Installation guide to install Optimum Realism on Minecraft Java Edition with compatible shaders:-

Prerequisites:-

Optifine

Minecraft Java Edition(1.15+)

Java

Winrar

Most people have Java already installed on their computers, you can check if Java is installed on your PC by searching for Java on the search bar on Windows and it should show up. If you do not have it, you can go here and download it.

Optifine is an fps boost mod and this mod supports shaders, which Optimum Realism uses. You can download it from here. Once downloaded, simply click on the jar file, this jar file should be clickable if Java was installed properly on your PC. Next, install it, and it may tell you to run Minecraft once so it could detect it and install itself.

Most shaders and resource packs come in archived forms, and this is mostly not a problem. For some of them, they require you to extract them. Optimum Realism does not require you to extract any files, however, it may in the future. You can download it here.

You need to run Optimum Realism with supported shaders to enjoy it at its maximum potential. Shaders like SEUS PTGI and Kappa are recommended, if you do not have a device that can run them at decent fps, you can opt to use a more lightweight shader such as BSL, but it may not have the best quality when compared to other shaders. Once you install it, simply cut it, then press cntrl + r, and type %appdata%, this will lead you to your roaming app data folder. Click on .minecraft and then paste it in a folder called "shaderpacks" if there's no folder like that, create one.

Next, install Optimum Realism from either Gumroad or Patreon, or the demo versions from PlanetMinecraft or Curseforge. . Most shaders that are either updated recently or are new overall usually have LabPBR as their default format.

Now as mentioned before, again press win+ r and type %appdata% this time go to the resource packs folder and paste Optimum Realism there.

Now, open Minecraft and go to video settings>resourcepacks and select Optimum Realism and load. Then, go to video settings>shaderpacks and load the shader you installed now. You've been provided with a graphical guide as well as the best settings for the Kappa Shader and SEUS PTGI HRR 2.1/3 below, however, you're not limited to these settings, you can experiment with them on your own depending upon the quality you want and the fps you'd like to have. You could also increase the sample rate to 256 to gain the best quality possible. (Change the texture resolution based on the resolution you downloaded on SEUS PTGI HRR 2.1/3)

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Installation guide to install Optimum Realism on Minecraft Java Edition with compatible shaders:-

Prerequisites:-

Iris

Fabric

Minecraft Java Edition(1.16+)

Java

Winrar

The Iris shader mod doesn’t contain all the features which Optifine contains that are required to play Optimum Realism by itself and depends on other mods to fulfil those features, as a result, you need to download additional mods which may or may not be updated to the latest Minecraft version. While Iris is more open and updated more often, it is comparatively harder to install when you want to install the Optifine alternative mods as well, as a result this is not recommended if you're new to modding Minecraft in general. If you don't mind spending some time on installation, and want more customization, and an overall more open and updated shaders mod - Iris is your way to go.

Most people have Java already installed on their computers, you can check if Java is installed on your PC by searching for Java on the search bar on Windows and it should show up. If you do not have it, you can go here and download it.

Iris is a mod that makes shaders have support on Minecraft, shaders which Optimum Realism requires as it is a POM & PBR resource pack.

Fabric is a launcher that Iris currently supports, in order to play Optimum Realism with iris, you need to download the fabric launcher. You can go here and download it. Click on download universal jar and then open it, click on the latest launcher version and the current Minecraft version you want to download it for. You can also install some other mods with Iris to obtain more fps. Please make sure to match the versions correctly.

These mods are required for Optimum Realism to run properly with Iris/Fabric

Iris

Sodium

Polytone

Continuity

Entity Model Features

Entity Texture Features

Alternatively, you can also use the fabulously optimized modpack or find alternatives yourself here.

Most shaders and resource packs come in archived forms, and this is mostly not a problem. For some of them, they require you to extract them. Optimum Realism does not require you to extract any files, however, it may in the future. You can download it here.

You need to run Optimum Realism with supported shaders to enjoy it at its maximum potential. Shaders like SEUS PTGI and Kappa are recommended, if you do not have a device that can run them at decent fps, you can opt to use a more lightweight shader such as BSL, but it may not have the best quality when compared to other shaders. Once you install it, simply cut it, then press windows + r, and type %appdata%, this will lead you to your roaming app data folder. Click on .minecraft and then paste it in a folder called "shaderpacks" if there's no folder like that, create one.

Next, install Optimum Realism from either Gumroad or Patreon, or the demo versions from PlanetMinecraft or Curseforge. There are two variants available for the Java Edition version of Optimum Realism, LabPBR and OldPBR. Most shaders that or either updated recently or are new overall usually have LabPBR as their default format. OldPBR as the name suggests was an older PBR format that is still used by some popular shaders like Sonic Ether's Unbelievable Shaders and so on.

Now as mentioned before, again press win+ r and type %appdata% this time go to the resource packs folder and paste Optimum Realism there.

Now, open Minecraft and go to video settings>resourcepacks and select Optimum Realism and load. Then, go to video settings>shaderpacks and load the shader you installed now. You've been provided with a graphical guide as well as the best settings for the Kappa Shader and SEUS PTGI HRR 2.1/3 below(refer to Minecraft Java Edition Optifine installation images above), however, you're not limited to these settings, you can experiment with them on your own depending upon the quality you want and the fps you'd like to have. You could also increase the sample rate to 256 to gain the best quality possible. (Change the texture resolution based on the resolution you downloaded on SEUS PTGI HRR 2.1/3)

Installation guide to install Optimum Realism on Minecraft Windows 10 Edition with RTX On.

Prerequisites:-

Minecraft Windows 10 Edition(Renderdragon Engine)

RTX compatible card

Simply, download the Optimum Realism Bedrock RTX version from Gumroad or Patreon. Then click it, and it should open Minecraft Windows 10 Edition. Go to settings and enable RTX, make sure you've an RTX enabled graphics card for it to work. Next it is recommended but not required to download the BetterRTX mod, which you can download from here. Once installed, just hit play and enjoy. Remember, Optimum Realism is partially supported on Minecraft Bedrock Edition and so many blocks are not on the Bedrock RTX version, and some features cannot be transferred to Minecraft Bedrock due to technical limitations, however we have made multiple efforts to make the experience as enjoyable as problem.