things wave (such lanterns when they are hanging), and there are Waving Hand and Waving Camera options too, configurable as well.
If that wasn't enough, RedHat supports all versions from 1.7.2 up to 1.19 and 1.18.2, and it supports all custom skies of texture packs! And it also supports vanilla minecraft clouds, if you don't appreciate the modified Chocapic clouds!
Lastly, there are many atmospherics effects such as Fog and Clouds, Round moon and sun, and other things like PBR support, Auto-Exposure, Stars, and many, many other things.
There are a lot of ways you can customize your shaderpack, and make it look like the way you want, and you can do all of that through the settings menu!
GPU: Must support OpenGL 3.2 and have at least 1GB of VRAM. AMD, NVIDIA and Intel are all supported (You'll have to decrease some settings to play smoothly with Intel GPUs).
CPU: Must have a minimum clock speed of 1GHz
RAM: You must have located at least 2GB of RAM to your game
OS: Windows (7,8, 8.1, 10, 11), Linux (Mesa drivers might lead to issues)
Shadermod: Optifine or Iris (Iris may have some issues)
MC Version: 1.7.2, up to 1.19.3
If you use RedHat without meeting these requirements, then keep in mind you'll take a risk. RedHat is a pretty heavy shaderpack, thus do not expect it to be FPS friendly, even if you select the fastest profile in the shaderpack.
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